... straight shank twist drill hot upsetting, hot rolled.B, metal materials annealing. Such as: steel pipe stretch, bend, ... pneumatic components, steam, rubing matching, and other machinery and metal parts surface, hole, partial or whole quenching. Such as ... tools, cutting tools and welding; Brass, copper, stainless steel metal materials of the compound welding.4, metal smelting: melting gold, silver ...