YP-D45 Ultrasonic Hand-held Plastic Welder Small size and simple operation Safe, stable and reliable ... solid surface YP-D45 28Khz Ultrasonic Hand-held Plastic Welding Machine Used in spot welding,pressure welding,riveting,marking,sealing, ... welding machines, hand-held welding machine, portable welding machine, ultrasonic spot welding, riveting machines, ultrasonic point welder, can be used for the ...