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Electric welding machine is the use of positive and negative poles in the short circuit when the high temperature arc to melt the solder and the welding material, so that the object is the combination of contact. Its structure is very simple, is a large power transformer. Electric welding machine according to the output power can be divided into two types, one is AC power, one is DC power. They use the principle of inductance, inductance in the connection and disconnection will produce tremendous voltage changes, the use of positive and negative poles in the short circuit when the high voltage arc to melt the solder on the electrode, so that they can achieve the purpose of atomic binding.