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Old 11-28-2018, 10:10 AM
RockHillWill RockHillWill is offline
MetalShaper of the Month Jan 2019
 
Join Date: Oct 2009
Posts: 3,089
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Just to add one of my limited experiences with a problem with MIG welding. Prior to getting acquainted with gas welding, I restored a December 1931 Model A pick up with the then new style steel roof. It had very bad drip rails on both sides. The restoration shop that I used had a P9, a fabricated wheeling machine and an Eckold. I thought this was the shop to use, but as I got more into the restoration, I became disillusioned when they wanted to MIG weld the drip rails to the roof section. I had seen many issues with MIG welding while racing the stock cars but wrote it off to being 'rough service life'. They proceeded to over ride my input, but it turned out very nice. That particular truck was entered in five national events and won all five of them, and I was still thinking I did a good job, but after that fifth event I sold it to a Model A collector who took it to a show in Hershey and won some sort of a national award, but merely weeks later the roof cracked on both sides and the buyer was livid with me and I had to dance like hell to avoid a lawsuit. NEVER again for me! Since then I have paid attention and it very common to see cracks in MIG welded sheet metal welds.

This in only my opinion based only on my experience and observations.
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