{"id":4292,"date":"2026-10-23T02:59:04","date_gmt":"2026-10-23T02:59:04","guid":{"rendered":"https:\/\/welleltron.com\/?page_id=4292"},"modified":"2026-10-23T04:27:15","modified_gmt":"2026-10-23T04:27:15","slug":"wave-soldering","status":"publish","type":"page","link":"https:\/\/welleltron.com\/ru\/kb\/wave-soldering\/","title":{"rendered":"Wave Soldering"},"content":{"rendered":"<style>.kb-table-of-content-nav.kb-table-of-content-id4292_b5b57b-2e .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kb-table-of-content-nav.kb-table-of-content-id4292_b5b57b-2e .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id4292_b5b57b-2e .kb-table-of-contents-title{font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id4292_b5b57b-2e .kb-table-of-content-wrap .kb-table-of-content-list{font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}<\/style>\n\n\n<h2 class=\"wp-block-heading\">1. What is Wave Soldering and Its Working Principle<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Wave soldering is a mass soldering process in which a populated circuit board passes over a controlled wave of molten solder to form component connections. It is commonly associated with through-hole assembly, although suitably designed surface-mount assemblies can also use the process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An <strong>automatic wave soldering machine<\/strong>\u2014often referred to as a <strong>wave solder machine<\/strong>, <strong>solder wave machine<\/strong>, or <strong>flow solder machine<\/strong>\u2014uses a specialized solder pot housing an impeller pump. This pump forces molten solder upward through a nozzle, creating a smooth, continuous wave of liquid metal. As the conveyor system transports the loaded PCB across this wave at a precise angle and speed, the exposed component leads and copper pads make contact with the molten solder, forming reliable metallurgical bonds simultaneously across hundreds of joints.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. How Does Wave Soldering Work?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The process has four main stages:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Fluxing:<\/strong> Flux prepares the metal surfaces for solder wetting.<\/li>\n\n\n\n<li><strong>Preheating:<\/strong> Controlled heating conditions the flux and warms the assembly before solder contact.<\/li>\n\n\n\n<li><strong>Soldering:<\/strong> Molten solder wets the pads and leads. In plated-through-hole joints, capillary action helps solder enter the gap between the lead and hole wall.<\/li>\n\n\n\n<li><strong>Cooling:<\/strong> As the board leaves the wave, excess solder drains away and the remaining solder solidifies into connections.<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3. PCB Design Considerations for Wave Soldering<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Optimizing a printed circuit board (PCB) for wave soldering requires strict adherence to <a href=\"https:\/\/welleltron.com\/kb\/dfm-rules\/\">Design for Manufacturability (DFM) <\/a>principles. Without proper layout planning, even the most advanced <strong>wave soldering machine<\/strong> will struggle to overcome physical barriers, resulting in common defects like bridging, cold joints, or un-filled barrels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Component Placement and Board Orientation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Direction of Travel Alignment:<\/strong> Align the long axes of passive components (such as resistors and capacitors) parallel to the conveyor&#8217;s direction of travel. This prevents &#8220;shadowing,&#8221; where a leading component blocks the solder wave from properly wetting a trailing component.<\/li>\n\n\n\n<li><strong>Component Spacing:<\/strong> Maintain adequate physical spacing between through-hole components and tall SMT parts. Crowded layouts prevent automated insertion heads and inspection equipment from operating efficiently, and can cause uneven thermal distribution across the wave.<\/li>\n\n\n\n<li><strong>Avoid SMT Devices on the Bottom Side:<\/strong> Placing surface-mount devices on the bottom (solder-side) of a wave-soldered board should be strictly limited. If bottom-side SMDs are necessary, they must be securely glued prior to wave entry or protected using custom wave solder pallets.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Lead Protrusion and Hole Sizing Guidelines<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Drill-to-Lead Clearance:<\/strong> The plated through-hole (PTH) diameter must be correctly proportioned relative to the component lead diameter.\n<ul class=\"wp-block-list\">\n<li><em>Standard Guideline:<\/em> Typically, the finished hole size should be <math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mn>0.15<\/mn><mtext>&nbsp;mm<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">0.15\\text{ mm}<\/annotation><\/semantics><\/math>0.15\u00a0mm to <math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mn>0.25<\/mn><mtext>&nbsp;mm<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">0.25\\text{ mm}<\/annotation><\/semantics><\/math>0.25\u00a0mm larger than the component lead diameter to allow optimal capillary wicking of the solder up the barrel.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Optimal Lead Length:<\/strong> Component leads protruding through the bottom of the PCB should be trimmed to a consistent length of 1.0\u00a0mm to 1.5\u00a0mm.\n<ul class=\"wp-block-list\">\n<li><em>Why it matters:<\/em> Leads that are too long act as thermal fins and increase the risk of solder bridging and icicles. Leads that are too short fail to form a proper mechanical anchor.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Thermal Relief and Copper Plane Connection<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Preventing Heat Sinking:<\/strong> Connecting a through-hole directly to a large internal ground or power plane draws thermal energy away rapidly from the joint, causing cold solder connections.<\/li>\n\n\n\n<li><strong>Using Thermal Relief Spokes:<\/strong> Always design connections between through-hole pads and copper planes using thermal relief patterns (spoke connections) to restrict heat dissipation and ensure proper solder wetting during wave contact.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Solder Thieves and Tear Drops (Pad Design)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Incorporating Tear Drops:<\/strong> Add tear-drop shapes where traces connect to through-hole pads. This reinforces the mechanical connection and prevents copper lifting during thermal stress.<\/li>\n\n\n\n<li><strong>Adding Solder Thieves (Triers):<\/strong> For dense pin arrays or trailing edges of the board, design sacrificial &#8220;solder thief&#8221; pads. These extra copper features attract excess solder as the board exits the wave, preventing bridging on critical signal <a href=\"https:\/\/welleltron.com\/pcb-pins\/\">pins.<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Solder Mask and Silkscreen Control<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solder Mask Dams:<\/strong> Ensure solder mask dams are present between adjacent closely spaced pads to act as a physical barrier against solder bridging.<\/li>\n\n\n\n<li><strong>Clearance Around Pads:<\/strong> Keep silkscreen text and reference designators well clear of annular rings. Silkscreen ink overlapping into the solder zone can contaminate the joint and cause outgassing or voiding.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-1024x683.jpg\" alt=\"Wave Soldering\" class=\"wp-image-4293\" style=\"aspect-ratio:1.499330655957162;width:632px;height:auto\" srcset=\"https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-1024x683.jpg 1024w, https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-300x200.jpg 300w, https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-18x12.jpg 18w, https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-768x512.jpg 768w, https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering-600x400.jpg 600w, https:\/\/welleltron.com\/wp-content\/uploads\/2026\/10\/Wave-Soldering.jpg 1324w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. Main Applications of Wave Soldering Equipment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Heavy-duty <strong>wave soldering equipment<\/strong> remains a staple in electronics manufacturing for specific high-volume architectures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pure Through-Hole Assemblies:<\/strong> Power supplies, relay boards, and industrial controllers featuring heavy axial and radial components.<\/li>\n\n\n\n<li><strong>Mixed Technology Boards:<\/strong> Assemblies combining surface-mount devices (SMDs) on the top side with through-hole components on the bottom, processed using specialized carrier pallets.<\/li>\n\n\n\n<li><strong>Automotive and Consumer Electronics:<\/strong> High-volume legacy or cost-sensitive modules requiring rapid throughput that cannot be matched by point-to-point selective systems.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. Differences Wave Soldering vs. Reflow Soldering<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Evaluating <strong>wave soldering vs reflow<\/strong>, <strong>reflow soldering vs wave soldering<\/strong>, or <strong>flow soldering vs reflow soldering<\/strong> depends entirely on the component packaging technology.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>What is Reflow Soldering?<\/strong> Reflow soldering relies on pre-applied solder paste melted inside a <strong>reflow solder<\/strong> oven using a thermal profile, primarily used for surface-mount devices.<\/li>\n\n\n\n<li><strong>Process Comparison:<\/strong> While reflow melts paste already screen-printed onto pads, wave soldering introduces molten solder dynamically via a wave to uncoated <a href=\"https:\/\/welleltron.com\/kb\/through-hole-assembly\/\">through-holes<\/a>.<\/li>\n\n\n\n<li><strong>Localized Alternatives:<\/strong> For high-density mixed boards where a standard solder wave would damage neighboring SMT parts, manufacturers compare <strong>selective soldering vs wave soldering<\/strong> or utilize specialized <strong>selective wave soldering<\/strong> nozzles.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><td><strong>Comparison Parameter<\/strong><\/td><td><strong>Wave Soldering<\/strong><\/td><td><strong>Reflow Soldering<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Primary Component Type<\/strong><\/td><td>Through-hole components (THT)<\/td><td>Surface-mount devices (SMD \/ SMT)<\/td><\/tr><tr><td><strong>Solder Application Method<\/strong><\/td><td>Pumped molten solder wave from a solder pot<\/td><td>Solder paste applied via stencil printing prior to heating<\/td><\/tr><tr><td><strong>Thermal Profile Control<\/strong><\/td><td>Single wave contact duration (2\u20134 seconds)<\/td><td>Multi-zone thermal profile over several minutes<\/td><\/tr><tr><td><strong>Tooling Requirements<\/strong><\/td><td>Often requires custom pallets for mixed technology<\/td><td>Stencils and pick-and-place feeders<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">6. Common Wave Soldering Defects and Prevention<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Maintaining high first-pass yield requires continuous monitoring for typical assembly flaws:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solder Bridging (Shorts):<\/strong> Occurs when excess solder connects adjacent pins. Prevented by optimizing conveyor speed, ensuring correct preheat temperatures, and adjusting wave parallelism.<\/li>\n\n\n\n<li><strong>Icicles and Spikes:<\/strong> Sharp points of hardened solder left on the trailing edge of a pin. Usually caused by insufficient board preheat or contaminated solder alloy.<\/li>\n\n\n\n<li><strong>Incomplete Barrel Fill:<\/strong> Solder fails to rise adequately through the plated through-hole. Rectified by increasing flux activation or adjusting the turbulent chip wave height.<\/li>\n\n\n\n<li><strong>Solder Blowholes \/ Pinholes:<\/strong> Outgassing from trapped moisture inside the PCB laminate. Prevented by proper board baking prior to assembly.<\/li>\n<\/ul>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78, .wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78[data-kb-block=\"kb-adv-heading4292_80d435-78\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78[data-kb-block=\"kb-adv-heading4292_80d435-78\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading4292_80d435-78[data-kb-block=\"kb-adv-heading4292_80d435-78\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<p class=\"kt-adv-heading4292_80d435-78 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading4292_80d435-78\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. What is Wave Soldering and Its Working Principle Wave soldering is a mass soldering process in which a populated circuit board passes over a controlled wave of molten solder to form component connections. It is commonly associated with through-hole assembly, although suitably designed surface-mount assemblies can also use the process. An automatic wave soldering&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"parent":2541,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"left","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-4292","page","type-page","status-publish","hentry"],"taxonomy_info":[],"featured_image_src_large":false,"author_info":{"display_name":"lucaismilelove@gmail.com","author_link":"https:\/\/welleltron.com\/ru\/blog\/author\/luciasmilelovegmail-com\/"},"comment_info":0,"_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"spectra_custom_meta":{"_uagb_previous_block_counts":["a:90:{s:21:\"uagb\/advanced-heading\";i:0;s:15:\"uagb\/blockquote\";i:0;s:12:\"uagb\/buttons\";i:0;s:18:\"uagb\/buttons-child\";i:0;s:19:\"uagb\/call-to-action\";i:0;s:15:\"uagb\/cf7-styler\";i:0;s:11:\"uagb\/column\";i:0;s:12:\"uagb\/columns\";i:0;s:14:\"uagb\/container\";i:0;s:21:\"uagb\/content-timeline\";i:0;s:27:\"uagb\/content-timeline-child\";i:0;s:14:\"uagb\/countdown\";i:0;s:12:\"uagb\/counter\";i:0;s:8:\"uagb\/faq\";i:0;s:14:\"uagb\/faq-child\";i:0;s:10:\"uagb\/forms\";i:0;s:17:\"uagb\/forms-accept\";i:0;s:19:\"uagb\/forms-checkbox\";i:0;s:15:\"uagb\/forms-date\";i:0;s:16:\"uagb\/forms-email\";i:0;s:17:\"uagb\/forms-hidden\";i:0;s:15:\"uagb\/forms-name\";i:0;s:16:\"uagb\/forms-phone\";i:0;s:16:\"uagb\/forms-radio\";i:0;s:17:\"uagb\/forms-select\";i:0;s:19:\"uagb\/forms-textarea\";i:0;s:17:\"uagb\/forms-toggle\";i:0;s:14:\"uagb\/forms-url\";i:0;s:14:\"uagb\/gf-styler\";i:0;s:15:\"uagb\/google-map\";i:0;s:11:\"uagb\/how-to\";i:0;s:16:\"uagb\/how-to-step\";i:0;s:9:\"uagb\/icon\";i:0;s:14:\"uagb\/icon-list\";i:0;s:20:\"uagb\/icon-list-child\";i:0;s:10:\"uagb\/image\";i:0;s:18:\"uagb\/image-gallery\";i:0;s:13:\"uagb\/info-box\";i:0;s:18:\"uagb\/inline-notice\";i:0;s:11:\"uagb\/lottie\";i:0;s:21:\"uagb\/marketing-button\";i:0;s:10:\"uagb\/modal\";i:0;s:18:\"uagb\/popup-builder\";i:0;s:16:\"uagb\/post-button\";i:0;s:18:\"uagb\/post-carousel\";i:0;s:17:\"uagb\/post-excerpt\";i:0;s:14:\"uagb\/post-grid\";i:0;s:15:\"uagb\/post-image\";i:0;s:17:\"uagb\/post-masonry\";i:0;s:14:\"uagb\/post-meta\";i:0;s:18:\"uagb\/post-taxonomy\";i:0;s:18:\"uagb\/post-timeline\";i:0;s:15:\"uagb\/post-title\";i:0;s:20:\"uagb\/restaurant-menu\";i:0;s:26:\"uagb\/restaurant-menu-child\";i:0;s:11:\"uagb\/review\";i:0;s:12:\"uagb\/section\";i:0;s:14:\"uagb\/separator\";i:0;s:11:\"uagb\/slider\";i:0;s:17:\"uagb\/slider-child\";i:0;s:17:\"uagb\/social-share\";i:0;s:23:\"uagb\/social-share-child\";i:0;s:16:\"uagb\/star-rating\";i:0;s:23:\"uagb\/sure-cart-checkout\";i:0;s:22:\"uagb\/sure-cart-product\";i:0;s:15:\"uagb\/sure-forms\";i:0;s:22:\"uagb\/table-of-contents\";i:0;s:9:\"uagb\/tabs\";i:0;s:15:\"uagb\/tabs-child\";i:0;s:18:\"uagb\/taxonomy-list\";i:0;s:9:\"uagb\/team\";i:0;s:16:\"uagb\/testimonial\";i:0;s:14:\"uagb\/wp-search\";i:0;s:19:\"uagb\/instagram-feed\";i:0;s:10:\"uagb\/login\";i:0;s:17:\"uagb\/loop-builder\";i:0;s:18:\"uagb\/loop-category\";i:0;s:20:\"uagb\/loop-pagination\";i:0;s:15:\"uagb\/loop-reset\";i:0;s:16:\"uagb\/loop-search\";i:0;s:14:\"uagb\/loop-sort\";i:0;s:17:\"uagb\/loop-wrapper\";i:0;s:13:\"uagb\/register\";i:0;s:19:\"uagb\/register-email\";i:0;s:24:\"uagb\/register-first-name\";i:0;s:23:\"uagb\/register-last-name\";i:0;s:22:\"uagb\/register-password\";i:0;s:30:\"uagb\/register-reenter-password\";i:0;s:19:\"uagb\/register-terms\";i:0;s:22:\"uagb\/register-username\";i:0;}"],"_edit_lock":["1792729635:1"],"rank_math_internal_links_processed":["1"],"rank_math_seo_score":["77"],"rank_math_focus_keyword":["Wave 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What is Wave Soldering and Its Working Principle Wave soldering is a mass soldering process in which a populated circuit board passes over a controlled wave of molten solder to form component connections. It is commonly associated with through-hole assembly, although suitably designed surface-mount assemblies can also use the process. 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