... welding machine adopt closed negative feedback loop frequency automatic tracking system,with excellent frequency tracking performance, fast speed and stablity, mainly used for ... parameterstypeKCH-1520frequency20KHzpower1500Wsize400*160*290mmweight13kgApplicationUsed in spot welding,pressure welding,riveting,marking,sealing,screw implant, decals fusion welding etc, Widely used in stationery industry ...