fixing a bearing on the transmission !!!?

The bearing on the transmission sheive seesed up and wollarded out the transmission case. Do I have to buy a new transmission or can I weld the race and bearing on the side ??? This thing hasn't had 8 tanks of gas run through it. The belt is still good, there was no way to tell the bearing locked up because the race just started spinning. I think this machine is an expensive piece of junk !!!!!!!!!!!!!!