Helium compressor has compact design, reliable quality, low speed, long service life and no pollution. Helium is an expensive gas and when used, we need to recycle it and refill it into cylinders, especially for helium balloons. Typically, the suction pressure is 0-1bar, the blowing pressure is 200bar, and the flow rate can be 5-20nm3/hr or higher. In the welding of magnesium, zirconium, aluminum, titanium and other metals, helium needs to be used as a shielding gas for welding.