Methods For Shaping Metals » Forging » Upsetting
Upsetting
Sometimes, Upsetting is called Heading and usually involves locally heating of the end or ends of the material, immediately prior to forging. Poppet valves and forged bolts are formed in this way. Sometimes, this process is done cold (in which case it is referred to as Cold Heading) and some rivet heads are formed in this way.