... and 20KHz 3.CE and ISO9001 Product NameHigh Performance Portable Plastic Spot Welding MachineProduction indroductionThe welding machine ... loop frequency automatic tracking system,with excellent frequency tracking performance, fast speed and stablity, mainly used for thermoplastic ... industry, home appliances, daily necessities, electronics, auto parts and so on. Successful Cases Bumper Auto Door Plate ...