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TR2/3/3A “burn through primmer”

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sp53

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Does anyone here use the product called “burn through primmer” I guess it can be painted on both sides of the metal before welding with a TIG. Then I guess you just burn through the primmer and it is no effect on the quality of the weld. I was taught to clean both sides shinny before the weld, but I always thought it would invite rust. Anyways thoughts on this are much appreciated.

steve
 
Steve, for tig welding you are going to find that any kind of primer, be it epoxy, zink, copper, weld thru is going to contaminate your weld. The surrounding area will be protected but the weld zone will be burnt away and not protected. You can only do so much to protect a welded joint. I use zink primer to avoid dissimilar metals. I do plug welds with tig. Clean the primer from the plug area and still it will contaminate the weld. The flanges are protected better than originally but not 100% at weld area. Seam sealer and paint will have to do the rest. Frank
 
Thanks you guys I had never heard of it before, interesting ideas. I should have said MIG--- I am not a TIG welder.
steve
 
I use weld through primer often. It works best with true (resistance) spot welds. When used with other kinds of welds, it will contaminate the weld. As mentioned above, for plug welds, removing the primer in the hole helps a little.

Ed
 
ed_h said:
I use weld through primer often. It works best with true (resistance) spot welds. When used with other kinds of welds, it will contaminate the weld. As mentioned above, for plug welds, removing the primer in the hole helps a little.

Ed
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Can plug welds be Mig welded?
 
Ed is correct in that it works best with (resistance) traditional spot welds. Yes plug welds can be accomplished very easily with a mig welder. A little trial and error with welder setting and hole size can look very much like a spot weld and is very difficult to undo unlike traditional spot welds that can be drilled to remove the weld nugget. Frank
 
I tried it and gave up. It tends to make an ugly bead if you are gas or MIG welding. Plus, most of it burns off anyway, so you lose most of your rust prevention, which is really the only reason to use it to begin with. I have not spot welded with it, so Frank is probably right...it had to be made for spot welding.
 
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