Also not to hi-jack a thread but I was amazed years ago to hear about "spray" welding where they can build up a surface by spraying weld. I'm not sure how they performed the task but what they did was build up the surface of a drag link ball for a hard to find vehicle part, then turn it back to factory specs. From the way he tried to describe it to me it almost sounded like the welding material was literally sprayed onto the item being built up, I was wondering if it worked in a matter similar to powder coat where they use electro-magnetic forces to get the powder to stick to the item being coated. Always fascinated with the welding arts, never mastered, just a jack.