The welds also tend to actually weaken the material. The weld will basically create a concentration of stress around the area of the weld. If a torsional load is placed on that shaft that is greater than the shaft can take, it will break somewhere around the weld, but the weld will not break. You can have the biggest welds you want, but the heat is what kills the strength of the shaft.

Dan

92 Rodeo, 3.1 TB crank, custom bumpstop spacers, DOR shackles, Flipped ball joints, D44 Rear, 4.56s and new magnaflow cat and dynomax ultraflow muffler Since been replaced by a 2 door Explorer on 31's shackles, cranked torsion bars and full exhaust