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Chickenjohn
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Yes, I use weld thru zinc primer on the inside of box sections, spot/plug welded overlapped joints etc. But I scrape/ sand the zinc off the outside of the area before welding. Best to weld bare steel to bare steel. The "weld thru" primer is best for the bits you can't get to after welding.
Chickenjohn
Morris Minor and Porsche 944 fan
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It will spit and not weld very well. The name of the paint is a bit of a misnomer. It is meant to protect the bits you cant paint after the welding is complete.
Sparkey
Bouncing along!
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Uhm yes, i really think he meant scrape it off because zinc fumes are very toxic!!
Weird actually....a weld thru zinc primer??? You have to put that on AFTER you've welded it or how does it work? (sorry for my daft questions...
)note to self: must type faster....
Chickenjohn
Morris Minor and Porsche 944 fan
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No, you spray parts that are going to be inside of, for example the sill on a car with zinc weld thru primer. Spray before welding as once the box section is closed you cant spray in there!
It is preferable to leaving the inside of box sections as bare metal.
It is preferable to leaving the inside of box sections as bare metal.
Thanks JeanPoulet!
Sphinx
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If you're going to grind the paint back off the areas you're going to weld, like through the hole of a plug weld etc then surely you could just use any old primer as it won't come into contact while welding?
I was under the impression that say for example you have a sheet with a few holes in read for plug welding. The surface you're welding, inside a sill for example that will then be closed up, you spray the weld through primer inside the sill and on the reverse of the plate you're welding in. Then with the plate in place, you'll see primer through the holes which you can plug weld as normal?
I was under the impression that say for example you have a sheet with a few holes in read for plug welding. The surface you're welding, inside a sill for example that will then be closed up, you spray the weld through primer inside the sill and on the reverse of the plate you're welding in. Then with the plate in place, you'll see primer through the holes which you can plug weld as normal?
Chickenjohn
Morris Minor and Porsche 944 fan
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That is right sphinx, the weld thru primer does not burn off like other cheap primers and can be left as the top coat in the sill as Zinc primer does not absorb moisture.
The plug welding holes; if you scratch the zinc primer off just in these holes then the plug welds will work fine. Leave the primer in the holes and you can get spitting.
The plug welding holes; if you scratch the zinc primer off just in these holes then the plug welds will work fine. Leave the primer in the holes and you can get spitting.
mike os
just a little insane.....
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Sparkey
Bouncing along!
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Chickenjohn
Morris Minor and Porsche 944 fan
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Jean Pierre et mon frere! Et J'aime souder mes voitures.
