Applying adjustable stroke cylinders for compression to avoid collision and damage of upper an below electrodes Being driven by3-phase stepless speed electrodes, the welding speed adjustment is convenient and stable. longitudinal and horizontal welding is suitble for equipment of different part welding. Smart and reasonable internal structure reduces welding performance weakening due to heat. The rotation conductance of silver axis tile provides excellent cintact and reduces electric energy transformation in maximum Being widely used in hardware,household appliance,auto,basin making ,and making,and other metal manufacturing and reproducing industry.