{"id":784,"date":"2021-04-12T10:30:23","date_gmt":"2021-04-12T10:30:23","guid":{"rendered":"https:\/\/www.hotairtools.com\/blog\/?p=784"},"modified":"2023-01-31T13:16:41","modified_gmt":"2023-01-31T13:16:41","slug":"how-to-weld-plastic","status":"publish","type":"post","link":"https:\/\/heatgun.com\/blog\/how-to-weld-plastic\/","title":{"rendered":"How to Weld Plastic with the Triac ST"},"content":{"rendered":"<div class=\"how-weld-plastic\">\n<h1>How to Weld Plastic with the Triac ST<\/h1>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/weld-plastic-triac-st.png\" alt=\"Plast weld guide: How to weld plastic with the Triac ST.\" \/><\/div>\n<p>Do you know why plastic is often chosen over steel? Plastic has the same structural strength as steel because of its greater elasticity. Plastic can absorb minor impacts, whereas steel can be deformed to the point of not being repairable. And best of all, if plastic is damaged, there\u2019s a great possibility that it can be repaired with welding, and no component strength is lost.<\/p>\n<p>If you want to repair plastic through welding, you\u2019ll need the right tool, and that\u2019s where the Leister Triac ST plays an integral role. Whether the plastic is warped, cracked, suffered a loss of material, or has a split, the Triac ST can remedy the problem. This makes plastic a more suitable material than steel as damaged steel takes time and money to fix.<br \/>\nAnother advantage of welding plastic is that, when correct procedures are followed, fumes are not produced. Plus, it\u2019s possible to restore plastic components to a new condition without using special treatments or fillers. If you add in the right repaint procedures, your repair will be invisible.<\/p>\n<p>So how do you correctly weld plastic with the Triac ST? This comprehensive guide will provide the answers.<\/p>\n<h2>A quick look at the Triac ST<\/h2>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/look-triac-st.png\" alt=\"A quick look at the Traic ST.\" \/><\/div>\n<p>As expected with any Leister product, the <a href=\"https:\/\/heatgun.com\/triac-st-cnfg.html\" target=\"_blank\" rel=\"noopener noreferrer\">Triac ST heat gun<\/a> is a top-quality tool. The Triac ST is Leister\u2019s culmination of knowledge and expertise that Leister has gained from making heatguns for the past 60 years. Versatile, reliable, and easy to use, the Triac ST features a two-component handle providing the perfect grip for users. Its light build at under one kilogram in weight also results in optimum weight balance.<\/p>\n<p class=\"left\">Additional highlights of the Triac ST:<\/p>\n<ul>\n<li>Temperature: 104-1292\u00b0F (40-700\u00b0C)<\/li>\n<li>Airflow 20 CFM (max temperature)<\/li>\n<li>Voltage V~: 120<\/li>\n<li>Heat-protective adaptor tube<\/li>\n<li>Electronic heating element protection<\/li>\n<li>Quick clean air filters<\/li>\n<li>Automatic motor shut-off with minimal carbon level<\/li>\n<li>Suitable for work sites<\/li>\n<\/ul>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/triac-st-img1.png\" alt=\"Plastic welding nozzles for the Triac ST.\" \/><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/triac-st-img2.png\" alt=\"Plastic welding rods for the Triac ST.\" \/><\/div>\n<h2 class=\"left\">Identifying the plastic you\u2019re working with<\/h2>\n<p>In vehicle manufacturing, most plastics used are thermoplastics. Thermoplastics can generally be welded when needed. With that said, there are several different thermoplastics used, and each has a specific temperature point for welding,<br \/>\nThe good news is that thermoplastics are easily identified. For plastic components on vehicles, vehicle manufacturers use material identification codes. Simply find the thermoplastic code to know which welding temperature to use.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Code<\/th>\n<th>Plastic<\/th>\n<th>Welding temperature<\/th>\n<\/tr>\n<tr>\n<td>ABS<\/td>\n<td>Acrylonitrile Butadiene Styrene<\/td>\n<td>662\u00b0F (350\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PC\/ABS<\/td>\n<td>Polycarbonate\/Acrylonitrile Butadiene Styrene<\/td>\n<td>662\u00b0F (350\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PA<\/td>\n<td>Polyamide (Nylon)<\/td>\n<td>752\u00b0F (400\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PBT<\/td>\n<td>Polybutylen Terephtalate<\/td>\n<td>662\u00b0F (350\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PC<\/td>\n<td>Polycarbonate<\/td>\n<td>662\u00b0F (350\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PE<\/td>\n<td>Polyethylene<\/td>\n<td>572\u00b0F (300\u00b0C)(hard)<br \/>\n518\u00b0F (270\u00b0C)(soft)<\/td>\n<\/tr>\n<tr>\n<td>PP<\/td>\n<td>Polypropylene<\/td>\n<td>572\u00b0F (300\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PP\/EPIDM<\/td>\n<td>Rubber-modified Polypropylene<\/td>\n<td>572\u00b0F (300\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PUR<\/td>\n<td>Polyurethane<\/td>\n<td>572\u00b0F\/662\u00b0F (300\u00b0C\/350\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>PVC<\/td>\n<td>Polyvinyl Chloride<\/td>\n<td>572\u00b0F (300\u00b0C)(hard)<br \/>\n662\u00b0F (350\u00b0C)(soft)<\/td>\n<\/tr>\n<tr>\n<td>GRP\/SMC<\/td>\n<td>Glass Fiber Reinforced Plastics<\/td>\n<td>N\/A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Note: Not all polyurethane (PUR) is weldable. Glass fiber-reinforced plastics are not weldable.<br \/>\nWhat if you\u2019re dealing with polyurethane or don\u2019t have the required information to identify the plastic you intend to weld? Fortunately, you can conduct a test weld.<\/p>\n<p>A test weld is done by using an appropriate <a href=\"https:\/\/heatgun.com\/hot-air-tools\/plastic-welding\/welding-rod.html\" target=\"_blank\" rel=\"noopener noreferrer\">plastic welding rod<\/a>, which is included with your Triac ST, on the back of the plastic component. You\u2019ll then test different temperatures until you find the optimum one for welding.<\/p>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/triac-st-main.png\" alt=\"A guide for how to weld with the Triac ST.\" \/><\/div>\n<h2 class=\"left\">How to weld with the Triac ST<\/h2>\n<p>This section will teach you how to weld using the Triac ST. While Triac ST makes the job an easier one, there are still several steps to complete the job.<\/p>\n<h3>1. Surface preparation<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/surface-preparation.png\" alt=\"The rotary control on the rear of the hot-air tool enables accurate setting of welding temperatures up to 650-C.\" \/><\/div>\n<p>The first step might not seem considerable, but don\u2019t discount the importance of preparing the surface of the weld-bound plastic component.<\/p>\n<p>There are various aspects to consider when it comes to surface preparation. First, you have to decide if the plastic component is going to be repaired from either the front or rear. This decision will come down to which option provides the greater access. You can utilize reinforcement welds to the rear of a front repair, as this can repair the strength lost due to the damage suffered by the plastic component.<\/p>\n<p>When the damaged component has a protective or decorative trim, it has to be removed if the damage goes beyond the trim. The trim must be separated to grant you full access to the area that needs repairing. You should only do this removal if the trim isn\u2019t cold to prevent unrepairable damage.<\/p>\n<p>The good news is the trim is usually fixed to the component with an adhesive that softens by using an appropriate heat treatment. That appropriate heat treatment can be supplied by the Triac ST. This tool can deliver 230 liters of air per minute and can be done at a wide range of temperatures \u2013 from a relatively cool 68\u00b0F (20\u00b0C) to a blazing hot 1292\u00b0F (700\u00b0C).<\/p>\n<p>As for trim removal, set the temperature at 572\u00b0F (300\u00b0C) and use the Triac ST without the welding nozzle attached. Move the device evenly over the trim surface to deliver heat absorption to soften the adhesive. Once soft, you should be able to pull away the trim with ease. Place it to the side so it can be reused following the weld repair.<\/p>\n<h3 class=\"left\">2. Welding groove<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/welding-groove.png\" alt=\"A rotary burring tool is best to form the 90\u00b0 V groove for main welding operations. The 5.5 mm diameter bit (available with Leister hot air welding equipment) has cutting edges on the circumference and end face.\" \/><\/div>\n<p>To ensure the welding rod is accepted, a 90 V-shaped groove has to be prepped along the crack.<br \/>\nThe first step in the welding groove process is to remove any paint that might exist within the repair area. You can do this with a D\/A sander or body file. Remove any paint that\u2019s within 15 millimeters of the damage. As for materials that may have become trapped due to impact, applying heat of about 392\u00b0F (200\u00b0C) will typically help release them. However, if that doesn\u2019t do the job, a screwdriver blade is a useful tool to free any trapped materials.<\/p>\n<p>The V groove can be formed in two main ways. One way is to utilize a square-edged file to carefully form the groove. The better method, however, is to use a rotary burr bit complete with a cutting edge. A 90\u00b0 groove is created in one operation, and this includes following incredibly erratic crack courses. Keep in mind the groove depth should never go beyond two-thirds of the material\u2019s thickness.<\/p>\n<p>A high-speed drill will provide the best results. When you use a slow drill or a burring tool with a single cutting face, the device could jump out of the groove and cause imperfections. Once done, the welding rod should sit within the groove. The rod\u2019s upper curve face should protrude about 1 to 2 millimeters above the repair\u2019s surface to ensure enough penetration depth for the rod. There\u2019s no requirement for fillers.<\/p>\n<p>During the burring operation, safety is paramount. Make sure to wear a dust mask and eye protection to prevent plastic particles from causing irritation.<\/p>\n<h3 class=\"left\">3. Tack welding<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/track-welding.png\" alt=\"Tack welding with nozzle 28 allows realignment before main welding operations commence.\" \/><\/div>\n<p>A welding project is completed in two stages. The first stage is tack welding the crack\u2019s base. Due to the heat, the welding effectively knits together the sides of the crack \u2013 aligning both sections of the component as a result.<\/p>\n<p>When using the Triac ST for tack welding, make sure to attach welding nozzle 28 to the standard nozzle. Then ensure the temperature matches the type of plastic you\u2019re working on. Instead of completing the tack welding in parts, it\u2019s recommended to do so end-to-end in one continuous motion by taking the welding nozzle tip and drawing it across the base of every V groove. When doing this, the nozzle\u2019s heel should be slightly raised while you ensure its toe is in constant contact with the groove\u2019s base. Make sure the angle doesn\u2019t go beyond 20\u00b0 when measured against the angle of the groove base.<\/p>\n<p>How does the nozzle work? As you move the nozzle along the crack, the plastic situated below the nozzle\u2019s heel is softened by the hot air. The toe then brings together the softened material. A helpful tip to keep in mind is to apply pressure with the tool during the weld because the groove is thin and not strong.<\/p>\n<p>If the panel sides of the groove suffer a minor misalignment, it can be corrected by simply holding the sides in place until the tack welding has cooled and knitted. This approach can also help when you insert new material. To further increase the weld\u2019s strength, you can use cross welds to the underside.<\/p>\n<h3 class=\"left\">4. Main welding<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/main-welding.png\" alt=\"Trim welding rods to a pencil point to provide progressive fill to the start of the V groove. Main plastic welding operations are easier than conventional metal welding. Keep speed welding nozzle 5,7 or 7 mm parallel to the component surface exerting force only on the rod, not the tool.\" \/><\/div>\n<p>The main part of the welding process starts by preparing the welding rod. By using either side cutters or a trimming knife, turn the rod\u2019s end into a pencil-like point. Cutting it this way ensures the V groove receives a progressive fill, which is especially important when you start within the center of the panel as it prevents the formation of bulging plastic protrusions.<\/p>\n<p>After attaching the 5.7mm or 7mm speed welding nozzle to the Triac ST, set the tool to the correct temperature for the plastic you\u2019re working with. Sit the Triac ST down for a couple of minutes so it can warm up.<\/p>\n<p>Remember the trimmed welding rod? Insert it into the nozzle feed, continuing until about 5 millimeters of the rod sticks out on the underside. Keep the Triac ST steady so that the welding nozzle runs solely along the crack, which is parallel to the plastic component surface. Note: The rod has to stick out and be held beyond the V groove\u2019s start to ensure heat for the weld is directed towards the start point.<\/p>\n<p>Once the surface plastic displays slight wetting signs, begin moving the welding nozzle across the groove. A 3mm air gap should be maintained under the heel of the nozzle. Ensure the rod is steadily fed into the nozzle, going with approximately 2.5 kilograms of pressure to push the rod sufficiently into the groove. Always attempt to complete this part with one continuous run when possible.<\/p>\n<h2 class=\"left\">Completing the job<\/h2>\n<p>Once the weld has been completed, the work isn\u2019t finished. There are two remaining steps: welding dressing and painting.<\/p>\n<h3 class=\"left\">1. Welding dressing<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/welding-dressing.png\" alt=\"Picture for welding dressing.\" \/><\/div>\n<p>With a successful weld, the component surface will feature a slightly raised bead that will need to be flattened for the component to regain its natural appearance.<\/p>\n<p>Flattening the bead requires welding dressing in which a grinding disc is used to smooth out the bead. Keep in mind that despite its overall structural strength, plastic is still a soft material. An abrasive disc is going to easily break down the plastic. Therefore, first use a 120-grit disc, and then progress to a 180-grit disc before finishing with a 320-grit disc. Doing so will result in a smooth finish.<\/p>\n<p>If you want to go a step further with the smoothness, it\u2019s recommended to use a very fine abrasive paper. Around each side of the weld area, allow a margin of between 7-10 centimeters for dressing, which is essential for painting.<\/p>\n<p><strong>Note:<\/strong> Only complete this process when the weld is cold. The sanding disc will become clogged with warm welds.<\/p>\n<h3 class=\"left\">2. Painting plastics<\/h3>\n<div class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.hotairtools.com\/blog\/wp-content\/uploads\/2021\/04\/painting-plastics.png\" alt=\"Refinish the entire component to make the plastic repair invisible.\" \/><\/div>\n<p>After the welding dressing, you\u2019re ready for the final step of painting. Unfortunately, not every paint type is applicable for use on plastic. However, the good news is that there are various paint types available for plastic components. To find an approved paint type, contact the vehicle manufacturer for more information.<br \/>\nStart the painting process by thoroughly cleaning the plastic component to ensure high-quality paint adhesion. Before using any cleaning agent, check to see if it\u2019s compatible with the paint type you plan to use.<\/p>\n<p>For a completely invisible repair, paint the entire component, not just the welded area. The end result is a plastic component that not only has an immaculate cosmetic finish but will also be as strong and reliable as it was originally.<\/p>\n<p>Using the Leister Triac ST for your <a href=\"https:\/\/heatgun.com\/hot-air-tools\/plastic-welding.html\" target=\"_blank\" rel=\"noopener noreferrer\">plastic welding<\/a> needs will help you get the perfect repair. And here at Heatgun, not only can we provide you with the Triac ST, but we\u2019re also here to provide you support and answer any questions you may have. Contact us anytime!<\/p>\n<p>Return back to the\u00a0<a href=\"https:\/\/heatgun.com\/blog\/\">Heatgun blog<\/a>.<\/p>\n<\/div>\n<style>\n.detail-post-main .detail-title { display: none;}<br \/>.how-weld-plastic .img { float: left; margin-right: 20px; margin-bottom: 20px;}<br \/>.how-weld-plastic table th,<br \/>.how-weld-plastic table td { border: 1px solid #000; padding: 5px 10px; }<br \/>.how-weld-plastic table { margin-bottom: 20px;}<br \/>.how-weld-plastic ul { clear: left;}<br \/>.how-weld-plastic .left { clear: left;}<br \/><\/style>\n","protected":false},"excerpt":{"rendered":"<p>How to Weld Plastic with the Triac ST Do you know why plastic is often chosen over steel? Plastic has the same structural strength as steel because of its greater elasticity. Plastic can absorb minor impacts, whereas steel can be deformed to the point of not being repairable. And best of all, if plastic is [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":808,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"Looking for ways to learn how to weld plastic? Click to read our how-to guilde about welding plastic and using Leister\u2019s top quality Triac ST welding tool.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Janet Maida\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/heatgun.com\/blog\/how-to-weld-plastic\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.8\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"- Just another WordPress site\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"How to Weld Plastic with the Triac ST -\" \/>\n\t\t<meta property=\"og:description\" content=\"Looking for ways to learn how to weld plastic? Click to read our how-to guilde about welding plastic and using Leister\u2019s top quality Triac ST welding tool.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/heatgun.com\/blog\/how-to-weld-plastic\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-04-12T10:30:23+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-01-31T13:16:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How to Weld Plastic with the Triac ST -\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Looking for ways to learn how to weld plastic? 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