Metal Pneumatic Spot Welding Machine High Conductivity CCC / ISO Standard DESCRIPTION Firm joint,no black remark, the welding surface is clear. Suitable for welding of multiple types of products. Multiple times of continuous discharging Be able to finish welding at one time No black coating after welding, no oxidation Low cost No need of subsidiary materials Precise mould designed Convenient and simple all-directions adjustment FEATURE Pneumatic Control System: Adopt large