... and electrical industry, Metal industry and Packaging industry, Cable&wire, Foundry&metal .Tube&pipe, ect. The main ... applications are as following. A: parts surface heating treatment, parts surface hardening, tempering, annealing, etc.B: metal ... frequency shrinkage fitting, heat enveloping, heat sealing, metal desiccating, nut inserting, rotor inserting,etc.D: ...