{"id":41,"date":"2016-08-23T11:22:03","date_gmt":"2016-08-23T02:22:03","guid":{"rendered":"http:\/\/cms.japanunix.com\/wp\/?page_id=41"},"modified":"2026-04-22T12:54:53","modified_gmt":"2026-04-22T03:54:53","slug":"laser","status":"publish","type":"page","link":"https:\/\/www.japanunix.com\/en\/knowledge\/method\/laser\/","title":{"rendered":"Method and Theory of Laser Soldering"},"content":{"rendered":"<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"VideoObject\",\n      \"name\": \"Laser Soldering \u2013 Laser Soldering Magnetic Wire\",\n      \"description\": \"Video of high speed soldering placement using a laser head. Demonstrates laser soldering technique for magnetic wire applications.\",\n      \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/b2HNYxeGb48\/maxresdefault.jpg\",\n      \"uploadDate\": \"2010-02-05\",\n      \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/b2HNYxeGb48\",\n      \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=b2HNYxeGb48\"\n    },\n    {\n      \"@type\": \"VideoObject\",\n      \"name\": \"Robotic Soldering \u2013 Automatic Soldering Robot High Speed Point Solder\",\n      \"description\": \"Point soldering that is also a basic. High-speed and reliable soldering installation by a specialized robot.\",\n      \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/KI2wmP4Scp0\/maxresdefault.jpg\",\n      \"uploadDate\": \"2010-02-04\",\n      \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/KI2wmP4Scp0\",\n      \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=KI2wmP4Scp0\"\n    },\n    {\n      \"@type\": \"VideoObject\",\n      \"name\": \"Robotic Laser Soldering \u2013 High Output Laser Soldering Robot\",\n      \"description\": \"Speed comparison between high output laser and ordinary laser soldering robots.\",\n      \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/GAXExPxaiu0\/maxresdefault.jpg\",\n      \"uploadDate\": \"2013-06-18\",\n      \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/GAXExPxaiu0\",\n      \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=GAXExPxaiu0\"\n    },\n    {\n      \"@type\": \"VideoObject\",\n      \"name\": \"Robotic Laser Soldering \u2013 View of Laser Soldering Light\",\n      \"description\": \"Video of laser soldering assembly of very fine components, showing the laser soldering light in action.\",\n      \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/iqjpVepqWbU\/maxresdefault.jpg\",\n      \"uploadDate\": \"2013-06-18\",\n      \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/iqjpVepqWbU\",\n      \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=iqjpVepqWbU\"\n    }\n  ]\n}\n<\/script><\/p>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">Laser soldering is an advancing and developing next-generation soldering method<\/h2>\n<\/p><\/div>\n<div class=\"col-md-3\">\n<div class=\"_image align-center\">\n                <img decoding=\"async\" alt=\"Laser Top\" src=\"\/en\/wp\/wp-content\/uploads\/2022\/09\/laser_top_img.png\">\n            <\/div>\n<\/p><\/div>\n<div class=\"col-md-9\">\n<p>\u2013 Laser soldering, the newest soldering method, now gaining the world\u2019s attention \u2013<\/p>\n<p>Laser soldering is garnering attention as a new method. However, the heat application principle and other aspects differ from contact soldering. Therefore, tip soldering cannot be simply replaced to laser soldering. Caution is needed, because a laser\u2019s benefits might be lost unless it is properly used with knowledge of laser soldering\u2019s theory and characteristics. This section explains the basic theory of laser soldering method and the points about which care must be taken.<\/p>\n<p>\n  <a class=\"btn-primary\" href=\"https:\/\/www.japanunix.com\/en\/contact\/download_catalog#doc_handa\">Download PDF<\/a>\n<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">\u2013 What is the difference between a \u201csurface heat generation\u201d and \u201d thermal conduction\u201d? \u2013<\/h2>\n<p>In soldering, tip soldering is basically a 3 step process that encompasses pre-heating of soldering points, applying heat to supply the solder, and then post-heating to shape the solder and finish it. This workflow is the same whether using iron tip soldering or laser soldering, but the method of applying heat to supply the solder differs, and this is very important to understand.\n            <\/p>\n<h3 class=\"heading-title space-mt-p2\">[Tip soldering process]<\/h3>\n<div class=\"align-left\">\n<figure><img decoding=\"async\" src=\"\/en\/wp\/wp-content\/uploads\/2023\/05\/process-Iron-tip-soldering.jpg\" alt=\"process of iron tip soldering\"><br \/>\n                <\/figure>\n<\/p><\/div>\n<h3 class=\"heading-title space-mt-p2\">[Laser soldering process]<\/h3>\n<div class=\"align-left\">\n<figure><img decoding=\"async\" src=\"\/en\/wp\/wp-content\/uploads\/2023\/05\/process-laser-soldering.jpg\" alt=\"process of laser soldering\"><br \/>\n                <\/figure>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">Two different heat application principles<\/h2>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"grid-md-2\">\n<div class=\"_item\">\n<div class=\"t-box-light  matchheight\">\n<h4>Tip soldering process<\/h4>\n<ol class=\"list-type-circle\" start=\"1\">\n<li>The tip is heated to around 350C \/ 662F.<\/li>\n<li>The tip is placed onto the soldering point and heat is applied up to the melting temperature (heat transfer)<\/li>\n<li>Solder is supplied.<\/li>\n<\/ol><\/div>\n<\/p><\/div>\n<div class=\"_item\">\n<div class=\"t-box-light  matchheight\">\n<h4>Laser soldering process<\/h4>\n<ol class=\"list-type-circle\" start=\"1\">\n<li>The laser illuminates the soldering point.<\/li>\n<li>The illuminated area emits heat (surface heat emission).<\/li>\n<li>The heat transfers into the surrounding area and is raised to the melting temperature.<\/li>\n<li>Solder is supplied<\/li>\n<\/ol><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"row\">\n<div class=\"col-md-12\">\n<p>Contact soldering, heat is transferred from the iron tip, and in laser soldering, the lighted area generates heat. In contact soldering, the tip\u2019s own temperature is the upper limit, but in laser soldering, if laser shot is continuously pointed at one place, the temperature will unlimitedly rise.<br \/>\nTherefore, the light energy and time interval must be managed with care.<\/p>\n<\/p><\/div>\n<div class=\"col-md-6\">\n<div class=\"js-modal-video\" data-modal=\"#modal-media-target\" data-video-id=\"b2HNYxeGb48\">\n<div class=\"_thumb\">\n                    <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/b2HNYxeGb48\/maxresdefault.jpg\" alt=\"Laser soldering: Laser soldering Magnetic wire\">\n                <\/div>\n<\/p><\/div>\n<p class=\"text-size-medium\"><strong>Laser soldering<br \/>\n                    Laser soldering Magnetic wire<\/strong><br \/>\n                Video of high speed soldering placement using a laser head.\n            <\/p>\n<\/p><\/div>\n<div class=\"col-md-6\">\n<div class=\"js-modal-video\" data-modal=\"#modal-media-target\" data-video-id=\"KI2wmP4Scp0\">\n<div class=\"_thumb\">\n                    <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/KI2wmP4Scp0\/maxresdefault.jpg\" alt=\"Robotic soldering: Automatic soldering robot High speed point solder\">\n                <\/div>\n<\/p><\/div>\n<p class=\"text-size-medium\"><strong>Robotic soldering<br \/>\n                    Automatic soldering robot High speed point solder<\/strong><br \/>\n                Point soldering that is also a basic. High-speed and reliable soldering installation by a specialized robot\n            <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">\u2013 Why is the temperature so important? Laser soldering mechanism \u2013<\/h2>\n<p>The solder\u2019s composition status changes depending on the rising or falling temperature conditions, and optimal strength and reliability cannot be realized unless the temperature is appropriate. The fair temperature for soldering is a temperature in which the solder\u2019s internal composition changes hardly at all from before it was heated. When excessive heat has been applied, both strength and reliability decrease due to composition changes. Flux also flows differently at different temperatures, and when heat is applied at the right temperature, the flux will at first flow to the solder position, and will remove the surrounding oxide skin and dirt, and will improve the solder\u2019s tightness. The application of excessive heat will stop the flow of flux, instead making the solder flow first. Furthermore, excessive heat will damage the PCB and will create many problems such as board internal cracking that cannot be visually confirmed.\n            <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">-The impossible becomes possible after understanding laser soldering principles \u2013<\/h2>\n<p>The first main prerequisite for laser soldering is to use it with careful consideration about heat application conditions. It is actually an established technique, and depending on the way it is used and the application, it can replace some of the weaker areas of tip soldering to enable soldering that was previously impossible.\n            <\/p>\n<div class=\"panel-light\">\n<div class=\"_header\">\n                    <span>\u201cSpecial features\u201d<\/span>\n                <\/div>\n<div class=\"_body\">\n<ol class=\"list-type-number\">\n<li>Non-contact means it does not place a load on the PCB<\/li>\n<li>Efficient heat application and solder supply enables stable soldering automation<\/li>\n<li>It enables soldering in narrow confines on high-density board assembly.<\/li>\n<li>High maintainability<\/li>\n<\/ol><\/div>\n<\/p><\/div>\n<p class=\"space-mb-p2 space-mt-p2\">The most important characteristic of laser soldering is its non-contact soldering ability, and there is no contact at all with either the PCB or the component. There is no physical load placed on the PCB, only laser light and the solder supply. Laser\u2019s great advantages are in its ability to efficiently apply pinpoint heat, to apply light to confined spaces where a tip cannot fit, and to handle tightly-spaced assemblies, by changing the light angle and taking other steps. Maintenance work can also be reduced<\/p>\n<\/p><\/div>\n<div class=\"col-md-6\">\n<div class=\"js-modal-video\" data-modal=\"#modal-media-target\" data-video-id=\"GAXExPxaiu0\">\n<div class=\"_thumb\">\n                    <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/GAXExPxaiu0\/maxresdefault.jpg\" alt=\"Robotic laser soldering: High output laser soldering robot\">\n                <\/div>\n<\/p><\/div>\n<p class=\"text-size-medium\"><strong>Robotic laser soldering<br \/>\nHigh output laser soldering robot<\/strong><br \/>\n                Speed comparison between high output laser and ordinary laser\n            <\/p>\n<\/p><\/div>\n<div class=\"col-md-6\">\n<div class=\"js-modal-video\" data-modal=\"#modal-media-target\" data-video-id=\"iqjpVepqWbU\">\n<div class=\"_thumb\">\n                    <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/iqjpVepqWbU\/maxresdefault.jpg\" alt=\"Robotic laser soldering: View of laser soldering light\">\n                <\/div>\n<\/p><\/div>\n<p class=\"text-size-medium\"><strong>Robotic laser soldering<br \/>\nView of laser soldering light<\/strong><br \/>\n                Video of laser soldering assembly of very fine components\n            <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">\u2013 Future advances and developments of laser soldering \u2013<\/h2>\n<p>Japan Unix successfully commercialized a laser soldering system early on, just as we did with iron tip soldering. Furthermore, with a number of experiments, inspections, and evaluation trials, we have rigorously investigated the bond strength and reliability. Our extensive experience in systems introductions has let us establish application knowledge for laser soldering. We guarantee that customers can adopt these systems with confidence.<\/p>\n<p>However, laser soldering is absolutely not just a replacement for contact soldering. It is important to distinguish the strong points of each and match them to the application.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"c-box\">\n<div class=\"row\">\n<div class=\"col-md-12\">\n<h2 class=\"heading-title\">\u2013 Explore other methods \u2013<\/h2>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"row-md-3 row-2 text-align-center\">\n<div class=\"col\">\n            <a class=\"card-default\" href=\"\/en\/method\/iron_tips\/\"><\/p>\n<div class=\"_image\">\n<div class=\"_cover\">\n                        <img decoding=\"async\" src=\"\/en\/wp\/wp-content\/uploads\/2022\/09\/btn_kote.png\" alt=\"Iron Tip Icon\">\n                    <\/div>\n<\/p><\/div>\n<div class=\"_body\">\n<p class=\"_title\">Tip soldering<\/p>\n<\/p><\/div>\n<p>            <\/a>\n        <\/div>\n<div class=\"col\">\n            <a class=\"card-default\" href=\"\/en\/method\/ultrasonic\/\"><\/p>\n<div class=\"_image\">\n<div class=\"_cover\">\n                        <img decoding=\"async\" src=\"\/en\/wp\/wp-content\/uploads\/2022\/09\/btn_sonic.png\" alt=\"Ultrasonic Icon\">\n                    <\/div>\n<\/p><\/div>\n<div class=\"_body\">\n<p class=\"_title\">Ultrasonic soldering<\/p>\n<\/p><\/div>\n<p>            <\/a>\n        <\/div>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Laser soldering is an advancing and developing next-generation soldering method \u2013 Laser soldering, the newest soldering method, now gaining the world\u2019s attention \u2013 Laser soldering is garnering attention as a new method. However, the heat application principle and other aspects differ from contact soldering. Therefore, tip soldering cannot be simply replaced to laser soldering. Caution [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":944,"parent":21,"menu_order":87,"comment_status":"closed","ping_status":"closed","template":"page-default.php","meta":{"_themeisle_gutenberg_block_has_review":false},"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/pages\/41"}],"collection":[{"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/comments?post=41"}],"version-history":[{"count":10,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/pages\/41\/revisions"}],"predecessor-version":[{"id":18905,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/pages\/41\/revisions\/18905"}],"up":[{"embeddable":true,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/pages\/21"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/media\/944"}],"wp:attachment":[{"href":"https:\/\/www.japanunix.com\/en\/wp-json\/wp\/v2\/media?parent=41"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}