Wrought Copper-Tin Alloy

Copper-tin wrought alloys, also known as tin bronze, are best welded with a TIG process. The phosphorus in the alloy makes the material self-lubricating, but during welding you have to watch out that it doesn't burn out or cause embrittlement. That's why you use a filler material that matches the base alloy in composition and possibly contains some deoxidizer. It's important to control the heat well and not let the part get too hot, otherwise you'll get cracks or a poor weld. After welding, the part should cool slowly so it stays stress-relieved and doesn't crack.