HOW TO: Apply Weld Thru Coating
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- Опубликовано: 7 сен 2024
- 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
www.3m.com/3M/...
3M™ File Belt Sanders for Body Repair
www.3m.com/3M/...
Scotch-Brite™ Durable Flex Belt
www.3m.com/3M/...
3M™ Welding and Spark Deflection Paper 05916
www.3m.com/3M/...
For more advanced tutorials, check out 3M Collision Repair Academy
www.3m.com/3M/...
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: 3MCollision
Facebook: 3MCollision
Finally a video that really shows how to use this stuff.
Yeah ....10:19 ....when this could have been fully explained in one minute.
if youre not supposed to weld through it and its not a primer, why do you keep calling it weld through primer?
Exactly… why is it called a weld through if you don’t weld through? What about if you’re spot welding instead of plug welding?
Haha true
Finally a video that makes sense.... im a DIY guy and while repairing my 2021 Honda Pilot which i had to replace multiple panels and then weld them together, i read the katest version of Honda collission repair manual and it explicitly say " remove WTP from the weld zone before PLUG welding"..... but then i asked the places were i bought the WTP and they said like if i was a moron.... " It says WELD THRU PRIMER" so you should be able to weld RIGHT ON TOP OF IT...and laugh at me like if I had 2 heads...... I feel vindicated now and can stop ny psychiatrist visits.....feel a ton of emotional pain left my bidy cause the "EXPERTS SAID.... see this is why people should let the EXPERTS do it and bot a DIY sunday guy..." well who is laughing now Mr. I SELL WTP and i know nothing about how to use it guy.....
😢😢😢😢😢😢
Sorry guys had it in my heart for years and needed to rant 😂😂😂😂😂😂
Informative. You can kill the music any time though.
Fk i need some of that spark protection paper! Got to do a floor rust out in the car with interior in place. Tips Guys - on lower pinch weld attach panels drill a tiny hole at each plug weld to locate it. I tape the flange, cut nickle sized circles on each plug weld leave the circles behind. Epoxy prime the rest, pull tape then spray weld through over the whole flange, its not going to hurt the epoxy.. then I clean in the 5/16 plug weld holes with broken bit. I just dont trust this stuff alone to much wash out between welds, or it would be used in other places.
Thanks Shawn. I miss the collaboration videos with Collision hub. I hope you guys do some more this year.
It should have been called weld around primer
Weld Around Primer* (*not a primer)
Really good stuff. Very useful information. Thank you and take care.
Thank you for the explanation.
I sprayed some of this on rust treated metal today and followed all directions including extensive shaking of the can and two coats. On some areas I have a hard silverish coating and some others I have a gray powdery coating. Can you please describe what the proper coating should look and feel like?
What about spot welding thru this stuff? I have seen conflicting info.
Spot welding through is perfectly acceptable unless the OEM specifically states not to, which I am not aware of. The compressing action of the spot welder prevents porosity that MAG welding can encounter in a weld puddle. Always make destructive weld tests and make sure the spot welder is adequate. Many spot welders have settings for welding through zinc coatings.
@@shawncollins5821 nice to hear this, exactly why i watched the video only to find an answer in the comments
you added another contaminate at 7:00 in the video.... the red sharpie ink on the edge of the plug holes....
Second coat of contaminant if you count the primer on the edge of the same hole. Third of you count the primer that weeps into the hole every time you weld.
i sold for Wurth for like four years and sold some of their zinc weld thru primer, plus all the competition had it. i used to laugh at why the can would sit in their cabinet or just get dust and overspray on it for months and even years and no one would ever use it. i see now it was because they were afraid to because they didn't know how. a good sales rep would have told them or held a clinic what have you. there are thousands of little two or three technician body shops out there just blasting cars together without using this. you don't rally need it, you just need it to do it right. it doesn't have to be perfect, it just has to look better.
So basically what you’re implying is that it just needs to look good from the outside, because longevity doesn’t matter since the car will either be sold or crashed in the near future, releasing the body shop of all liability it previously repaired
Would be a idea to have a strip down view after a corrosion test say 12 weeks o so
I guarantee you there is corrosion in between the panels if you use this product the way this man showed. This is a Band-Aid, it works fine in repair shops. Most people aren’t going to be holding onto that car forever. You cannot achieve perfect corrosion protection unless you’re able to dunk the whole car into P solution like the factory does.
isn't the point of a weld thru primer to weld through it? Why Is it called weld thru primer if you shouldn't weld thru it?
I stopped using this stuff a long time ago my cars only see dry weather anyway haven't had any problem with rust. If I was repairing a daily driver I'd probably go the extra mile just because it's gonna see winter weather conditions.
great videos. good content. i could live without the blaring music.
What’s the point of weld through coating if you grind it off before welding? Why not just use 2k primer?
Hi Anthony. You should only remove the Weld Thru Coating from the immediate weld zone. In other words, only from the plug weld hole when plug welding. Or only where your weld will cover the Weld Thru Coating anyways. Hope this helps!
@@3MCollision doesn't help! Still makes no sense. It's called "weld through" not weld near!
@@jamescook2251 i totally agree. If the weld through primer is a contaminant whats the benefit in using it? May as well use any other primer.
You are only cleaning it from the area that the weld will be covering anyways. Then the zinc is surrounding the weld zone and transferring the electrons to protect the steel. Extensive testing has shown other coatings without zinc will not provide the electron transfer and sacrificial protection the OEMs require.
@shawncollins5821 why doesn't oem use it then?
so I am confused now.. since this weld through primer, is not weldable and is not a primer,... let's imagine that was a frame rail and that after welding you wouldn't be able to reach it for painting... what product should you then use !?
True you can't weld directly on it, you can use a resistance spot welder leaving the mating surfaces covered with the primer. Internal frame coating can be used if you have inaccessible areas that require protection, Mig Spot/plug welds can be ground/sanded if needed & then cleaned and primed with a product that is compatible with the top coat.
Why not paint the frame rails first? It's tedious with having to tape the sections off paint then tape again. I tape the flanges and then paint the internal channels. Then remove the tape, clean the flanges and spray the weld through on the flanges mating surfaces.
Why remove the original ecoat and replace with weld thru if your going to grind it off at the plug weld points.. what if your using STRW . Why did they call it weld thru if your grinding it off? Zinc boils out at 1200 f copper doesn't boil well beyond the steel melting temperature plus it conducts electricity better to let it be a actually weld thru product..
Is there a primer that can be applied to the weld through? There are aftermarket body panels such as mustang cowls and floor pans that come pre painted with 3-M weld through. This video implies it should all be removed in exposed areas prior to painting.
Any coating that can be wiped off with a solvent should be wiped off areas to be painted. Only an epoxy primer or an etch primer followed with a 2K epoxy or 2K urethane primer will provide good adhesion on bare metal. Refer to the paint makers data sheets.
Necesito saber los precios por favor
If you are welding to a subframe flange and covering the area anyway do you still need to mask of the area? Will the weld thru primer lift paints if it is sprayed on top?
It will not lift paint. But if you spray a rustproofing in that area it may not stick well.
Paint will not stick well to weld through primer. Follow instructions on the can. Whenever painting one should make certain that the products, primer top coats etc, are compatible. If at all possible stay with the same line of products.
what clamps are those you are using?
They are Cleco clamps
@7:15 Weld thru primer is a misnomer sir. Please call it weld thru coating.
Hard habit to break 🤣
What clamps were those
Cleco clamps
this is the stupidest video instructions ever. so you have to spray it on a surface to cover it but then he says it doesn’t adhere to surfaces well and you have to wipe it off, whats the point then ? second he’s like hey this is not a primer its a coating then proceeds to call it a primer through out the rest if the video. And the name of this product has nothing to do with its actual use. you should have called it sacrificial spray or galvanizing spray. no wonder people have no clue how to use it i mean if i used it as its name suggests i would coat two parts and weld them together even with the coating on the welded area.
Actually, this video makes 100% sense, who knows what your talking about.
@@tarbash27 someone with an engineering degree and NACE CIP level 1 certification would know what im talking about 👍🏼
You’re literally only complaining about the name of the product… because of the video you know what it is and how it is used. If it doesn’t do what you want go find something else. The video was very clear idk why you’re so hostile
Why such an ironic inappropriate name then!!? Why not call it "weld overcoat" !
So it defeats the purpose if you want to keep your weld as corrosion free as possible if you spray it on then you take it off I mean...
After welding you can apply a rust prevention.
You probably want to delete Kevin Tyler's post. Not really 3M's style.
Wish i would of watched this video before buying, so i would know NOT to buy this!
holy smokes dude!! can u get to the INSTRUCTIONS? We dont need to hear about zinc!!! 10 minutes? surely this could be a 2-3 minute video- so much unnecessary info kills 99% of peoples ability to concentrate.
Are you nuts...? Gave you read the comments? Not even with his explanation about Zinc people understand hiw it works.....imagine without it 😂😂😂😂😂
TOTALY WASTE OF TIME..