Welding machine refers to the electrical appliances that provide certain characteristics of power supply for welding. The welding is flexible, simple, convenient and reliable, and after welding, even the same strength as the base material is widely used in various industrial fields, such as aerospace, ships, automobiles, containers and so on.

Electric welding machine (electric welding machine) is actually a transformer with declining external characteristics, 220V and 380V AC into low voltage DC, electric welding machine can be divided into two types of output power supply, one is AC power supply; one is direct current. DC welding machine can also is a high power rectifier, positive and negative electrode, ac input, after the transformer voltage, then by the rectifier rectification, then the output has external characteristics of power, output in on and disconnected will produce huge voltage changes, the poles in the instant short circuit ignition arc, using the arc to melt electrode and welding material, cooling later achieve the purpose of combining them. Welding transformer has its own characteristics, external characteristics is the voltage drop sharply after the electrode ignition.

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