What spot welding machine is used for welding aluminum alloy? In the early stages of welding aluminum alloys, three-phase secondary rectification spot welding machines, energy storage spot welding machines, etc. were mostly used, and these welding machines were chosen because aluminum alloys have high conductivity and thermal conductivity. Conventional power frequency welding machines are unable to effectively heat the welding area to a molten or plastic state to form a molten core, and aluminum surfaces are prone to forming oxide films. The melting point of alumina at nearly 2000 degrees is much higher than that of aluminum at 660 degrees. Effectively breaking the oxide layer and heating the welding point becomes the key to choosing an aluminum alloy spot welding machine.
According to Joule's law Q=I2Rt, aluminum alloys have high conductivity and soft texture. Based on Joule's law, spot welding machines need to have a large current output, high thermal efficiency, and relatively less pressure. Unlike conventional soft specifications, spot welding of aluminum alloys cannot use longer welding, but requires a larger current to be applied in a shorter period of time.
The emergence of intermediate frequency inverter DC spot welding machine, with its full wave rectification and DC output characteristics, makes the thermal efficiency and penetration effect extremely high during spot welding. Compared with the half wave rectification of three-phase secondary rectification and the discharge time of energy storage machine, it has formed distinct characteristics, making intermediate frequency inverter DC spot welding machine the best choice for aluminum alloy spot welding since its appearance.
The intermediate frequency inverter DC spot welding machine is the preferred spot welding machine for aluminum alloy welding due to its three-phase balance, DC output, and controllable welding time.
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