Introduction:
An electric welding machine is actually a transformer with descending external characteristics, which converts 220V and 380V AC electricity into low-voltage DC electricity. Welding machines can generally be divided into two types according to the type of output power, one is AC power; One type is direct current. A DC welding machine can also be said to be a high-power rectifier, which divides the positive and negative poles. When AC power is input, it is transformed by a transformer and then rectified by the rectifier. Then, it outputs a power supply with a descending external characteristic. The output end will produce a huge voltage change when connected and disconnected. When the two poles are short circuited in an instant, the arc is ignited, and the generated arc is used to melt the welding rod and material. After cooling, the purpose of combining them is achieved. Welding transformers have their own characteristics, and the external characteristic is the sharp drop in voltage after the welding rod is ignited
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