... plastic spot welding machine Convenient operation Applicable Scope: riveting, spot-welding, and folder positioning Spot welding machine by hand1, Principle:Principles of ultrasonic welding ... virtue of the energy communicated to the welding head on the plastic piece so that ... . 2, the application scope:Plastic & metal riveting, spot welding, embossing, folders positioning technology. 3, features:1. ...