Using lead as a filler to bridge panels, smooth lines true up gaps etc in vehicle bodywork.
im not a real plumber but ive wiped a few lead joints on jobs for plumbers because they cant and have never done one on the mains supply .nowdays they just cut the lead pipe and use a sleeve with a jubily clip to convert to copper and on a friday evening out of town there stuffed if they havent got onePlumbers would be ok, copper irons are really the only way to do metal repairs, a bit of rosin as a flux will help, actually as a thermal joining method, soldering is nearly as involved as some welding processes, and if you ever see a real plumber properly wipe a joint its like a work of art,