The welding machine is a kind of semi-automatic welding equipment with automatic control of pneumatic pressure. The electrode pressure and working stroke range can be adjusted within the set range. It is mainly used for spot welding and projection welding of various sheet structural parts. It is widely used in auto parts, motorcycle parts, radiator steel radiator, solar water heater, metal packaging container, steel safety filing cabinet, etc. Metal screen filter equipment and other manufacturing industries, welding joints can ensure sufficient welding mechanical strength, random high performance, high reliability of the computer projection welding controller, it can achieve compression, welding, maintenance, rest four in the welding process, single point welding can choose continuous spot welding according to the work requirements. Compared with similar products, it has the advantages of simple and intuitive operation, large output power, fast welding speed and low equipment failure rate, which can meet various welding needs of users