{"id":4293,"date":"2026-03-24T03:11:31","date_gmt":"2026-03-23T19:11:31","guid":{"rendered":"https:\/\/www.chuxin-smt.com\/?p=4293"},"modified":"2026-03-24T03:11:31","modified_gmt":"2026-03-23T19:11:31","slug":"reflow-oven-improve-yield","status":"publish","type":"post","link":"https:\/\/www.chuxin-smt.com\/th\/reflow-oven-improve-yield\/","title":{"rendered":"Reflow Oven for EMS Factory: Which Features Improve Yield Without Increasing Operating Complexity?"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx.jpeg\" alt=\"Minimalist reflow oven cross\u2011section with nitrogen inlet, oxygen sensor, and key profile labels\" class=\"wp-image-4290\" srcset=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx.jpeg 1536w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx-300x200.jpeg 300w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx-1024x683.jpeg 1024w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx-768x512.jpeg 768w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235627-image_1774234921-2lnve5zx-18x12.jpeg 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" title=\"Reflow Oven for EMS Factory: Which Features Improve Yield Without Increasing Operating Complexity? - S&amp;M Co.Ltd\" \/><\/figure>\n\n\n\n<p>Automotive power\u2011device boards with big copper planes are unforgiving. BGA and CSP balls sit over heat\u2011hungry ground pads; flux exhausts early; \u0394T stretches across the panel. That\u2019s when insufficient wetting and head\u2011in\u2011pillow (HiP) creep in, chipping away at FPY and inviting latent reliability risk. The question isn\u2019t \u201cair or nitrogen?\u201d so much as \u201cwhich oven features let you tighten wetting and reduce HiP while keeping the line simple to run?\u201d<\/p>\n\n\n\n<p>This guide shows where a reflow oven can genuinely improve yield without adding operator burden\u2014starting with closed\u2011loop low\u2011oxygen control and supported by HiP\u2011aware thermal recipes. We\u2019ll also compare when vacuum is worth the cycle\u2011time hit.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u0e1b\u0e23\u0e30\u0e40\u0e14\u0e47\u0e19\u0e2a\u0e33\u0e04\u0e31\u0e0d<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Closed\u2011loop low\u2011oxygen control (set 500\u20131,000 ppm O2 for BGA\/CSP) stabilizes wetting and reduces oxidation without constant valve tweaking; pair it with HiP\u2011aware profiles to see the biggest lift.<\/p><\/li><li><p>For heavy\u2011copper automotive builds, target ramp 1.0\u20132.0 \u00b0C\/s, soak only as needed (150\u2013180 \u00b0C, 60\u2013120 s), peak 240\u2013245 \u00b0C, and TAL 60\u201390 s; hold \u0394T at liquidus \u226415\u201320 \u00b0C.<\/p><\/li><li><p>Use nitrogen closed\u2011loop first when HiP\/insufficient wetting dominates; bring in vacuum (5\u201350 mbar for 10\u201330 s near liquidus) when voiding on BTC\/QFN pads drives scrap.<\/p><\/li><li><p>Validate changes with 3D X\u2011ray, SPC on oxygen ppm and TAL\/peak, and a simple A\/B pilot before scaling.<\/p><\/li><li><p>Keep complexity low: one\u2011button recipe loads, ppm setpoint with alarm\/interlock, and automated logging instead of manual tweaks.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Root causes that keep BGA\/CSP joints from fully wetting on heavy\u2011copper boards<\/h2>\n\n\n\n<p>On power\u2011device boards, thermal mass and uneven heat flow stretch profiles and drain flux activity before all spheres reach and stay above liquidus. Dynamic package warpage can separate the solder ball from paste right when coalescence should occur, setting up HiP. Industry papers highlight warpage management and profile tuning as pivotal levers; shorter, better\u2011controlled ramps can reduce oxidation and flux depletion while fixturing and balanced copper reduce bow and twist. See process discussions in Circuits Assembly\u2019s analysis of HiP mechanisms and the iNEMI\/SMTAI technical brief on dynamic warpage strategies, which outline how component flatness changes with temperature and why equalizing \u0394T matters for coalescence.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Circuits Assembly on HiP mitigation and process\/material tactics (2017): see the analysis in the article Mitigation of Head\u2011in\u2011Pillow Defect for mechanism context and process levers.<\/p><\/li><li><p>iNEMI\/SMTAI (2023) paper by Burkholder: dynamic warpage measurement and low\u2011temperature profile strategies that reduce separation windows near liquidus.<\/p><\/li>\n<\/ul>\n\n\n\n<p>For day\u2011to\u2011day engineering, translate those mechanisms into checks you can run fast:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Watch \u0394T across the panel at liquidus; if it exceeds ~20 \u00b0C, HiP risk rises\u2014rebalance soak, conveyor speed, or use carriers.<\/p><\/li><li><p>Inspect BGA balls by oblique\/3D X\u2011ray; partial coalescence or distinct interfaces suggest insufficient wetting or HiP.<\/p><\/li><li><p>Confirm paste age, storage, and reflow delay; fatigued flux raises oxidation sensitivity.<\/p><\/li>\n<\/ul>\n\n\n\n<p>References for this section: Circuits Assembly feature (2017) on HiP; iNEMI\/SMTAI 2023 paper (Burkholder). Links provided below in later sections with full publisher anchors.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Micro\u2011recipes that reliably coalesce HiP\u2011prone joints (SAC305 on high\u2011mass builds)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Atmosphere setpoints: closed\u2011loop oxygen control<\/h3>\n\n\n\n<p>A nitrogen atmosphere improves wetting by suppressing oxide growth and keeping flux active longer. The added step that makes a reflow oven improve yield without operator micromanagement is closed\u2011loop oxygen control: a ppm sensor and PID\u2011driven valves hold the setpoint and trigger alarms\/interlocks if ppm drifts.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Practical target band for BGA\/CSP on high\u2011reliability boards: 500\u20131,000 ppm O2. Some precision builds run tighter (&lt;100 ppm), but diminishing returns and gas use increase below a few hundred ppm. Application notes from Heller Industries describe setting a ppm target and letting closed\u2011loop valves trim flow to maintain it while logging consumption and state. Process Sensing and Rapidox technical notes outline analyzer capabilities and control integration in reflow environments. See: the Heller Industries nitrogen control overview (2022), the Rapidox 1100\u2011ZR3\u2011PFC analyzer datasheet (2023), and Process Sensing guidance on O2 blanketing in reflow.<\/p><\/li>\n<\/ul>\n\n\n\n<p>Control logic that keeps complexity low:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>One setpoint (e.g., 700 ppm) with UCL\/LCL alarms (e.g., 900\/500 ppm) and an interlock to halt loading if ppm exceeds UCL for N samples.<\/p><\/li><li><p>Automatic standby\/eco modes when the conveyor is idle to reduce N2 use while preserving purge quality.<\/p><\/li><li><p>SPC logging of ppm against TAL\/peak to correlate atmosphere stability and wetting outcomes.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Thermal profile windows: SAC305 for heavy\u2011copper automotive boards<\/h3>\n\n\n\n<p>Start with these windows and tune with on\u2011product thermocouples per IPC\u20117530 practices and paste datasheets:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Ramp: 1.0\u20132.0 \u00b0C\/s (stay below 3.0 \u00b0C\/s). Favor the lower half on high\u2011mass boards to limit \u0394T and flux exhaustion.<\/p><\/li><li><p>Soak: 150\u2013180 \u00b0C for 60\u2013120 s only as needed to equalize temperature; excessive soak can promote oxidation and HiP.<\/p><\/li><li><p>Peak: 240\u2013245 \u00b0C starting point for HiP\u2011prone BGAs (SAC305). Some pastes allow up to ~250 \u00b0C\u2014follow the datasheet.<\/p><\/li><li><p>TAL: 60\u201390 s above ~217\u2013220 \u00b0C to ensure full coalescence without over\u2011aging the alloy.<\/p><\/li><li><p>Cooling: \u22644 \u00b0C\/s to minimize warpage stress and cracks.<\/p><\/li><li><p>\u0394T goal: \u226415\u201320 \u00b0C at liquidus across the BGA region.<\/p><\/li>\n<\/ul>\n\n\n\n<p>Indium\u2019s SAC305\/flux guidance and general lead\u2011free profiling literature support these ranges. Use 6\u201312 thermocouples on complex\/heavy assemblies\u2014under large BGAs, at copper\u2011dense zones, and at expected hot\/cold corners.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Nitrogen closed\u2011loop vs vacuum: where each makes a reflow oven improve yield without extra complexity<\/h2>\n\n\n\n<p>Closed\u2011loop nitrogen keeps oxidation at bay and stabilizes wetting with minimal operator input. Vacuum reflow, engaged near liquidus at low absolute pressures, is unmatched for void reduction on BTC\/QFN thermal pads and can also aid wetting by allowing volatiles to escape. Choose based on your dominant defect mode.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col \/><col \/><col \/><col \/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Atmosphere\/Method<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Expected effect on wetting\/voids (indicative)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Operating complexity<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Cycle\u2011time impact<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Air (baseline)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Adequate for some builds; higher oxidation risk; HiP risk on heavy copper<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u0e15\u0e48\u0e33<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>None<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Nitrogen, closed\u2011loop 500\u20131,000 ppm<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Better wetting\/shine; some void reduction; stable, logged ppm (Heller overview; Process Sensing notes)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Low: one setpoint + alarms\/interlock<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>None to minimal<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Vacuum during liquidus (5\u201350 mbar for 10\u201330 s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Large void reduction (vendor\u2011reported: often &lt;2\u20135% total void area in BTC\/QFN); can improve wetting on high\u2011mass boards (Heller; Rehm; Ersa)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Moderate: adds vacuum cycle presets and vent control<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>+10\u201330 s hold<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p>Vendor\u2011reported sources: Heller Industries on vacuum reflow void reduction and nitrogen control; Rehm Group\u2019s vacuum profile paper; Kurtz Ersa EXOS data sheet and blog notes. Treat percentages as vendor\u2011reported unless replicated on your line.<\/p>\n\n\n\n<p>Practical example (neutral, vendor\u2011specific): If you evaluate closed\u2011loop nitrogen or vacuum capability on a new oven, review spec pages for oxygen analyzer integration and vacuum cycle presets. For instance, S&amp;M\u2019s Vacuum Reflow Soldering product page lists a vacuum range (\u224810\u2013100 Pa), typical hold times, and PLC control; their nitrogen guide describes 10\u20131,000 ppm targets and flow ranges. See S&amp;M\u2019s guide A Comprehensive Guide To Nitrogen In Reflow Soldering and the Vacuum Reflow Soldering product page for implementation context.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Internal links:<\/p><ul><li><p>S&amp;M nitrogen guide: A Comprehensive Guide To Nitrogen In Reflow Soldering \u2014 <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/th\/slug-a-comprehensive-guide-to-nitrogen-in-reflow-soldering\/\">https:\/\/www.chuxin-smt.com\/slug-a-comprehensive-guide-to-nitrogen-in-reflow-soldering\/<\/a><\/p><\/li><li><p>S&amp;M vacuum reflow product: Vacuum Reflow Soldering \u2014 <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/th\/products\/vacuum-reflow-soldering\/\">https:\/\/www.chuxin-smt.com\/products\/vacuum-reflow-soldering\/<\/a><\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Validate before you scale: X\u2011ray, SPC, and a pilot A\/B design you can run this month<\/h2>\n\n\n\n<p>Run a three\u2011arm pilot: Air baseline; closed\u2011loop nitrogen at 500\u20131,000 ppm; and vacuum with low O2. Inspect all first\u2011run boards with 3D X\u2011ray per IPC\u20117095 practices; compute void % mean and standard deviation by package, track HiP incidence, and log FPY and rework. Maintain SPC on oxygen ppm and on\u2011product TAL\/peak.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col \/><col \/><col \/><col \/><col \/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Pilot arm (N=60 each)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Mean BGA ball void %<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Std Dev<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>HiP incidence<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>FPY<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Air baseline<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>14.2<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>5.8<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>5 in 60<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>92.0%<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>N2 closed\u2011loop 700 ppm<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>9.6<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>3.2<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1 in 60<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>96.5%<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Vacuum 30 mbar, 15 s + low O2<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>3.1<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1.1<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>0 in 60<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>98.0%<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p>Note: Illustrative numbers for planning; confirm with your paste, finish, and stack\u2011up. For acceptance, many automotive teams target average BGA void \u226410% and max single ball \u226420\u201325% (summaries of IPC\u20117095 and IPC\u2011A\u2011610); HiP is not acceptable when a gap is visible in oblique slices. For authoritative process\u2011control context, review Baker Hughes\u2019 white paper on automotive X\u2011ray inspection (2021) and secondary summaries of IPC acceptance.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx.jpeg\" alt=\"SPC control chart of oxygen ppm with one out-of-control point and control limits\" class=\"wp-image-4291\" srcset=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx.jpeg 1536w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx-300x200.jpeg 300w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx-1024x683.jpeg 1024w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx-768x512.jpeg 768w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1774235628-image_1774234990-2lpc80rx-18x12.jpeg 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" title=\"Reflow Oven for EMS Factory: Which Features Improve Yield Without Increasing Operating Complexity?1 - S&amp;M Co.Ltd\" \/><\/figure>\n\n\n\n<p>Caption: Individuals chart at a 700 ppm setpoint with 500\/900 ppm control limits. A brief out\u2011of\u2011control event at ~950 ppm should trigger an interlock and hold loading until recovery. For ppm diagnostics across zones, tools like SolderStar\u2019s Reflow Shuttle O2 help locate leaks; Rapidox analyzers document multi\u2011channel control for closed\u2011loop systems.<\/p>\n\n\n\n<p>Authoritative reading:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Heller Industries nitrogen control overview (2022): closed\u2011loop setpoints and consumption savings.<\/p><\/li><li><p>SolderStar Reflow Shuttle O2 product page: zone\u2011by\u2011zone oxygen diagnostics.<\/p><\/li><li><p>Rapidox 1100\u2011ZR3\u2011PFC datasheet (2023): analyzer integration for closed\u2011loop.<\/p><\/li><li><p>Baker Hughes white paper (2021): automotive X\u2011ray inspection guidance.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Low\u2011touch operator workflow and implementation checklist<\/h2>\n\n\n\n<p>Here\u2019s the deal: if operators need to chase valves and tweak profiles every hour, complexity wins and yield loses. Lock down a low\u2011touch workflow:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Load the validated recipe; auto\u2011apply ppm setpoint (e.g., 700 ppm) with visual UCL\/LCL bands and alarm\/interlock.<\/p><\/li><li><p>Run on\u2011product TC checks at NPI or shift start; verify \u0394T at liquidus \u226420 \u00b0C and TAL within limits; then lock.<\/p><\/li><li><p>Enable standby purge and auto\u2011ramp when idle to cut N2 use without quality drift.<\/p><\/li><li><p>Route ppm, TAL, and peak to SPC charts; investigate any correlation between limit breaches and wetting defects.<\/p><\/li><li><p>For vacuum\u2011equipped lines, select the preset (e.g., 30 mbar, 15 s at liquidus) and verify controlled vent timing.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Trade\u2011offs to plan for (CapEx, OPEX, safety, maintenance)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Nitrogen consumption and cost: Typical reflow consumption is on the order of 15\u201335 m\u00b3\/h depending on zone count and ppm targets; closed\u2011loop control can reduce flow versus fixed\u2011valve purges. On\u2011site generation OPEX spans roughly cents per CCF with CapEx varying widely by purity and flow. See indicative ranges discussed by Gas Generation Solutions and Heller\u2019s notes on consumption reduction via closed\u2011loop.<\/p><\/li><li><p>Cycle time and throughput: Closed\u2011loop nitrogen adds no meaningful cycle time. Vacuum dwell typically adds 10\u201330 s per panel; confirm line balance and buffer capacity.<\/p><\/li><li><p>Safety and interlocks: Oxygen sensors need periodic calibration; interlocks should prevent production above ppm thresholds. Vacuum venting must be controlled to avoid solder disturbance.<\/p><\/li><li><p>Maintenance cadence: Keep analyzer filters, sensor cells, and vacuum seals in PM schedules; log ppm sensor drift alongside oven zone deviations.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">References and further reading (selected)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Heller Industries \u2014 Nitrogen control overview describing closed\u2011loop ppm setpoints and PID valves (2022): <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/hellerindustries.com\/wp-content\/uploads\/2022\/04\/nitrogencontrol-1.pdf\">https:\/\/hellerindustries.com\/wp-content\/uploads\/2022\/04\/nitrogencontrol-1.pdf<\/a><\/p><\/li><li><p>Rehm Group \u2014 What does soldering with vacuum profiles offer? Vendor paper discussing pressure and timing near liquidus: <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.rehm-group.com\/fileadmin\/user_upload\/PDF_EN\/final_What_does_soldering_with_vacuum_profiles_offer.pdf\">https:\/\/www.rehm-group.com\/fileadmin\/user_upload\/PDF_EN\/final_What_does_soldering_with_vacuum_profiles_offer.pdf<\/a><\/p><\/li><li><p>Kurtz Ersa \u2014 EXOS 102 system data (vendor\u2011reported voiding improvements): <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.sinerji-grup.com\/dosyalar\/kataloglar\/3797\/kurtz-ersa-exos-1026-data-sheet.pdf\">https:\/\/www.sinerji-grup.com\/dosyalar\/kataloglar\/3797\/kurtz-ersa-exos-1026-data-sheet.pdf<\/a><\/p><\/li><li><p>SolderStar \u2014 Reflow Shuttle O2 for zone\u2011level oxygen diagnostics: <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.solderstar.com\/en\/solderstar-solutions\/solutions-reflow\/reflow-shuttle-o2\/\">https:\/\/www.solderstar.com\/en\/solderstar-solutions\/solutions-reflow\/reflow-shuttle-o2\/<\/a><\/p><\/li><li><p>Rapidox \u2014 1100\u2011ZR3\u2011PFC analyzer datasheet (closed\u2011loop integration example): <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.cambridge-sensotec.co.uk\/wp-content\/uploads\/2023\/04\/Rapidox-1100-ZR3-PFC-Technical-Datasheet.pdf\">https:\/\/www.cambridge-sensotec.co.uk\/wp-content\/uploads\/2023\/04\/Rapidox-1100-ZR3-PFC-Technical-Datasheet.pdf<\/a><\/p><\/li><li><p>Baker Hughes \u2014 X\u2011ray inspection in automotive electronics (2021) white paper: <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/dam.bakerhughes.com\/m\/7c043609618ddf4c\/original\/X-ray-inspection-of-electronics-in-automotive-manufacturing-Whitepaper-English.pdf\">https:\/\/dam.bakerhughes.com\/m\/7c043609618ddf4c\/original\/X-ray-inspection-of-electronics-in-automotive-manufacturing-Whitepaper-English.pdf<\/a><\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<div><div data-widget-id=\"cd03a155-fc24-4182-b90a-eca4c6252c3b\" data-mode=\"production\"><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Closing and next steps<\/h2>\n\n\n\n<p>Pilot closed\u2011loop nitrogen at a 700 ppm setpoint with SPC and 3D X\u2011ray, then decide if vacuum is warranted for BTC\/QFN voids. For an implementation overview, see S&amp;M\u2019s neutral guide on nitrogen reflow: <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/th\/slug-a-comprehensive-guide-to-nitrogen-in-reflow-soldering\/\">https:\/\/www.chuxin-smt.com\/slug-a-comprehensive-guide-to-nitrogen-in-reflow-soldering\/<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Practical best practices for SMT\/EMS engineers: closed-loop nitrogen, vacuum trade-offs, and micro-recipes to reduce BGA wetting failures and Head\u2011in\u2011Pillow on heavy\u2011copper boards.<\/p>","protected":false},"author":3,"featured_media":4292,"comment_status":"","ping_status":"","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":[57,60,66],"class_list":["post-4293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-news","category-product-information","tag-reflow-oven","tag-smt","tag-smt-equipment"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/posts\/4293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/comments?post=4293"}],"version-history":[{"count":0,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/posts\/4293\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/media\/4292"}],"wp:attachment":[{"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/media?parent=4293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/categories?post=4293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/th\/wp-json\/wp\/v2\/tags?post=4293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}