Torsion Bar Woes... or Woahs
Holy crap!
So many things wrong with that I don’t even know where to start. The welding is terrible, but even great welding wouldn’t have made that a viable repair.
So yeah, looks to me like you need to replace the entire crossmember at least, probably some of th floor too. You’ll have a better chance to look at that without the crossmember in place though, obviously you want to weld the new crossmember to solid metal.