1.  The main transformer is made of high-quality silicon steel sheet, and the mandatory water-cooling system can increase the out-put power as well as reducing the loss. 2. High-quality cylinder and pneumatic components assure that the pneumatic system can operate smoothly. 3. The new generation numerical controller is simple and reliable, and the network voltage compensation capability is strong. Energy is controlled by thyistor no- touch-point switch, and the power factor can be self-adjusted and controlled. The welding line is smooth and firm. 4. Pulse welding (Pulsed Power, pulsed width, basic value current, crest value current can be adjusted respectively.) can satisfy the high-quality welding requirement. 5. B 1 is cross welding, and 2B is longitudinal   welding.