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This would not become a problem if a standard MIG welder was used? As for the explanation of cracking; I'm guessing that the weld creates a difference in the grain and that area becomes an area that stress concentration could eventually fatigue or break.
I saw a cracked FJ55 axle from the drivers knucke to the drivers spring perch. This happened at SnT because he got well over 5 feet of air. As long as I don't jump it like that I think the welds will be fine.
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