... through forging press with the help of punch press, forging machine or other equipments, for instances, hot extrusion of watch case ... and motorcycle fittings, such as crankshaft, connecting rod, piston pin, chain wheel, aluminum wheel, valve, rock arm shaft, semi drive ... materials.1. Welding of various hardware cutting tools, such as diamond tool, abrasive tool, drilling tool, alloy saw blade, hard ...