XD-20W digital program-controlled welding power source is composed of control system, power supply system and cooling water tank. It has the characteristics of digitization, easy operation and reliability. The control system adopts an open and upgradeable operating system to centrally set, store, and synchronize and precisely control various functional parameters in all-position welding. This power source is specially designed and manufactured for thin wall tube/tube welding. Mainly used in semiconductor, chemical, food, medicine, electronic pipeline and other industries, The overall design tends to be convenient, energy-saving, intelligent, and human-computer interaction. Compared with the original split type, the volume and weight are reduced by one-third. The integrated design is suitable for the construction where the site space is small。