Titanium alloys are mainly used for production of aircraft engine compressor components, followed by rockets, missiles and high-speed aircraft structural parts. The mid 60, titanium and its alloys have application in general industry, for the production of electrode for electrolysis, power station condenser, oil refineries and desalination of sea water heaters and pollution control devices. Corrosion resistance of titanium and its alloys have become a structural material. Is also used in the production of hydrogen storage materials and shape memory alloys. Titanium alloys are used in the aerospace industry is a new and important structural material, density, strength and use between the temperatures of aluminium and steel, high strength and excellent resistance to seawater corrosion performance and ultra-low temperature performance. Titanium alloys generally used in Aero-Engine of the structure a total weight of 20%~30%, mainly used in the manufacture of compressor parts, such as forged titanium fan, compressor discs and blades, cast titanium compressor casing, casing, bearing shell, and so on. Spacecraft using titanium alloy with high specific strength, corrosion resistance and low temperature resistance in the manufacture of pressure vessels, fuel tanks, fasteners, instruments, bandages, and the rocket casing. Artificial Earth satellites, lunar module, manned spacecraft and space shuttle use titanium alloy plates welding parts.