[ttakashima]

Clamp in place on a flat surface, metal tables are best -> Tack a corner -> rework the angle -> tack a second corner -> fix again ->tack a third -> Check again -> finish the weld. This should fix any angle issues. Our drive base is always welded in one pass (~2 hours of welding and reworking angles) and we have not had much of an angle issue over the past 2 years. As for warping, we have had metal bow in on our chassis by about 1/32 inch per 36 inches, just use some heat and bend it back to where you want it.