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And let us not forget, the arms have to maintain the capability to return to straight, as in after loading a torsion arm with energy and twisting it, after removing the engery, it has to go back from whence it started. Welding is more than likely going to affect that. Torsion arms take constant...

I would reckon those are made out of the same type (and temper) of common car axles. A lot of people don't realize it, but car axles have a "grain" much like wood. They are designed to be strong in the right directions considering the force applied. Probably a cast steel. When you hit it...