... spot welding machine Convenient operation Applicable Scope: riveting, spot-welding, and folder positioning 28k Ultrasonic plastic spot welding machine1, 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. ...