... annealing; precious metals smelting.Brazing, thermal deformation, hardening, annealing, modulation, and a variety of carbide, ... tools, knives, utensils, agricultural implements, iron and steel, steel, railway equipment, aerospace , weapons manufacturing, electrical manufacturing ... the heat for hot forging, the workpiece surface and hardening, annealing, motors, valves, welding, tungsten, molybdenum ...