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The high-frequency welding machine is a welding machine that uses a high-frequency power supply. It uses the principle of high-frequency induction heating to weld various workpieces such as soil drilling. The high-frequency welding machine does not need to generate high temperature first and then heat the metal object heated by it, as other heating methods, can directly generate high temperature in the metal object. It can not only heat the metal object as a whole, but also selectively heat each part locally and many other functions.