... life The featuer of welding machine for plastic 1, It is small and convenient for working,Operate flexible and convenient ... coverter.3, Automatic frequency tracking.4, Especially suitable for 1-15mm spot welding.5, Riveting,spot welding,pattern ... for plastic part,screw implanting,rivet joint.8,widely used for welding automotive interior trim and household appliance ultrasonic welding machine for ...