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Originally Posted by elitecustombody
I'd have to disagree. You're telling me that metal finished MIG wire will have significant enough difference against cold rolled steel in expanding and shrinking at temperature changes ,that it will show through primer and paint?If your theory is true, why I do not see brazed roof & quarter seam on many imports bleeding through? Does brass expand and shrink at same exact rate as steel?
I'm working on 94 Supra at the moment ,replacing one quarter,the seam was brazed with metal finished with zero filler or lead under paint,with less than 1/16" line of brass visible in the actual seam.
I work on and own MKIV Supras and have yet to see one that would show this seam through paint on these cars.
I also have done plenty of antenna,maker light,wipers and various holes shaved over last 22+ years on customer's cars with MIG and have not seen any come back .Can you explain?
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How many black cars have you mig welded the top of the b pillar with a piece of sheet metal, put out in the sun and really scrutinized it looking for a line?
As far as different metal expansion rates, I don't know, I'm not a metallurgist.
I just know what I've seen. I see it a quite often at car shows. Even high end cars. I've actually looked at their build book, looked were they mig welded a panel on, and went to look for the line, and found it. I realize it may not have always been from the heat of the sun though.
On my Nova, someone mig welded a quarter on right under the factory seem for some reason, I cleaned it and re welded it. After the car was done and painted, out in the sun, I could see the line. Ended up putting a full quarter on it, and re-painted the whole body
. I've seen several threads on other sites where things such as this has happened.
If you guys aren't having any come backs, more power to you.
But I will never again put a mig weld in the middle of a panel that faces anywhere near the sky. Especially if it's a dark color.