There are three main types of structural AC arc welding machines: moving iron core type, same body type, and moving coil type. It has the advantages of simple structure, easy manufacturing and repair, low cost, and high efficiency. However, its current waveform is a sine wave, and its output is characterized by AC drop. The arc stability is poor, and the power factor is low. However, the phenomenon of magnetic bias blowing rarely occurs, and the no-load loss is small. It is generally used in methods such as manual arc welding, submerged arc welding, and tungsten argon arc welding. Precautions: (1) Arc welding machines should be kept away from flammable and explosive materials; The arc welding machine should be suitable for the installation environment conditions; Arc welding machines should avoid moisture and be able to prevent foreign objects from entering. (2) The shell of the arc welding machine should be reliably connected to a protective conductor; In order to prevent the danger caused by high voltage entering low voltage, a protective conductor should also be connected to one point on the secondary side of the arc welding machine. (3) The rated voltage of the arc welding machine should be consistent with the power supply voltage; The working current shall not exceed the allowable current at the corresponding temporary load rate. (4) The arc welding machine should be connected through terminal blocks; The wiring should be correct and harmful circulation should be avoided. (5) Multiple welding machines should be evenly connected to three-phase power sources as much as possible to maintain three-phase balance. (6) The primary and secondary power lines of the arc welding machine should use copper core rubber cables (rubber sheathed flexible wires); The length of the primary line should not exceed 2-3m. (7) The insulation resistance of the primary and secondary coils of the arc welding machine is qualified. (8) Mobile welding machines must be powered off. (9) In environments with high risk of electric shock, it is advisable to install an automatic arc extinguishing and power off device on the secondary side of the arc welding machine. (10) During arc welding operations, protective equipment such as insulated shoes, gloves, work clothes, and masks should be worn; When working in metal containers, protective equipment such as helmets and elbow protectors should also be worn
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