Cheers. The suggestion of preloading the splines is a great one. Will just have to avoid burnouts in reverse:eek: I'll probably go with a mild preheat of around 100-150 C. Do you think there is much chance of damaging wheel bearings due to welding heat or current? I would remove the flange/shaft imediately after welding so the hub doesnt pull too much heat out too fast - should also stop too much heat getting to the bearings.
Alternatively would another method be to weld a couple of opposing tacks while the shaft/flange is in the hub /splines are preloaded and then remove and finish the full weld with the flange horizontally in the vise? This would also allow a better welding position. I am leaning towards this method.....

