... , zinc as well as various noble metals.B. Heat Treatment (surface quench):It is mainly aims to change the rigidity of ... crankshaft, connecting rod, piston pin, chain wheel, aluminum wheel, valve, rock arm shaft, semi drive shaft, small shaft and fork.3 ... blade, hard alloy cutter, milling cutter, reamer, planning tool and solid center bit. 2. Welding of various hardware mechanical gadget: Silver ...