{"id":863,"date":"2026-01-12T09:00:00","date_gmt":"2026-01-12T01:00:00","guid":{"rendered":"https:\/\/smtbase.com\/smt-reflow-oven-guide\/"},"modified":"2026-08-23T22:25:42","modified_gmt":"2026-08-23T14:25:42","slug":"smt-reflow-oven-guide","status":"publish","type":"page","link":"https:\/\/www.smtbase.com\/es\/recursos\/smt-reflow-oven-guide\/","title":{"rendered":"Gu\u00eda sobre hornos de reflujo para SMT: zonas, perfiles t\u00e9rmicos y mantenimiento"},"content":{"rendered":"\n<style>\n:root{--navy:#07182e;--blue:#1468e5;--orange:#f47a32;--ink:#17263a;--line:#dfe7f1;--mist:#f4f7fb}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,\"Segoe UI\",Arial,sans-serif;line-height:1.72}a{color:var(--blue);text-decoration:none}.shell{width:min(1180px,calc(100% - 40px));margin:auto}.preview{padding:10px;color:#ffe8d8;background:#6e2e0d;text-align:center;font-size:12px;font-weight:700}.hero{padding:92px 0 43px;border-bottom:1px solid var(--line)}.hero .shell{width:min(1180px,calc(100% - 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40px))!important;height:auto!important;margin:34px auto 0!important;overflow:visible!important;border:0!important;border-radius:0!important;background:#eef2f6!important;box-shadow:none!important}\n.smt-article-page .smt-detail-cover img{display:block!important;width:100%!important;height:420px!important;aspect-ratio:auto!important;object-fit:cover!important;object-position:center!important;border:0!important;border-radius:0!important;box-shadow:none!important}\n.smt-article-page .smt-detail-cover figcaption{margin:7px 0 0!important;color:#7b8795!important;background:#fff!important;font-size:10px!important;line-height:1.5!important;text-align:right!important}\n.smt-article-page .smt-detail-cover figcaption a{color:#60758d!important}\n@media(max-width:760px){.smt-article-page .smt-detail-cover{width:calc(100% - 28px)!important;height:auto!important;margin-top:24px!important}.smt-article-page .smt-detail-cover img{height:auto!important;aspect-ratio:3\/2!important}}\n<\/style><div class=\"smt-page-full alignfull smt-article-page\"><header class=\"hero\"><div class=\"shell\"><nav class=\"crumbs\"><a href=\"\/\">Home<\/a><span>\/<\/span><a href=\"\/resources\/\">Resources<\/a><span>\/<\/span><strong>SMT Reflow Oven Guide<\/strong><\/nav><h1>SMT Reflow Oven Guide: Zones, Thermal Profiles and Maintenance<\/h1><p class=\"lead\">An SMT reflow oven heats a populated PCB through a controlled cycle so flux activates, solder melts and joints solidify during cooling. Zone setpoints and conveyor speed are inputs; temperatures measured on the actual assembly form the product profile used for process approval.<\/p><div class=\"meta\"><span>By SMTBase Editorial Team<\/span><span>Fact checked: 2026-08-23<\/span><span>3 min read<\/span><\/div><div class=\"warning\">Editorial status: technical reviewer name and credentials still need to be added before publication.<\/div><\/div><\/header><figure class=\"smt-detail-cover\"><img fetchpriority=\"high\" src=\"https:\/\/smtbase.com\/wp-content\/uploads\/2026\/08\/resource-cover-smt-reflow-oven.webp\" alt=\"HELLER 1913 MK7 multi-zone SMT reflow oven\" width=\"1200\" height=\"800\" loading=\"eager\" decoding=\"async\"><figcaption>Image source: <a href=\"https:\/\/hellerindustries.com\/reflow-ovens\/\" target=\"_blank\" rel=\"noopener noreferrer\">HELLER Industries<\/a><\/figcaption><\/figure><aside id=\"reader\"><span class=\"label\">Text size<\/span><button data-a=\"down\">A\u2212<\/button><button class=\"reset\" data-a=\"reset\">Reset<\/button><button data-a=\"up\">A+<\/button><span class=\"value\">100%<\/span><\/aside><main class=\"shell grid\"><aside class=\"toc\"><strong>In this guide<\/strong><nav><a href=\"#thermal-stages\">Thermal Stages<\/a><a href=\"#what-changes-a-profile\">What Changes a Profile?<\/a><a href=\"#defects-and-diagnosis\">Defects and Diagnosis<\/a><a href=\"#selection-and-maintenance\">Selection and Maintenance<\/a><a href=\"#faq\">FAQ<\/a><a href=\"#related-resources\">Related Resources<\/a><a href=\"#primary-sources\">Primary Sources<\/a><\/nav><\/aside><article class=\"article\"><p># SMT Reflow Oven Guide: Zones, Thermal Profiles and Maintenance<\/p>\n<p>An SMT reflow oven heats a populated PCB through a controlled cycle so flux activates, solder melts and joints solidify during cooling. Zone setpoints and conveyor speed are inputs; temperatures measured on the actual assembly form the product profile used for process approval.<\/p>\n<h2 id=\"thermal-stages\">Thermal Stages<\/h2>\n<div class=\"table-scroll\"><table><thead><tr><th>Stage<\/th><th>Purpose<\/th><th>Risk<\/th><\/tr><\/thead><tbody>\n<tr><td>Preheat<\/td><td>Controlled temperature rise<\/td><td>Stress and spatter<\/td><\/tr>\n<tr><td>Soak\/activation<\/td><td>Balance temperatures and activate flux<\/td><td>Oxidation or exhausted flux<\/td><\/tr>\n<tr><td>Reflow\/peak<\/td><td>Form solder joints above liquidus<\/td><td>Non-wetting or heat damage<\/td><\/tr>\n<tr><td>Cooling<\/td><td>Solidify joints<\/td><td>Warpage or disturbed joints<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>Limits must come from the paste supplier, component ratings, PCB and product requirements. A generic web profile is not an approved recipe.<\/p>\n<h2 id=\"what-changes-a-profile\">What Changes a Profile?<\/h2>\n<p>PCB copper and mass, component shielding, conveyor loading, airflow, atmosphere, rail contact and thermocouple placement all matter. Use an instrumented representative board. JUKI explains the reflow stage in its <a href=\"https:\/\/www.juki.co.jp\/en\/products\/smt.html\" target=\"_blank\" rel=\"noopener noreferrer\">SMT process overview<\/a>.<\/p>\n<h2 id=\"defects-and-diagnosis\">Defects and Diagnosis<\/h2>\n<p>Cold joints, tombstones, voids, solder balls, warpage and heat damage may involve printing, placement, materials or design as well as reflow. Do not change the oven before checking the full evidence chain.<\/p>\n<h2 id=\"selection-and-maintenance\">Selection and Maintenance<\/h2>\n<p>Confirm board range, throughput, heated length, zones, cooling, nitrogen, exhaust, flux management, recipe control, logging, power and service. Inspect flux collection, filters, fans, heaters, conveyor, rails, cooling and oxygen systems under approved safety procedures.<\/p>\n<h2 id=\"faq\">FAQ<\/h2>\n<h3 id=\"are-setpoints-the-same-as-board-temperature\">Are setpoints the same as board temperature?<\/h3>\n<p>No. Product temperatures depend on heat transfer and must be measured.<\/p>\n<h3 id=\"does-nitrogen-fix-solder-defects\">Does nitrogen fix solder defects?<\/h3>\n<p>It can reduce oxidation in suitable processes but cannot correct poor printing, contamination or a bad profile.<\/p><section class=\"related\"><h2 id=\"related-resources\">Related Resources<\/h2><div class=\"related-grid\"><a href=\"\/complete-smt-production-line-guide\/\">Complete SMT Production Line Guide<\/a><a href=\"\/solder-paste-printer-guide\/\">Solder Paste Printer Guide<\/a><a href=\"\/aoi-machine-guide\/\">AOI Machine Guide<\/a><a href=\"\/maintenance-parts\/\">SMT Maintenance Parts<\/a><\/div><\/section><section class=\"sources\"><h2 id=\"primary-sources\">Primary Sources<\/h2><ul><li><a href=\"https:\/\/hellerindustries.com\/smt-solder-reflow\/\" target=\"_blank\" rel=\"noopener noreferrer\">HELLER SMT solder reflow systems<\/a><\/li><li><a href=\"https:\/\/www.kester.com\/Portals\/0\/Documents\/Knowledge%20Base\/Standard_Profile.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Kester standard reflow profile<\/a><\/li><li><a href=\"https:\/\/www.kester.com\/knowledge-base\/faq\" target=\"_blank\" rel=\"noopener noreferrer\">Kester soldering knowledge base<\/a><\/li><\/ul><\/section><section class=\"cta\"><h2>Need help identifying an SMT replacement part?<\/h2><p>Send the machine model, part number and clear label photos. SMTBase will review the available sourcing options.<\/p><a href=\"\/contact\/\">Contact SMTBase \u2192<\/a><\/section><div class=\"note\">Preview note: technical review is required before publication.<\/div><\/article><\/main><script>(function(){var a=document.querySelector('.article'),r=document.getElementById('reader'),v=r.querySelector('.value'),s=100;function x(){a.style.setProperty('--fs',15*s\/100+'px');a.style.setProperty('--h2',32*s\/100+'px');a.style.setProperty('--h3',22*s\/100+'px');v.textContent=s+'%'}r.onclick=function(e){var b=e.target.closest('button');if(!b)return;if(b.dataset.a==='up')s=Math.min(130,s+5);if(b.dataset.a==='down')s=Math.max(85,s-5);if(b.dataset.a==='reset')s=100;x()};x()})();<\/script><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Understand reflow oven zones, conveyor speed, product profiling, common solder defects, maintenance and machine 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