YP-D45 Ultrasonic Hand-held Plastic Welder Small size and simple operation Safe ... Welding a solid surface YP-D45 28Khz Ultrasonic Hand-held Plastic Welding Machine Used in spot welding,pressure welding,riveting, ... portable ultrasonic welding machines, handheld ultrasonic welding machines, hand-held welding machine, portable welding machine, ultrasonic spot welding, riveting machines, ultrasonic point ...