Quote:
Originally Posted by hoscalecody
How come the chassis seems to break right beside a weld? Not the weld breaking, but the cage breaking beside the weld at another piece of the frame.
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Because it's 4130 chromoly and most do not weld it properly. Cooling too quickly causes embrittlement and you see the breaks away from the weld joint. It also needs to be preheated to at least 80 degrees before the weld process, I like it even hotter than that. Ideally we would have an oven to preheat it do the welds and then back in oven to post heat.
I'm not an expert but when in welding class many years ago that is what they taught me and I never had tubing failure on any chassis I built or repaired.