... Ultrasonic Hand-held Plastic Welding Machine Used in spot welding,pressure welding,riveting,marking,sealing,screw implant, decals fusion welding etc.Widely used in ... together or screw fastening, etc.), with high production efficiency and welding qualitygood, environmentally friendly and energy-saving ... has same strength as the base material). 3.Quality: Finished product is hermetic sealing (airtight and ...