The electrode rod of welding torch should be flat, uniform and clean according to the requirements of neutral standard. According to the relevant public information, the electrode rod of welding gun requires high neutral standard, and the electrode must be flat and even, and there can be no deep creases, bulges and acute angles, which will increase the current density and cause the danger of scalding. The neutral electrode must be clean and free of dirt and inserts, otherwise the contact resistance between the electrode plate and the affected part will increase or the coupling capacitance will decrease, and the high-frequency power loss of the electrode plate will increase. Empirical data show that the loss exceeding 5W is not allowed.