What mtwalet said is true.....the tube from prior weld has already been welded(which had heat to it) unless it has been nealed which if it is not chromoly more than likely it was just welded......and just rewelding the crack is going to be weak and give you issues,not to mention welding over cracks would make it look like a hat full of smashed a-holes but the sleeve will give it strength , and should be a problem later down the road..hope that helps :mc_smiley: