... parts, metalwork, Machinery&equipment Industry, electronics and electrical industry, Metal industry and Packaging industry, Cable&wire, Foundry&metal .Tube&pipe, ect. ... parts surface hardening, tempering, annealing, etc.B: metal brazing, high-frequency brazing, pan bottom brazing, ... frequency shrinkage fitting, heat enveloping, heat sealing, metal desiccating, nut inserting, rotor inserting,etc.D: ...