DONT weld the bearing in, in order for the bearing to work for an extended period of time it needs to be perfect and true. ive been through the wheel spindle thing many times and it is easiest to buy one off of ebay or find someone online thats parting one out. same thing happened to me. my dad and i cut some sheet steel to fit around the bearing, pressed it together and it lasted all of 1 month. i suppose if you only need it to get by the winter, welding may do just fine. dont over heat it though