... The featuer of portable spot welding gun 1, It is small and convenient for working,Operate flexible and ... frequency tracking.4, Especially suitable for 1-15mm spot welding.5, Riveting,spot welding,pattern welding,dot welding,etc ... spot welding for plastic part,screw implanting,rivet joint.8,widely used for welding automotive interior trim and household appliance portable spot welding gun for sale ...