original_query: What is forge welding and how does it work?
query: What is forge welding and how does it work?
answer: Forge welding is a solid-state welding process that joins two pieces of metal by heating them to a high temperature and then hammering them together, or by using presses to force them together. This creates enough pressure to cause plastic deformation at the weld surfaces, forming a metallic bond between the atoms.  It's one of the oldest welding techniques, used since ancient times.