... frequency automatic tracking system,with excellent frequency tracking performance, fast speed and stablity, mainly used for ... 1520frequency20KHzpower1500Wsize400*160*290mmweight13kgApplicationUsed in spot welding,pressure welding,riveting,marking,sealing,screw implant, decals fusion welding etc, ... application and stable and reliable operation. High Performance Handheld Plastic Spot Welding Machine