[1952henry]

V it, and weld it. Make sure good penetration. You can use mig. Used on the 1" thick I -beam dragline booms at work. If mig works on a 300' foot, 300 ton boom supporting a 150 ton load 180 feet out from machine, I think it will work on a lil ol car frame. Oh yeah, this is obviously done by certified welders, with mig and no fish plate.