{"id":3221,"date":"2025-09-26T14:42:18","date_gmt":"2025-09-26T06:42:18","guid":{"rendered":"https:\/\/www.chuxin-smt.com\/slug-a-comprehensive-guide-to-wave-soldering-temperature\/"},"modified":"2026-08-02T19:01:20","modified_gmt":"2026-08-02T11:01:20","slug":"slug-a-comprehensive-guide-to-wave-soldering-temperature","status":"publish","type":"post","link":"https:\/\/www.chuxin-smt.com\/ro\/slug-a-comprehensive-guide-to-wave-soldering-temperature\/","title":{"rendered":"Un ghid cuprinz\u0103tor pentru temperatura de lipire prin und\u0103"},"content":{"rendered":"<h2 id=\"thecriticalroleoftemperatureinwavesoldering\">Rolul critic al temperaturii \u00een lipirea cu valuri<\/h2>\n<p>Lipirea cu valuri este un proces de lipire \u00een mas\u0103 care face parte integrant\u0103 din produc\u021bia modern\u0103 de electronice, \u00een special pentru fixarea componentelor prin g\u0103uri la pl\u0103cile cu circuite imprimate (PCB). \u00cen cadrul acestei metode extrem de eficiente, un PCB populat cu componente se deplaseaz\u0103 de-a lungul unui sistem de transport, trec\u00e2nd peste o tav\u0103 de lipire topit\u0103. \u00cen interiorul vasului, o pomp\u0103 genereaz\u0103 un val continuu de lipire care se spal\u0103 pe partea inferioar\u0103 a pl\u0103cii, cre\u00e2nd simultan leg\u0103turi metalurgice puternice la fiecare fir de component\u0103. De\u0219i aceast\u0103 tehnic\u0103 este o piatr\u0103 de temelie a produc\u021biei de mas\u0103, succesul s\u0103u depinde \u00een mod fundamental de controlul precis al numero\u0219i parametri, temperatura fiind cea mai important\u0103 variabil\u0103. Pentru o prezentare complet\u0103, pute\u021bi explora o defalcare detaliat\u0103 \u00een <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-a-step-by-step-guide-to-the-wave-soldering-process\/\">ghid pas cu pas pentru procesul de lipire \u00een val<\/a>.<\/p>\n<p>\u00centreaga c\u0103l\u0103torie de lipire \u00een val poate fi segmentat\u0103 \u00een trei etape termice esen\u021biale, fiecare juc\u00e2nd un rol distinct \u0219i vital \u00een calitatea final\u0103 a \u00eembin\u0103rii lipite.<\/p>\n<ol>\n<li><strong>Aplica\u021bie Flux:<\/strong> While not a thermal stage itself, flux application is the indispensable prerequisite to heating. A thin, uniform layer of flux is applied to the board\u2019s surface before it enters the heated zones. The flux\u2019s primary role is to act as a chemical cleaning agent, removing oxides and other surface contaminants from the metal pads and component leads. These oxide layers, if left untreated, would prevent the solder from properly wetting the surfaces, leading to weak or nonexistent joints. The subsequent preheating stage is what activates the flux, enabling it to perform this crucial function.<\/li>\n<li><strong>Pre\u00eenc\u0103lzire:<\/strong> Aceasta este prima etap\u0103 critic\u0103 de control al temperaturii. Ansamblul PCB este \u00eenc\u0103lzit treptat la o temperatur\u0103 \u021bint\u0103 specific\u0103 \u00eenainte de a intra \u00een contact cu valul de lipire topit. Aceast\u0103 etap\u0103 este vital\u0103 din mai multe motive. \u00cen primul r\u00e2nd, minimizeaz\u0103 riscul de \u0219oc termic pentru PCB \u0219i componentele sale. Expunerea brusc\u0103 la temperatura ridicat\u0103 a valului de lipire poate determina materialele s\u0103 se extind\u0103 prea repede, duc\u00e2nd la fisuri \u00een componente sau la delaminare a straturilor PCB <a href=\"https:\/\/www.amtechina.com\/what-is-wave-soldering-process-parameters-defects-and-guidelines\/\">[Sursa: AMTECH]<\/a>. \u00cen al doilea r\u00e2nd, procesul de pre\u00eenc\u0103lzire activeaz\u0103 \u00een mod corespunz\u0103tor fluxul, asigur\u00e2ndu-se c\u0103 acesta curge \u0219i cur\u0103\u021b\u0103 eficient. \u00cen cele din urm\u0103, prin reducerea diferen\u021bei de temperatur\u0103 dintre plac\u0103 \u0219i lipitura topit\u0103, pre\u00eenc\u0103lzirea adecvat\u0103 ajut\u0103 la prevenirea unei game de defecte de lipire \u0219i asigur\u0103 o umezire mai consistent\u0103.<\/li>\n<li><strong>Val de lipit:<\/strong> Aceasta este inima procesului, unde are loc ac\u021biunea de lipire. PCB se deplaseaz\u0103 pe un val dinamic de lipire topit\u0103, care trebuie men\u021binut\u0103 la o temperatur\u0103 extrem de precis\u0103. Pentru lipiturile moderne f\u0103r\u0103 plumb, cum ar fi SAC305 (staniu-argint-cupru), aceast\u0103 temperatur\u0103 se situeaz\u0103 de obicei \u00eentr-o fereastr\u0103 \u00eengust\u0103 \u00eentre 255\u00b0C \u0219i 265\u00b0C <a href=\"https:\/\/www.epectec.com\/pcd-guide\/wave-soldering.html\">[Sursa: EpecTec]<\/a>. If the solder temperature is too low, it can lead to poor wetting, voids, and unreliable \u201ccold joints.\u201d Conversely, if the temperature is too high, it can inflict thermal damage on sensitive electronic components, cause the PCB substrate to delaminate, and accelerate the formation of dross (oxides) in the solder pot, which degrades solder quality. Mastering the precise thermal curve is non-negotiable, a topic covered in depth in our guide on the <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-mastering-the-lead-free-wave-soldering-profile-a-comprehensive-guide\/\">profil de lipire \u00een val f\u0103r\u0103 plumb<\/a>.<\/li>\n<\/ol>\n<p>Ultimately, <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-a-comprehensive-guide-to-wave-soldering-temperature\/\">controlul temperaturii<\/a> is the absolute cornerstone of successful wave soldering. Every phase of the thermal profile\u2014from the gradual ramp-up in the preheating zone to the peak temperature of the solder wave and the controlled cooling rate afterward\u2014must be meticulously engineered and managed. Without this precision, manufacturers risk producing unreliable electronic assemblies plagued by defects like bridging and icicling, compromising both product quality and long-term reliability. To understand how this method compares to others, see our article on <a href=\"https:\/\/www.chuxin-smt.com\/ro\/wave-soldering-vs-reflow-which-fits-your-production-best\/\">lipire \u00een val vs. lipire prin reflow<\/a>.<\/p>\n<h2 id=\"understandingthewavesolderingthermalprofile\">\u00cen\u021belegerea profilului termic al lipirii prin und\u0103<\/h2>\n<p>Ob\u021binerea unei \u00eembin\u0103ri lipite impecabile \u0219i fiabile prin <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-a-step-by-step-guide-to-the-wave-soldering-process\/\">proces de lipire \u00een val<\/a> nu se refer\u0103 la o singur\u0103 temperatur\u0103, ci la st\u0103p\u00e2nirea unui profil termic atent controlat. Acest profil este un grafic timp-temperatur\u0103 care dicteaz\u0103 parcursul termic al ansamblului PCB. Acesta este compus din trei etape critice: pre\u00eenc\u0103lzirea, contactul cu unda de lipit \u0219i r\u0103cirea. Executarea acestui profil cu precizie este esen\u021bial\u0103 pentru activarea fluxului, prevenirea stresului termic \u0219i asigurarea form\u0103rii unei leg\u0103turi intermetalice robuste.<\/p>\n<h3 id=\"1preheatingstage\">1. Etapa de pre\u00eenc\u0103lzire<\/h3>\n<p>Etapa de pre\u00eenc\u0103lzire este faza ini\u021bial\u0103 \u0219i cea mai lung\u0103 a profilului termic. Obiectivul s\u0103u principal este cre\u0219terea treptat\u0103 \u0219i uniform\u0103 a temperaturii \u00eentregului ansamblu PCB. Aceast\u0103 cre\u0219tere controlat\u0103 a temperaturii este esen\u021bial\u0103 pentru prevenirea \u0219ocului termic, un fenomen care poate provoca fisuri microscopice \u00een componente sau poate duce la deformarea pl\u0103cii. Aceast\u0103 etap\u0103 \u00eendepline\u0219te, de asemenea, func\u021bia vital\u0103 de activare a fluxului lichid, permi\u021b\u00e2nd agen\u021bilor s\u0103i chimici s\u0103 \u00eendep\u0103rteze eficient oxizii de pe suprafe\u021bele metalice care urmeaz\u0103 s\u0103 fie lipite. O rat\u0103 controlat\u0103 de cre\u0219tere a temperaturii este esen\u021bial\u0103; \u00een general, rata de cre\u0219tere ar trebui s\u0103 fie men\u021binut\u0103 sub 2-4\u00b0C pe secund\u0103. \u00cenainte ca placa s\u0103 intre \u00een contact cu valul de lipire, temperatura superioar\u0103 a acesteia ar trebui s\u0103 fie \u00een mod ideal \u00eentre 100\u00b0C \u0219i 130\u00b0C <a href=\"https:\/\/www.epectec.com\/pcb\/wave-soldering\/process.html\">[Sursa: Epec Engineered Technologies]<\/a>. Pre\u00eenc\u0103lzirea insuficient\u0103 poate duce la activarea incomplet\u0103 a fluxului \u0219i la stres termic sever, \u00een timp ce pre\u00eenc\u0103lzirea excesiv\u0103 poate consuma prematur fluxul sau degrada componentele sensibile.<\/p>\n<h3 id=\"2solderwavecontactstage\">2. Etapa de contact cu und\u0103 de lipire<\/h3>\n<p>Aceasta este etapa principal\u0103 \u00een care are loc lipirea efectiv\u0103. Pe m\u0103sur\u0103 ce PCB trece peste vasul de lipit, un val dinamic de lipit topit intr\u0103 \u00een contact cu partea inferioar\u0103 a pl\u0103cii, curg\u00e2nd \u00een g\u0103urile de trecere placate \u0219i \u00een jurul cablurilor componentelor. Durata acestui contact, cunoscut\u0103 sub numele de timp de \u0219edere, este de obicei foarte scurt\u0103, dur\u00e2nd doar c\u00e2teva secunde. Temperatura valului de lipire este cel mai important parametru \u00een aceast\u0103 faz\u0103 \u0219i este dictat\u0103 de aliajul de lipire utilizat.<\/p>\n<ul>\n<li><strong>Lipire cu plumb (de exemplu, Sn63\/Pb37):<\/strong> These traditional alloys have a lower melting point, and the typical operating temperature for the solder wave is between 240\u00b0C and 250\u00b0C (464\u00b0F \u2013 482\u00b0F).<\/li>\n<li><strong>Lipire f\u0103r\u0103 plumb (de exemplu, aliaje SAC):<\/strong> Driven by environmental regulations, lead-free solders are now the industry standard. Due to their higher melting points, they require a significantly higher wave temperature, generally between 260\u00b0C and 270\u00b0C (500\u00b0F \u2013 518\u00b0F) <a href=\"https:\/\/www.pcb-technologies.com\/blog\/wave-soldering-temperature-profile-what-is-the-optimal-range\/\">[Sursa: PCB Technologies]<\/a>.<\/li>\n<\/ul>\n<p>Men\u021binerea unei temperaturi stabile \u0219i uniforme pe \u00eentreaga und\u0103 este vital\u0103 pentru crearea de filete de lipire consistente \u0219i de \u00eenalt\u0103 calitate. Pentru produc\u0103torii care navigheaz\u0103 prin complexitatea aliajelor moderne f\u0103r\u0103 plumb, <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-mastering-the-lead-free-wave-soldering-profile-a-comprehensive-guide\/\">st\u0103p\u00e2nirea profilului de lipire \u00een val f\u0103r\u0103 plumb<\/a> este cheia absolut\u0103 a succesului \u00een produc\u021bie.<\/p>\n<h3 id=\"3coolingstage\">3. Etapa de r\u0103cire<\/h3>\n<p>Immediately after exiting the solder wave, the PCB enters the final cooling stage. This is not a passive process; the rate of cooling must be carefully managed to ensure the formation of a strong, fine-grained solder joint structure. If the assembly cools down too rapidly (shock cooling), it can induce internal stresses, leading to brittle joints or micro-fractures that may fail later. Conversely, if the cooling process is too slow, it can result in the formation of a coarse grain structure, which weakens the joint\u2019s mechanical strength. The ideal cooling rate is typically less than 5\u00b0C per second <a href=\"https:\/\/www.ourpcb.com\/wave-soldering-temperature.html\">[Sursa: OurPCB]<\/a>. Aceast\u0103 sc\u0103dere controlat\u0103 a temperaturii permite lipirii s\u0103 se solidifice \u00eentr-o leg\u0103tur\u0103 metalurgic\u0103 robust\u0103, bloc\u00e2nd permanent componentele \u00een pozi\u021bie.<\/p>\n<h2 id=\"howpcbcharacteristicsinfluencetherequiredthermalprofile\">Cum influen\u021beaz\u0103 caracteristicile PCB profilul termic necesar<\/h2>\n<p>Ob\u021binerea unei lipituri perfecte nu poate fi realizat\u0103 printr-o abordare unic\u0103. Profilul de temperatur\u0103 ideal trebuie adaptat cu aten\u021bie la caracteristicile fizice \u0219i materiale unice ale fiec\u0103rui ansamblu specific de pl\u0103ci cu circuite imprimate. Optimizarea oric\u0103rui proces de lipire, de la val la reflow, necesit\u0103 o \u00een\u021belegere profund\u0103 a modului \u00een care variabile precum grosimea pl\u0103cii, densitatea componentelor \u0219i tipul de material influen\u021beaz\u0103 absorb\u021bia \u0219i distribu\u021bia c\u0103ldurii. Pentru cei care utilizeaz\u0103 metode bazate pe cuptor, un ghid detaliat privind crearea acestor profiluri poate fi g\u0103sit \u00een articolul nostru privind <a href=\"https:\/\/www.chuxin-smt.com\/ro\/set-reflow-oven-temperature-profile-for-better-soldering\/\">setarea profilului temperaturii cuptorului de reflow<\/a>.<\/p>\n<h3 id=\"pcbthicknessandthermalmass\">Grosimea PCB \u0219i masa termic\u0103<\/h3>\n<p>The thickness and layer count of a PCB are primary determinants of its thermal mass\u2014the amount of heat energy required to raise its temperature. A thick, multi-layered board has a significantly higher thermal mass than a thin, single-sided one. During preheating, it will require more energy and time to reach the target temperature uniformly. If the preheat stage is too short or the temperature is too low, the board\u2019s inner core may remain cool, leading to cold solder joints when it hits the solder wave. Conversely, applying a profile designed for a high-mass board to a low-mass one will result in overheating, potentially damaging components or causing the board to delaminate <a href=\"https:\/\/www.epectec.com\/pcb\/thermal-profiling.html\">[Sursa: Epec Engineered Technologies]<\/a>. Profilul trebuie ajustat, adesea prin prelungirea duratei \u00een zonele de pre\u00eenc\u0103lzire sau prin cre\u0219terea temperaturii, pentru a se asigura c\u0103 \u00eentregul ansamblu atinge echilibrul termic.<\/p>\n<h3 id=\"componentdensityanddistribution\">Densitatea \u0219i distribu\u021bia componentelor<\/h3>\n<p>The size, quantity, and placement of components also contribute significantly to the overall thermal mass and its distribution across the board. An assembly densely populated with large components like Ball Grid Arrays (BGAs), Quad Flat Packages (QFPs), and heat sinks absorbs and distributes heat very differently than a board with a sparse layout of small, discrete components. Large components can act as heat sinks, drawing thermal energy away from the solder joints and creating \u201cthermal shadows\u201d that prevent smaller nearby components from reaching the required temperature. An effective <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-mastering-the-pcb-reflow-temperature-profile-2\/\">Profil de temperatur\u0103 PCB reflow<\/a> often incorporates a \u201csoak\u201d zone, a period of sustained temperature, to allow the entire board to equalize, ensuring all components are uniformly heated before the final temperature spike <a href=\"https:\/\/www.anda.us\/blog\/importance-of-thermal-profiling-in-pcb-assembly-manufacturing\">[Sursa: Anda Technologies]<\/a>. Acest principiu se aplic\u0103 \u0219i etapei de pre\u00eenc\u0103lzire \u00een lipirea \u00een val.<\/p>\n<h3 id=\"boardmaterialandsolderalloy\">Materialul pl\u0103cii \u0219i aliajul de lipire<\/h3>\n<p>\u00cen timp ce FR-4 este cel mai r\u0103sp\u00e2ndit material de substrat, aplica\u021biile specializate necesit\u0103 materiale cu propriet\u0103\u021bi termice unice. Circuitele de \u00eenalt\u0103 frecven\u021b\u0103 pot utiliza materialul Rogers, \u00een timp ce aplica\u021biile de mare putere se bazeaz\u0103 adesea pe PCB-uri cu miez metalic (MCPCBs). Aceste materiale au conductivit\u0103\u021bi termice diferite, ceea ce afecteaz\u0103 \u00een mod dramatic modul de r\u0103sp\u00e2ndire a c\u0103ldurii. MCPCB-urile, de exemplu, sunt concepute pentru a disipa c\u0103ldura foarte eficient, ceea ce face dificil\u0103 men\u021binerea temperaturii de lipire necesare la \u00eembinare. Profilul de temperatur\u0103 trebuie s\u0103 fie mai agresiv pentru a compensa aceast\u0103 disipare rapid\u0103 a c\u0103ldurii f\u0103r\u0103 supra\u00eenc\u0103lzirea pieselor sensibile la temperatur\u0103. \u00cen plus, aliajul de lipit \u00een sine este un factor critic. Sudurile tradi\u021bionale cu staniu-plumb (SnPb) au un punct de topire de aproximativ 183\u00b0C. \u00cen schimb, aliajele moderne f\u0103r\u0103 plumb, precum SAC305, au puncte de topire mai ridicate, de obicei \u00eentre 217\u00b0C \u0219i 221\u00b0C. Acest lucru necesit\u0103 un profil mult mai fierbinte, temperaturile de v\u00e2rf pentru lipirea prin refulare ajung\u00e2nd la 235\u00b0C p\u00e2n\u0103 la 250\u00b0C, ceea ce este cu 20-30\u00b0C mai mare dec\u00e2t ceea ce este necesar pentru lipirea cu plumb <a href=\"https:\/\/www.pcb-technologies.com\/smt-reflow-soldering-process-explained\/\">[Sursa: PCB Technologies]<\/a>. Utilizarea profilului gre\u0219it poate duce la dezastru, de la topirea incomplet\u0103 a lipiturii la deterior\u0103ri termice grave. Pentru mai multe informa\u021bii despre acest subiect, explora\u021bi <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-a-deep-dive-into-the-reflow-soldering-process\/\">scufundare ad\u00e2nc\u0103 \u00een procesul de lipire prin reflow<\/a>.<\/p>\n<h2 id=\"commonsolderingdefectscausedbyincorrecttemperatures\">Defecte frecvente de lipire cauzate de temperaturile incorecte<\/h2>\n<p>Temperatura este elementul cheie \u00een realizarea unor \u00eembin\u0103ri prin lipire de \u00eenalt\u0103 calitate. Atunci c\u00e2nd profilul termic este incorect, pot ap\u0103rea o varietate de defecte de lipire comune \u0219i adesea costisitoare. \u00cen\u021belegerea modului de identificare, diagnosticare \u0219i corectare a acestor probleme prin ajustarea parametrilor de temperatur\u0103 este esen\u021bial\u0103 pentru asigurarea fiabilit\u0103\u021bii pe termen lung a oric\u0103rui ansamblu electronic.<\/p>\n<h3 id=\"coldjoints\">\u00cembin\u0103ri la rece<\/h3>\n<p>O \u00eembinare rece apare atunci c\u00e2nd lipirea nu se tope\u0219te complet \u0219i nu curge corespunz\u0103tor, rezult\u00e2nd o conexiune slab\u0103 \u0219i nesigur\u0103 \u00eentre cablul componentei \u0219i pl\u0103cu\u021ba PCB. Aceste \u00eembin\u0103ri sunt identificabile vizual prin aspectul lor tern, cenu\u0219iu, aspru sau cu noduli, f\u0103r\u0103 finisajul str\u0103lucitor \u0219i str\u0103lucitor al unei \u00eembin\u0103ri de lipit bune. Din punct de vedere electric, acestea reprezint\u0103 o responsabilitate major\u0103, cauz\u00e2nd adesea defec\u021biuni intermitente care sunt dificil de depanat.<\/p>\n<ul>\n<li><strong>Diagnosticul:<\/strong> Cauza principal\u0103 a unei \u00eembin\u0103ri reci este aproape \u00eentotdeauna c\u0103ldura insuficient\u0103. Aceasta poate proveni de la o temperatur\u0103 prea sc\u0103zut\u0103 a fierului de lipit, de la o aplicare a c\u0103ldurii prea scurt\u0103 sau de la un plan de mas\u0103 mare care \u00eendep\u0103rteaz\u0103 prea repede c\u0103ldura de la \u00eembinare <a href=\"https:\/\/www.allaboutcircuits.com\/technical-articles\/soldering-series-common-soldering-problems\/\">[Sursa: All About Circuits]<\/a>. \u00cen procesele automatizate, aceasta indic\u0103 faptul c\u0103 pre\u00eenc\u0103lzirea a fost insuficient\u0103 sau c\u0103 temperatura de v\u00e2rf a fost prea sc\u0103zut\u0103. Pentru o analiz\u0103 aprofundat\u0103 a acestei probleme, consulta\u021bi ghidul nostru privind <a href=\"https:\/\/www.chuxin-smt.com\/ro\/solving-cold-joints-in-reflow-soldering-expert-tips\/\">rezolvarea \u00eembin\u0103rilor reci \u00een lipirea prin reflow<\/a>.<\/li>\n<li><strong>Rezolu\u021bie:<\/strong> Fixarea \u00eembin\u0103rilor reci necesit\u0103 ajustarea profilului termic pentru a furniza mai mult\u0103 energie termic\u0103 \u00eembin\u0103rii. Acest lucru poate implica cre\u0219terea temperaturii de v\u00e2rf a valului de lipire sau a cuptorului de refulare sau prelungirea timpului deasupra lichidului (TAL) - durata pentru care lipirea r\u0103m\u00e2ne complet topit\u0103. O etap\u0103 robust\u0103 de pre\u00eenc\u0103lzire este, de asemenea, esen\u021bial\u0103, deoarece asigur\u0103 c\u0103 \u00eentregul ansamblu se afl\u0103 la o temperatur\u0103 ridicat\u0103, \u00eempiedic\u00e2nd placa s\u0103 ac\u021bioneze ca un radiator masiv \u00een timpul fazei finale de lipire <a href=\"https:\/\/blog.epectec.com\/7-common-pcb-soldering-problems-to-avoid\">[Sursa: Epec Engineered Technologies]<\/a>.<\/li>\n<\/ul>\n<h3 id=\"solderbridging\">Punte de lipire<\/h3>\n<p>Solder bridging is a defect where an excess amount of solder forms an unintended electrical connection between two or more adjacent pads or component leads. These \u201cshorts\u201d can cause immediate circuit malfunctions and are particularly challenging to detect when they occur under dense components like Ball Grid Arrays (BGAs).<\/p>\n<ul>\n<li><strong>Diagnosticul:<\/strong> Pun\u021bile sunt adesea cauzate de depunerea unei cantit\u0103\u021bi prea mari de past\u0103 de lipit sau de un profil termic incorect care permite lipiturii s\u0103 curg\u0103 necontrolat. \u00cen mod specific, o rat\u0103 de pre\u00eenc\u0103lzire prea agresiv\u0103 poate face ca pasta de lipit s\u0103 se pr\u0103bu\u0219easc\u0103 \u0219i s\u0103 se \u00eempr\u0103\u0219tie \u00eenainte de a se topi, cresc\u00e2nd semnificativ probabilitatea form\u0103rii pun\u021bilor <a href=\"https:\/\/www.techno.com.au\/blog\/identifying-and-preventing-common-soldering-issues-in-pcb-manufacturing\/\">[Sursa: Techno]<\/a>. Inspec\u021bia optic\u0103 (manual\u0103 sau automat\u0103) este principala metod\u0103 de detectare a acestui defect.<\/li>\n<li><strong>Rezolu\u021bie:<\/strong> Adjusting the thermal profile is a key solution. Reducing the preheat ramp rate can minimize solder paste slumping. Additionally, optimizing the peak temperature is crucial; if it is too high, it can lower the solder\u2019s surface tension and viscosity excessively, causing it to flow far beyond the pads. In wave soldering, adjusting the conveyor speed, flux application, and solder wave dynamics are also effective strategies, as detailed in our best practices for <a href=\"https:\/\/www.chuxin-smt.com\/ro\/reduce-solder-bridging-wave-soldering-best-practices\/\">reducerea pun\u021bilor de lipire<\/a>.<\/li>\n<\/ul>\n<h3 id=\"thermalshock\">\u0218oc termic<\/h3>\n<p>\u0218ocul termic descrie deterior\u0103rile sau fracturile care apar \u00eentr-un PCB sau \u00een componentele acestuia din cauza schimb\u0103rilor rapide de temperatur\u0103. Diferitele materiale utilizate \u00eentr-un ansamblu PCB - cum ar fi substratul FR-4, urmele de cupru \u0219i corpurile componentelor ceramice - toate se dilat\u0103 \u0219i se contract\u0103 la viteze diferite (coeficientul de dilatare termic\u0103). O cre\u0219tere brusc\u0103 a temperaturii genereaz\u0103 tensiuni mecanice imense care pot duce la fisuri catastrofale.<\/p>\n<ul>\n<li><strong>Diagnosticul:<\/strong> Acest defect apare adesea sub form\u0103 de fisuri microscopice \u00een corpurile componentelor, \u00een special \u00een cazul componentelor fragile, cum ar fi condensatoarele ceramice multistrat, sau \u00een rosturile de lipire. Aceste fisuri sunt adesea invizibile cu ochiul liber, dar se pot propaga \u00een timp, duc\u00e2nd la defec\u021biuni de c\u00e2mp latente. \u0218ocul termic este cel mai probabil s\u0103 apar\u0103 atunci c\u00e2nd diferen\u021ba de temperatur\u0103 dintre zonele de pre\u00eenc\u0103lzire \u0219i de v\u00e2rf ale lipirii este prea mare, iar tranzi\u021bia este prea rapid\u0103 <a href=\"https:\/\/www.esd-safe.com\/blog\/2023\/12\/28\/soldering-defects-and-causes-a-guide-to-quality-control\/\">[Sursa: Conductive Containers]<\/a>.<\/li>\n<li><strong>Rezolu\u021bie:<\/strong> Solu\u021bia definitiv\u0103 este controlul strict al ratei de ramp\u0103 \u00een cadrul profilului termic. Pentru majoritatea proceselor de lipire, o rat\u0103 de cre\u0219tere de 1-3\u00b0C pe secund\u0103 este o linie directoare sigur\u0103 \u0219i recomandat\u0103 at\u00e2t pentru \u00eenc\u0103lzire, c\u00e2t \u0219i pentru r\u0103cire. O cre\u0219tere treptat\u0103 \u0219i liniar\u0103 a temperaturii permite diverselor materiale de pe plac\u0103 s\u0103 se extind\u0103 \u0219i s\u0103 se contracte uniform, minimiz\u00e2nd tensiunile interne. Pentru orient\u0103ri specifice, consulta\u021bi ghidul nostru cuprinz\u0103tor privind <a href=\"https:\/\/www.chuxin-smt.com\/ro\/slug-mastering-the-pcb-reflow-temperature-profile-2\/\">st\u0103p\u00e2nirea profilului temperaturii de refulare a PCB<\/a>.<\/li>\n<\/ul>\n<h2 id=\"sources\">Surse<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.allaboutcircuits.com\/technical-articles\/soldering-series-common-soldering-problems\/\">All About Circuits \u2013 Soldering Series: Common Soldering Problems<\/a><\/li>\n<li><a href=\"https:\/\/www.amtechina.com\/what-is-wave-soldering-process-parameters-defects-and-guidelines\/\">AMTECH \u2013 What Is Wave Soldering Process? Parameters, Defects, and Guidelines<\/a><\/li>\n<li><a href=\"https:\/\/www.anda.us\/blog\/importance-of-thermal-profiling-in-pcb-assembly-manufacturing\">Anda Technologies \u2013 The Importance of Thermal Profiling in PCB Assembly Manufacturing<\/a><\/li>\n<li><a href=\"https:\/\/www.esd-safe.com\/blog\/2023\/12\/28\/soldering-defects-and-causes-a-guide-to-quality-control\/\">Conductive Containers \u2013 Soldering Defects And Causes: A Guide to Quality Control<\/a><\/li>\n<li><a href=\"https:\/\/blog.epectec.com\/7-common-pcb-soldering-problems-to-avoid\">Epec Engineered Technologies \u2013 7 Common PCB Soldering Problems to Avoid<\/a><\/li>\n<li><a href=\"https:\/\/www.epectec.com\/pcb\/wave-soldering\/process.html\">Epec Engineered Technologies \u2013 PCB Wave Soldering Process<\/a><\/li>\n<li><a href=\"https:\/\/www.epectec.com\/pcb\/thermal-profiling.html\">Epec Engineered Technologies \u2013 The Importance of Thermal Profiling for PCB Assembly<\/a><\/li>\n<li><a href=\"https:\/\/www.epectec.com\/pcd-guide\/wave-soldering.html\">EpecTec \u2013 Wave Soldering For Printed Circuit Board Assemblies<\/a><\/li>\n<li><a href=\"https:\/\/www.ourpcb.com\/wave-soldering-temperature.html\">OurPCB \u2013 Wave Soldering Temperature: Know the Ultimate Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.pcb-technologies.com\/blog\/wave-soldering-temperature-profile-what-is-the-optimal-range\/\">PCB Technologies \u2013 Wave Soldering Temperature Profile \u2013 What is the Optimal Range?<\/a><\/li>\n<li><a href=\"https:\/\/www.pcb-technologies.com\/smt-reflow-soldering-process-explained\/\">PCB Technologies \u2013 The SMT Reflow Soldering Process Explained<\/a><\/li>\n<li><a href=\"https:\/\/www.techno.com.au\/blog\/identifying-and-preventing-common-soldering-issues-in-pcb-manufacturing\/\">Techno \u2013 Identifying and Preventing Common Soldering Issues in PCB Manufacturing<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The Critical Role of Temperature in Wave Soldering Wave soldering is a bulk soldering process integral to modern electronics manufacturing, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":3220,"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 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