What spot welding machine is used for welding aluminum alloys?

When welding aluminum alloys, the early options often include three-phase secondary rectification spot welding machines and energy storage spot welding machines. These machines are chosen because aluminum alloys have high electrical conductivity and thermal conductivity.

Conventional AC spot welding machines are generally ineffective at heating the welding area to a melting or plastic state to form a weld nugget. Moreover, aluminum surfaces are prone to forming an oxide film. The melting point of aluminum oxide is much higher (nearly 2000 degrees) compared to aluminum’s melting point of 660 degrees. Therefore, effectively breaking the oxide layer and heating the weld nugget becomes crucial in selecting an aluminum alloy spot welding machine.

According to Joule’s Law Q=I²Rt, due to the high electrical conductivity and relatively soft texture of aluminum alloys, spot welding machines need to have a large current output, high thermal efficiency, and relatively low pressure. Unlike conventional soft specifications, aluminum alloy spot welding cannot adopt longer welding times but requires shorter durations with higher current.

With the introduction of medium frequency inverter DC spot welding machines, their characteristics of full-wave rectification and direct current output have significantly improved the thermal efficiency and penetration effect during spot welding. This is in contrast to the shortcomings of semi-wave rectification in three-phase secondary rectification machines and the discharge time of energy storage machines. Since the appearance of medium frequency inverter DC spot welding machines, they have quickly become the preferred choice for welding aluminum alloys.

Let me tell you, due to its balanced three-phase power supply, direct current output, and controllable welding time, the medium frequency inverter DC spot welding machine is the preferred choice for welding aluminum alloys.

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