The electric welder is actually a kind of transformer with reduced external characteristics, which converts 220V and 380V AC into low-voltage DC. The welding machine can be divided into two types according to the type of output power, one is AC; the other is DC. The DC welding machine can be said to be a high-power rectifier, which is divided into positive and negative poles. First, the AC input is converted by the transformer, then rectified by the rectifier, and then the power supply with the falling external characteristic is output, and the output is turned on and off. When there is a huge voltage change, the two poles ignite the arc in the event of an instantaneous short circuit, and use the generated arc to melt the electrode and the welding material, and then cool them to achieve the purpose of combining them. The welding transformer has its own characteristics, and the external characteristic is the characteristic that the voltage drops sharply after the welding rod is ignited.
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