{"id":3307,"date":"2025-10-13T11:30:51","date_gmt":"2025-10-13T03:30:51","guid":{"rendered":"https:\/\/www.chuxin-smt.com\/how-reflow-oven-temperature-profiles-impact-pcb-solder-quality\/"},"modified":"2025-10-13T11:30:51","modified_gmt":"2025-10-13T03:30:51","slug":"how-reflow-oven-temperature-profiles-impact-pcb-solder-quality","status":"publish","type":"post","link":"https:\/\/www.chuxin-smt.com\/hr\/how-reflow-oven-temperature-profiles-impact-pcb-solder-quality\/","title":{"rendered":"Kako profili temperature pe\u0107nice za reflow utje\u010du na kvalitetu lemljenja tiskanih plo\u010dica"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2025\/10\/1760326245-5dcc9028a0024ae29e7001c6f5516fca-scaled.jpg\" alt=\"How Reflow Oven Temperature Profiles Impact PCB Solder Quality\" class=\"wp-image-3305\" title=\"How Reflow Oven Temperature Profiles Impact PCB Solder Quality - S&amp;M Co.Ltd\" \/><\/figure>\n\n\n\n<p>Mo\u017eete u\u010diniti lemne spojeve na tiskanim plo\u010dicama \u010dvrstim i pouzdanim koriste\u0107i odgovaraju\u0107e profile temperature reflow pe\u0107nice. Dobra kontrola temperature poma\u017ee vam sprije\u010diti uobi\u010dajene probleme pri lemljenju. Ako profil pravilno postavite, imate manje rizika.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.smtfactory.com\/why-your-reflow-oven-may-be-causing-soldering-defects\">Oko 30% problema pri lemljenju<\/a> u elektronici se doga\u0111aju zbog pogre\u0161nih temperaturnih profila ili lo\u0161ih materijala.<br\/>Ovaj \u010dlanak nudi jednostavne savjete koji \u0107e vam pomo\u0107i da odr\u017eite \u010dvrste i pouzdane lemne spojeve.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >Klju\u010dne poruke<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Odaberi <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/he\/reflow-ovens\/\" rel=\"noopener\">ispravan profil temperature pe\u0107nice za reflow<\/a> za izradu \u010dvrstih lemnih spojeva.<\/p><\/li><li><p>Pratite koliko brzo se pe\u0107nica zagrijava i hladi kako biste smanjili stres i sprije\u010dili probleme.<\/p><\/li><li><p>\u010cesto provjeravajte pe\u0107nicu kako biste odr\u017eali pravu temperaturu i izbjegli pogre\u0161ke.<\/p><\/li><li><p>Koristite temperaturni profil koji odgovara va\u0161oj tiskanoj plo\u010dici i pasti za lemljenje za najbolje rezultate.<\/p><\/li><li><p>Pazite na svaku temperaturnu zonu u pe\u0107nici kako biste <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/hr\/how-to-reduce-voids-in-reflow-soldering-process-tips\/\" rel=\"noopener\">bolje lemiti i imati manje problema<\/a>.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" >Utjecaj na kvalitetu lemljenja<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >Za\u0161to je profiliranje va\u017eno<\/h3>\n\n\n\n<p>Postavljanje pravog profila temperature pe\u0107nice za reflow poma\u017ee vam posti\u0107i dobre lemne spojeve. Termi\u010dko profiliranje sprje\u010dava uobi\u010dajene probleme i pobolj\u0161ava rad elektronike. Morate pratiti koliko brzo temperatura raste, koliko dugo traje zagrijavanje i koliko brzo se plo\u010dica hladi. Ova pa\u017eljiva metoda ravnomjerno zagrijava tiskanu plo\u010dicu i smanjuje toplinski stres.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.protoexpress.com\/blog\/thermal-profiling-pcb-assembly-unsung-hero\/\">Termoprofiling je potreban za \u010dvrste lemne spojeve.<\/a><\/p><\/li><li><p>Kori\u0161tenje ispravnog profila zaustavljanja <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/id\/improve-wave-soldering-quality-5-effective-methods\/\" rel=\"noopener\">problemi sa lemljenjem<\/a>.<\/p><\/li><li><p>Dobra kontrola temperature \u010dini elektroniku pouzdanijom.<\/p><\/li><li><p>Kontrolom poja\u010davanja temperature, odle\u017eavanja i hla\u0111enja posti\u017ee se ravnomjerno zagrijavanje.<\/p><\/li><li><p>Manji toplinski stres zna\u010di manje o\u0161te\u0107enih dijelova.<\/p><\/li>\n<\/ul>\n\n\n\n<p>Ako <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/ar\/slug-optimizing-reflow-conveyor-speed-for-solder-joint-quality\/\" rel=\"noopener\">Profil temperature pe\u0107nice za reflow<\/a> Ako je temperatura pregrijavanja previsoka ili preniska, mo\u017eete imati mnogo problema. U donjoj tablici navedeni su uobi\u010dajeni nedostaci pri lemljenju, njihovi uzroci i na\u010dini ispravljanja:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Kvar pri lemljenju<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Uzrok<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Predlo\u017eeno djelovanje<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Puknuti SMD kondenzator<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Stopa grijanja postavljena previsoko; vlaga se \u0161iri unutar komponente<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u010cuvati u ormaru za vlagu, predpe\u0107i, smanjiti brzinu zagrijavanja<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Termalna komponenta o\u0161te\u0107ena<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Neispravan profil temperature tijekom reflow-a<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provjerite vr\u0161nu temperaturu i vrijeme iznad likusa.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Lemi kuglice oko SMD-ova<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Stopa grijanja je previsoka; prskanje fluksa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Smanjite brzinu zagrijavanja na najvi\u0161e 2 \u00b0C\/s<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Grape\u0107i<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Previ\u0161e topline tijekom predgrijavanja i natapanja; fluks je iscrpljen<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Smanjite vrijeme\/temperaturu tijekom predgrijavanja i natapanja<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Glavom u jastuku (HIP)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Prekomjerna toplina tijekom predgrijavanja i natapanja; oksidirane veze<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Smanjite vrijeme\/temperaturu, koristite du\u0161ik ili pastu za lemljenje ve\u0107e aktivnosti.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Niska temperatura refluksa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Nedovoljna temperatura tijekom reflow-a<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Pove\u0107ajte temperaturu i\/ili vrijeme u fazi reflow.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Puknuti lemni spoj<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lo\u0161a lemljivost, lo\u0161a pasta, neispravna brzina hla\u0111enja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provjerite lemljivost, kvalitetu paste i uskladite profil s podacima iz tehni\u010dke specifikacije.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Nedovoljno vla\u010denje kalaja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Zaga\u0111enje, lo\u0161a pasta, lo\u0161 profil<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provjerite stanje PCB-a\/komponenti, pastu i profil<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Nema stvaranja me\u0111umetalnih spojeva<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lo\u0161a lemljivost, lo\u0161a pasta, pogre\u0161an profil, nekompatibilni materijali<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provjerite lemljivost, kvalitetu paste, uskladite profil s podacima iz podatkovnog lista.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Uvijek postavite profil temperature reflow pe\u0107nice za svoju tiskanu plo\u010dicu i pastu za lemljenje. Ovaj korak poma\u017ee izbje\u0107i ve\u0107inu problema pri lemljenju.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Pouzdanost lemnih spojeva<\/h3>\n\n\n\n<p>\u017delite da lemni spojevi ostanu \u010dvrsti dugo vremena. Profil temperature pe\u0107nice za reflow utje\u010de na to koliko je svaki spoj \u010dvrst i pouzdan. Kori\u0161tenje pogre\u0161nog profila mo\u017ee uzrokovati probleme s termi\u010dkim ciklusima. Ti problemi \u010dine lemne spojeve slabima i skra\u0107uju im vijek trajanja. Termi\u010dki stres nastaje kada se materijali \u0161ire razli\u010ditim brzinama. To mo\u017ee uzrokovati pukotine i otkaze.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11123225\/\">Lo\u0161e profiliranje temperature uzrokuje probleme termi\u010dkog cikliranja.<\/a><\/p><\/li><li><p>Ako profili ne odgovaraju materijalima, termi\u010dki napon i deformacija rastu.<\/p><\/li><li><p>Intermetalni spojevi i promjene u kalaju mogu oslabiti spojeve.<\/p><\/li><li><p>Stope neuspjeha rastu kada ne kontrolirate temperaturni profil.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u201cOva studija ispituje kako lemni spojevi izdr\u017ee tijekom vremena. <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.academia.edu\/100768797\/A_study_of_the_thermomechanical_reliability_of_solder_joints_in_surface_mount_electronics_technology\">Lo\u0161i profili reflow-a mogu uzrokovati o\u0161te\u0107enja i u\u010diniti lemne spojeve manje pouzdanima.<\/a>&#8220;<\/p><\/blockquote>\n\n\n\n<p>Morate postaviti profil za svaki PCB. Broj slojeva, debljina bakra i raspored komponenti utje\u010du na kretanje topline. Ako ne provjerite profil prije izrade ve\u0107eg broja plo\u010da, riskirate hladne lemne spojeve, osobito ispod BGA komponenti. Mo\u017eete sprije\u010diti gubitke u proizvodnji provjerom toplinske provodljivosti, vrsta komponenti i gusto\u0107e rasporeda.<\/p>\n\n\n\n<p>Tablica u nastavku prikazuje \u0161to svaka temperaturna zona u pe\u0107i za taljenje lemljenja radi kako bi se stvorili \u010dvrsti lemni spojevi:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Zona<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Funkcija<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Zona predgrijavanja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Postupno podi\u017ee temperaturu kako bi sprije\u010dio toplinski \u0161ok; najbolja brzina je 1\u20133 \u00b0C u sekundi.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Zona natapanja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Odr\u017eava temperaturu konstantnom kako bi aktivirao fluks i osigurao ravnomjernu temperaturu po cijeloj plo\u010di.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Zona refluksa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Dosti\u017ee vr\u0161nu temperaturu (235 \u00b0C\u2013250 \u00b0C) za otapanje paste za lemljenje i stvaranje \u010dvrstih veza.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Zona hla\u0111enja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Brzo sni\u017eava temperaturu za stvrdnjavanje lemnih spojeva; kontrolirana brzina hla\u0111enja iznosi 2\u20134 \u00b0C u sekundi.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Napomena: Pajkanje zavara mo\u017eete u\u010diniti pouzdanijim provjerom profila temperature pe\u0107nice za reflow prije masovne proizvodnje.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >Temperaturne zone reflow pe\u0107nice<\/h2>\n\n\n\n<p>Mo\u017eete pobolj\u0161ati lemljenje ako poznajete svaku zonu pe\u0107nice. Svaka zona obavlja va\u017ean zadatak. Ako pogre\u0161no postavite profil temperature taljne pe\u0107nice, mo\u017eete dobiti probleme poput oksidacije ili praznina. Ponekad spojevi ne zavr\u0161e ispravno. Morate uskladiti profil temperature s va\u0161om tiskanom plo\u010dom i pastom za lemljenje.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Predgrijavanje zone<\/h3>\n\n\n\n<p>Zona predgrijavanja je prvi korak. Ova zona polako zagrijava va\u0161 tiskani plo\u010dasti sklop. Poma\u017ee sprije\u010diti toplinski \u0161ok i pokrenuti rad fluksa. Ako zagrijavate prebrzo, otapalo fluksa isparava prebrzo. To mo\u017ee uzrokovati da kalaj ne prianja dobro. Mo\u017eete vidjeti neujedna\u010dene kalajne spojeve.<\/p>\n\n\n\n<p>Ovdje je tablica koja prikazuje najbolju temperaturu i vrijeme predgrijavanja za olovno-slobodni lem:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Vrsta lemljenja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Raspon temperatura za prethodno zagrijavanje<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Trajanje predgrijavanja<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Bez olova<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.pcbonline.com\/blog\/pcb-lead-free-reflow-soldering.html\">150\u00b0C do 190\u00b0C<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>60 do 120 sekundi<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Olovni<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ne primjenjivo<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ne primjenjivo<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Zagrijavajte po 1 \u00b0C do 3 \u00b0C u sekundi.<\/p><\/li><li><p>Dr\u017eite vrijeme predgrijavanja izme\u0111u 60 i 120 sekundi.<\/p><\/li><li><p>Neka fluks djeluje i ukloni vlagu.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Ako zagrijavate prebrzo, gubite magnetski protok i dobivate lo\u0161e lemne spojeve.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Zona natapanja<\/h3>\n\n\n\n<p>Slijedi zona namakanja. Ova zona odr\u017eava temperaturu konstantnom. Flux zavr\u0161ava djelovanje i \u010disti metal. Cijeli PCB dobiva istu temperaturu. Ako je presko\u010dite ili ne postavite ispravno, mo\u017eete dobiti kuglice kalaja ili prskanje.<\/p>\n\n\n\n<p>Ovdje je tablica koja prikazuje temperaturu taljenja bezolovnog kalaja:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Vrsta lemljenja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Raspon temperatura namakanja<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Bez olova<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>150\u00b110\u00b0C<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Olovni<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ne primjenjivo<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Dr\u017eite toplinu na <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/wellmanxray.com\/blog\/what-are-the-temperature-zones-of-reflow-welding\/\">150\u00b0C do 180\u00b0C<\/a> od 60 do 120 sekundi.<\/p><\/li><li><p>Uklonite vlagu i druge tvari iz paste za lemljenje.<\/p><\/li><li><p>Zaustavite probleme poput kovanica i prskanja.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Napomena: Ako ne postavite zonu natapanja ispravno, mo\u017eete dobiti praznine ili lo\u0161e vla\u017eenje. Morate promijeniti vrijeme natapanja i temperaturu kako bi fluks djelovao i o\u010distio metal.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Zona refluksa<\/h3>\n\n\n\n<p>Zona taljenja je nakon namakanja. Ovdje se kalaj otopi i stvori \u010dvrste spojeve. Morate posti\u0107i pravu vr\u0161nu temperaturu i zadr\u017eati je kratko vrijeme. Ako je temperatura preniska, spojevi su hladni. Ako je previsoka ili traje predugo, spojevi postaju krhki i dijelovi se mogu slomiti.<\/p>\n\n\n\n<p>Ovdje je tablica koja prikazuje najbolju radnu temperaturu za kalaj s olovom i bezolovni kalaj:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Vrsta lemljenja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Tala\u010dka temperatura (\u00b0C)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Preporu\u010dena vr\u0161na temperatura (\u00b0C)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Posljedice prekora\u010denja temperature<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Na bazi olova (Sn63\/Pb37)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>~183<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>205\u2013220<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Previ\u0161e intermetalnih, krhkih spojeva, pregrijavanje<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Bez olova (SAC305)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>~217\u2013221<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>235\u2013250<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Djelomi\u010dno o\u0161te\u0107enje, previ\u0161e intermetalida, delaminacija<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Dr\u017eite toplinu iznad to\u010dke topljenja (<a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.fastturnpcbs.com\/guides\/reflow-soldering-profile\/\">217\u2013245 \u00b0C<\/a>) 30 do 90 sekundi.<\/p><\/li><li><p>Napravite intermetalne slojeve i dovr\u0161ite lemni spoj.<\/p><\/li><li><p>Nemojte predugo ostajati iznad to\u010dke topljenja, ina\u010de mo\u017eete o\u0161tetiti dijelove.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Upozorenje: Premalo zagrijavanje zna\u010di lo\u0161e vla\u017eenje. Previ\u0161e ili predugo zagrijavanje \u010dini spojeve krhkim i mo\u017ee pregrijati dijelove.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Zona hla\u0111enja<\/h3>\n\n\n\n<p>Zona hla\u0111enja je posljednja. Ova zona o\u010dvr\u0161\u0107uje lemne spojeve. Morate hladiti pravom brzinom kako biste sprije\u010dili pukotine i deformacije. Ako hladite prebrzo, dolazi do toplinskog \u0161oka. Ako hladite presporo, spojevi postaju krhki.<\/p>\n\n\n\n<p>Evo tablice koja prikazuje najbolju brzinu hla\u0111enja:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Stopa hla\u0111enja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>U\u010dinak na lemne spojeve<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.fastturnpcbs.com\/blog\/reflow-soldering-process\/\">2\u20134 \u00b0C\/s<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Najbolja brzina za zaustavljanje problema<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Prebrzo<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Mo\u017ee uzrokovati toplinski \u0161ok<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Prespor<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u010cini zglobove krhkim<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Hladite brzinom od 2\u00b0C do 4\u00b0C u sekundi.<\/p><\/li><li><p>Zaustavite toplinski \u0161ok i za\u0161titite dijelove.<\/p><\/li><li><p>Pobrinite se da se lemni spojevi o\u010dvrsnu na pravi na\u010din.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Dobro hla\u0111enje nakon reflow-a je vrlo va\u017eno. Time sprje\u010davate pukotine, delaminaciju i dodatni posao odr\u017eavaju\u0107i sustav hla\u0111enja u dobrom stanju.<\/p><\/blockquote>\n\n\n\n<p>Morate uskladiti svoj <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/hr\/set-reflow-oven-temperature-profile-for-better-soldering\/\" rel=\"noopener\">Profil temperature pe\u0107nice za reflow<\/a> na va\u0161 PCB i pastu za lemljenje. Razli\u010dite plo\u010de i paste zahtijevaju razli\u010dita pode\u0161avanja. Bolje lemljenje i manje problema posti\u017eete provjerom i pode\u0161avanjem svake zone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >Uobi\u010dajeni nedostaci lemljenja<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >Hladni spojevi<\/h3>\n\n\n\n<p>Hladni spojevi izgledaju be\u017eivotno i hrapavo. Lako pucaju pod optere\u0107enjem. Ako ne primijenite dovoljno topline, kalaj se ne otapa u potpunosti. To \u010dini spoj slabim. Sporo zagrijavanje u zonama predgrijavanja ili natapanja mo\u017ee uzrokovati hladne spojeve. \u010cak i mali pad temperature, poput 5 \u00b0C, mo\u017ee imati veliki utjecaj.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/aaloktronix.com\/understanding-cold-joints-in-pcb-soldering-causes-effects-and-remedies\/\">Nedovoljna toplina uzrokuje hladne spojeve<\/a>.<\/p><\/li><li><p>Niska temperatura ili kratko vrijeme zna\u010di da se kalaj ne tali.<\/p><\/li><li><p>Visoka temperatura mo\u017ee o\u0161tetiti dijelove, stoga je kontrola va\u017ena.<\/p><\/li><li><p>\u010cesto kalibrirajte svoju opremu kako biste odr\u017eali pravu temperaturu.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Provjerite profil temperature reflow pe\u0107nice prije nego \u0161to po\u010dnete. Dobra kontrola poma\u017ee pri protoku kalaja i stvara \u010dvrste spojeve.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Lemni \u010dvori\u0107i<\/h3>\n\n\n\n<p>Solder balling je pojava malih kuglica kalaja koje se formiraju u blizini komponenti. To se doga\u0111a ako zagrijavate prebrzo ili ako temperatura nije ravnomjerna. <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.lcsc.com\/blog\/understanding-solder-balls-how-to-prevent-quality-issues-in-reflow-soldering\/\">Brzo zagrijavanje mo\u017ee zarobiti stvari u kaloju za lemljenje.<\/a>. Ako je vrijeme predgrijavanja prekratko ili je temperatura preniska, lem se mo\u017eda ne\u0107e dobro zalijepiti.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Gre\u0161ka u temperaturnom profilu<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Opis<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Neadekvatan profil refluksa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.ltpcba.com\/reflow-soldering-temperature-zones-and-pcb-quality\/\">Nedovoljno vremena za predgrijavanje ili niske temperature<\/a> mo\u017ee sprije\u010diti spajanje kalaja, uzrokuju\u0107i stvaranje kuglica.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/mpe.researchmfg.com\/reflow-profile\/\">Brzo zagrijavanje uzrokuje neravnomjerno zagrijavanje<\/a> i mo\u017ee saviti tiskani plo\u010dasti sklop.<\/p><\/li><li><p>Rastvara\u010di se brzo isparavaju i stvaraju kvr\u017eice kalaja.<\/p><\/li><li><p>Zatvorene \u010destice u pasti tako\u0111er uzrokuju stvaranje grudica.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Napomena: <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/ro\/reflow-soldering-failures-troubleshooting-tips-pcb-quality\/\" rel=\"noopener\">Kontrolirajte brzinu zagrijavanja<\/a> Za sprje\u010davanje stvaranja kvr\u017eica kalaja. \u010cak i male promjene temperature mogu uzrokovati vi\u0161e nedostataka.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Premo\u0161\u0107ivanje<\/h3>\n\n\n\n<p>Mostovi nastaju kada kalaj spoji padove koji ne bi smjeli dodirivati. Kalaj se \u0161iri i povezuje dva mjesta. To je uzrokovano neujedna\u010denim zagrijavanjem i visokom temperaturom na vrhu. Ako se jedan pad zagrije br\u017ee, kalaj se pomakne i formira mostove. Brze promjene ili neujedna\u010dena temperatura naru\u0161avaju povr\u0161insku napetost i uzrokuju prekomjerno \u0161irenje kalaja.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Vrsta problema<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Opis<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Asimetri\u010dno grijanje<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lemna pasta na padovima se topi u razli\u010dito vrijeme, pa se lem pomi\u010de.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Visoka vr\u0161na temperatura<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Zagrijavanje iznad 245 \u00b0C za olovnu kalajnu spravu je previ\u0161e teku\u0107e i uzrokuje mostove.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Neravnomjerno zagrijavanje naru\u0161ava povr\u0161inski napon i \u0161iri lem.<\/p><\/li><li><p>Visoka temperatura \u010dini kalaj previ\u0161e teku\u0107im.<\/p><\/li><li><p>Upotrijebite dobar dizajn \u0161ablone i poku\u0161ajte s reflowom du\u0161ikom kako biste sprije\u010dili premo\u0161\u0107ivanje.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Tombstoning<\/h3>\n\n\n\n<p>Tombstoning je pojava kada se jedan kraj male komponente podigne. To uzrokuje da komponenta stoji uspravno. Doga\u0111a se kada se plo\u010dice zagrijavaju razli\u010ditim brzinama. Ako se na jednoj plo\u010dici kalaj prvi otopi, ona podi\u017ee komponentu. Brzo zagrijavanje u zoni predgrijavanja pogor\u0161ava situaciju. Tombstoning mo\u017eete sprije\u010diti polaganim zagrijavanjem i duljim odr\u017eavanjem temperature blizu to\u010dke topljenja.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.victorypcb.com\/news\/pcb-tombstone.html\">Razli\u010dita toplina podloga uzrokuje podizanje dijelova.<\/a>.<\/p><\/li><li><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.indium.com\/blog\/minimizing-tombstoning\/\">Neravne promjene topline mijenjaju sile vla\u017eenja.<\/a>.<\/p><\/li><li><p>Pa\u017eljivo predgrijavanje poma\u017ee sprije\u010diti tombstoning.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Upozorenje: Samo 5 \u00b0C razlike izme\u0111u podloga mo\u017ee uzrokovati tombstoning. Zadr\u017eite zagrijavanje ravnomjernim.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Poni\u0161tavanje<\/h3>\n\n\n\n<p>Praznine zna\u010de da se unutar lemnih spojeva stvaraju prazna mjesta. Ta slaba mjesta \u010dine spojeve manje \u010dvrstim. Neravnomjerno zagrijavanje ili nedovoljno dugo natapanje zarobljuju plin u kalaju. Ako ne kontrolirate temperaturu, nastaje vi\u0161e praznina. Male promjene temperature mogu uzrokovati vi\u0161e nedostataka.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lo\u0161a zona natapanja zadr\u017eava plin.<\/p><\/li><li><p>Neravnomjerno zagrijavanje stvara praznine.<\/p><\/li><li><p>Promijenite vrijeme natapanja i temperaturu za bolje spojeve.<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Pratite svoj temperaturni profil. \u010cak i male promjene mogu zna\u010dajno utjecati na kvalitetu lemljenja.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" >Optimizacija profila<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >Postavljanje i kalibracija<\/h3>\n\n\n\n<p>Mo\u017eete posti\u0107i dobre rezultate ako pravilno postavite pe\u0107 za reflow. Prvo, <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/hu\/set-reflow-oven-temperature-profile-for-better-soldering\/\" rel=\"noopener\">\u010cistiti pe\u0107nicu svaki tjedan<\/a> ili nakon velikih poslova. To uklanja fluktuacije i \u0161titi va\u0161e plo\u010de. Redovito provjeravajte dijelove za grijanje kako biste osigurali ravnomjerno zagrijavanje. Kalibrirajte senzore jednom mjese\u010dno za to\u010dna o\u010ditanja. Provjerite sustav transportnih traka kako va\u0161e plo\u010de ne bi bile o\u0161te\u0107ene. Dobar protok zraka je va\u017ean, stoga pazite na odzra\u010divanje i ventilacijske otvore.<\/p>\n\n\n\n<p>Evo jednostavne kontrolne liste za postavljanje i kalibraciju va\u0161e pe\u0107i:<\/p>\n\n\n\n<ol class=\"wp-block-list\" >\n<li><p>Polako podi\u017eite temperaturu u zoni rampe za 1\u20133 \u00b0C u sekundi.<\/p><\/li><li><p>Odr\u017eavajte zonu natapanja stabilnom za ravnomjernu toplinu, pokrivaju\u0107i polovicu pe\u0107nice.<\/p><\/li><li><p>Postignite najvi\u0161u temperaturu u zoni reflow-a i dr\u017eite plo\u010du iznad reflow-a 45\u201390 sekundi.<\/p><\/li><li><p>Kontrolirajte zonu hla\u0111enja brzinom od otprilike 4 \u00b0C u sekundi.<\/p><\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Savjet: Ako izra\u0111ujete mnogo plo\u010da, <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.circuitnet.com\/experts\/86671.html\">Provjeravajte profil temperature va\u0161e pe\u0107nice za reflow svaki tjedan.<\/a>. Za sitne poslove provjeravajte ga jednom mjese\u010dno ili nakon velikih promjena.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" >Razmatranja o PCB-u i pasti<\/h3>\n\n\n\n<p>Morate prilagoditi postavke pe\u0107nice PCB-u i pastu za lemljenje. Razli\u010dite vrste leme zahtijevaju razli\u010dito zagrijavanje odozgo. <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.allpcb.com\/allelectrohub\/a-guide-to-solder-reflow-ovens\">Kalaj bez olova najbolje radi na 235\u2013250 \u00b0C.<\/a>. Olovni kalaj zahtijeva 210\u2013230 \u00b0C. Fluks u pasti za kalaj po\u010dinje djelovati pri otprilike 100 \u00b0C. Poku\u0161ajte dosegnuti vrijeme iznad likvidusa (TAL) u roku od tri minute, osobito kod pasta koje se ne \u010diste. Ako prekora\u010dite to vrijeme, fluks mo\u017eda ne\u0107e dobro djelovati.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Vrsta lemljenja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Vrhunski temperaturni raspon (\u00b0C)<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Bez olova<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>235 &#8211; 250<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Olovni<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>210 &#8211; 230<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Zona natapanja obi\u010dno je na 150 \u00b0C.<\/p><\/li><li><p>Zona taljenja treba dose\u0107i oko 245 \u00b0C za olovno-slobodni lem.<\/p><\/li><li><p>Nemojte dopustiti da temperatura poraste prebrzo, primjerice na 95 \u00b0C, ina\u010de \u0107ete dobiti neujedna\u010deno zagrijavanje.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" >Savjeti za odr\u017eavanje<\/h3>\n\n\n\n<p>Redovito odr\u017eavanje osigurava ispravan rad va\u0161e pe\u0107i i sprje\u010dava probleme poput pucanja dijelova, izobli\u010denja i delaminacije. O\u010distite pe\u0107 i filter za fluks kako biste sprije\u010dili nakupljanje ostataka. Provjerite ventilatore i propelere kako bi zrak pravilno cirkulirao. Pregledajte grija\u010de i termoparove radi ispravnog o\u010ditavanja temperature. Prilagodite postupak za razli\u010dite materijale kako biste smanjili termi\u010dku \u0161tetu. Provjerite ispravan rad zona hla\u0111enja kako biste sprije\u010dili termi\u010dki \u0161ok i osigurali \u010dvrste lemne spojeve.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Praksa odr\u017eavanja<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Za\u0161to je va\u017eno<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Redovito \u010di\u0161\u0107enje<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Zaustavlja nakupljanje ostataka i sprje\u010dava pucanje ili delaminaciju<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Pregled kriti\u010dnih komponenti<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Smanjuje rizik od izobli\u010denja i neuspjeha<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>\u010ci\u0161\u0107enje sustava za filtraciju fluksa<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Sprje\u010dava kontaminaciju i opasnost od po\u017eara<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Provjera grija\u010da i termoparova<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Osigurava to\u010dna o\u010ditanja temperature<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Odr\u017eavanje zona hla\u0111enja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Sprje\u010dava toplinski \u0161ok i osigurava \u010dvrste lemne spojeve<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Napomena: Dobro odr\u017eavanje i pravi <a target=\"_blank\" href=\"https:\/\/www.chuxin-smt.com\/hr\/reflow-soldering-cooling-system-importance-optimization\/\" rel=\"noopener\">Profil temperature pe\u0107nice za reflow<\/a> poma\u017ee vam izbje\u0107i skupe nedostatke i odr\u017eati va\u0161e plo\u010de pouzdanima.<\/p><\/blockquote>\n\n\n\n<p>Mo\u017eete oja\u010dati lemne spojeve kontrolom svake temperaturne zone u pe\u0107i za reflow. Morate provjeriti i postaviti profil za svoju tiskanu plo\u010dicu i pastu za lemljenje. Kalibrirajte pe\u0107 \u010desto kako biste odr\u017eali ravnomjernu temperaturu. Istra\u017eivanja pokazuju ove va\u017ene to\u010dke:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Klju\u010dni zaklju\u010dak<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Opis<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.ltpcba.com\/how-reflow-soldering-temperature-zones-impact-pcb-quality\/\">Kontrola temperaturnih zona<\/a><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Morate upravljati svim \u010detirima temperaturnim zonama za \u010dvrste lemne spojeve.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Uskla\u0111ivanje profila temperature<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Provjerite da profil temperature odgovara va\u0161em dizajnu tiskane plo\u010dice kako biste sprije\u010dili nedostatke poput tombstoninga ili mostenja.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Redovita kalibracija pe\u0107nice<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Kalibriranje pe\u0107nice \u010desto sprje\u010dava pregrijavanje i neujedna\u010deno zagrijavanje koje mo\u017ee o\u0161tetiti dijelove.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Postupno zagrijavanje i hla\u0111enje<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Zagrijavanje i hla\u0111enje polako smanjuju toplinski stres i produ\u017euju vijek trajanja zglobova.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Metode ispitivanja<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Koristite razli\u010dite testove kako biste provjerili ostaju li lemni spojevi \u010dvrsti u razli\u010ditim uvjetima.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p>Koristite ove savjete kako biste svaki put dobili dobre, besprijekorne lemne spojeve. Ako \u017eelite jo\u0161 bolje rezultate, isprobajte nove na\u010dine testiranja i pode\u0161avanja svojih profila.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" >\u010cesto postavljana pitanja<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >\u0160to se doga\u0111a ako presko\u010dite kalibraciju pe\u0107nice za reflow?<\/h3>\n\n\n\n<p>Rizikujete neujedna\u010deno zagrijavanje i lo\u0161e lemne spojeve. Kalibracija odr\u017eava pe\u0107 to\u010dnom. Preskakanje ovog koraka mo\u017ee uzrokovati nedostatke poput mostova ili hladnih spojeva. Uvijek provjerite pe\u0107 prije po\u010detka nove serije.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Kako znate je li va\u0161 profil temperature ispravan?<\/h3>\n\n\n\n<p>Mo\u017eete koristiti termalni profiler za pra\u0107enje temperatura na svojoj tiskanoj plo\u010dici. Dobri profili pokazuju ravnomjerno zagrijavanje i ispravne vr\u0161ne temperature. Ako vidite nedostatke ili mutne spojeve, prilagodite svoje postavke.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Mo\u017eete li koristiti isti profil za sve paste za lemljenje?<\/h3>\n\n\n\n<p>Ne, ne biste trebali. Svaka pasta za lemljenje ima svoj to\u010dka topljenja i vlastite zahtjeve. Uvijek provjerite tehni\u010dki list proizvo\u0111a\u010da. Kori\u0161tenje pogre\u0161nog profila mo\u017ee uzrokovati lo\u0161e vla\u017eenje ili nepotpuni reflow.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Za\u0161to male promjene temperature uzrokuju nedostatke?<\/h3>\n\n\n\n<p>\u010cak i razlika od 5 \u00b0C mo\u017ee promijeniti na\u010din na koji se kalaj tali i te\u010de. Male promjene mogu dovesti do \u0161upljina, tombstoninga ili slabih spojeva. Morate odr\u017eavati temperaturu stabilnom za najbolje rezultate.<\/p>","protected":false},"excerpt":{"rendered":"<p>Proper Reflow Oven Temperature profiles ensure strong PCB solder joints, reduce defects like cold joints and bridging, and improve overall assembly reliability.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"categories":[1,52],"tags":[],"class_list":["post-3307","post","type-post","status-publish","format-standard","hentry","category-company-news","category-product-information"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/posts\/3307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/comments?post=3307"}],"version-history":[{"count":0,"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/posts\/3307\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/media?parent=3307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/categories?post=3307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/hr\/wp-json\/wp\/v2\/tags?post=3307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}