Скачать с ютуб HOW TO: Apply Weld Thru Coating в хорошем качестве

HOW TO: Apply Weld Thru Coating

Shawn Collins, 3M Senior Technical Services Engineer, talks about the proper use of 3M™ Weld-Thru II coating. Note: It’s not a primer (00:27) Primers promote adhesion for future coatings. This coating contains mostly zinc powder, so things won’t stick well with it. It's designed to go in between the flanges to protect the welds from corrosion. The zinc provides “sacrificial corrosion,” meaning it has a higher electrical charge than the steel surface. Once it’s applied, it transfers electrons to the surface and mitigates corrosion. Weld-through coating is considered a weld contaminant, and you shouldn’t actually weld through or right over the top of it (despite its name). Step 1: Consult the OEM (02:15) Always consult the OEM for their specific information on the use of a weld-through coating. They may specify the type of coating and how it’s used or even recommend not using it in certain cases. A lot of OEM statements specify to clean weld-through coating from the weld zone because you want to weld on clean bare metal only. Pro tip: Tools to abrade the surface (02:34) You’ll want to abrade the surfaces before applying, and there are a number of ways to do that. You could use a file belt sander with a ScotchBrite™ belt or an 80 grit abrasive. You could also use a Roloc™ grinder with an 80 grit abrasive or a clean-and-strip wheel, or a number of different products. Again, follow the instructions for the application of the product on the can. Step 2: Apply Weld-Thru coating (03:21) This product requires two light coats and 5 to 10 minutes of flash time in between. Don’t skip the second coat. It's important to get adequate film thickness coverage on the surfaces for good corrosion protection around the welds. Wait until the second coat is dry to the touch before welding. Pro tip: Mask it off (04:37) It helps to mask it off because this product doesn’t have binders like a regular primer. So nothing is going to stick well to it and it doesn’t stick well to other surfaces. If you get any overspray on the vehicle parts, you’ll need to clean it off. You can avoid that simply by masking it off to begin with. However, if you do get overspray, Weld-Thru wipes off very easily with typical body shop cleaners. Step 3: Remove the coating from the weld area (05:17) First, the best thing you can do before you test fit the panel is to punch the plug weld holes beforehand. Once the holes are punched and you mate the surfaces together, clamp them in place. Now you can see the Weld-Thru coating exposed in the center of the plug weld holes. Mark the holes with a marker, remove the clamps, and take off the top panel. You can easily see where you need to remove the coatings, and you can grind off those areas. Important note: There are of course many factors and variables that can affect an individual repair, so the technician and repair facility need to evaluate each specific application and repair process, including relevant vehicle, part and OEM guidelines, and determine what is appropriate for that repair.. Products used in this video: 3M™ Weld-Thru II 05917 https://www.3m.com/3M/en_US/company-u... 3M™ File Belt Sanders for Body Repair https://www.3m.com/3M/en_US/company-u... Scotch-Brite™ Durable Flex Belt https://www.3m.com/3M/en_US/company-u... 3M™ Welding and Spark Deflection Paper 05916 https://www.3m.com/3M/en_US/company-u... For more advanced tutorials, check out 3M Collision Repair Academy https://www.3m.com/3M/en_US/collision... You’ll find courses that will expand your knowledge, deliver practical procedures that you can use right away, and, in many cases, earn you I-CAR credits. Website: 3MCollision.com Instagram: Instagram.com/3MCollision Facebook: facebook.com/3MCollision