What type of torch is recommended for AC welding on aluminum or magnesium?

For AC welding on aluminum or magnesium, a water-cooled torch is recommended due to its ability to handle higher heat loads more efficiently. AC welding generates a significant amount of heat, especially when working with materials like aluminum, which require a high level of thermal control to achieve optimal weld quality.

Water-cooled torches have a circulating water system that absorbs heat from the torch tip and chamber, preventing overheating and allowing for longer periods of operation without compromising performance. This is particularly important in AC applications because the alternating current generates considerable heat, and maintaining a consistent and manageable temperature is crucial for preventing distortion and ensuring proper weld penetration.

The design of water-cooled torches also allows for a larger tungsten electrode and nozzles, offering better heat dissipation and improved arc stability. This results in cleaner, more precise welds and reduces the risk of damaging the torch or affecting the weld quality. Thus, water-cooled torches are ideal for applications involving aluminum and magnesium, where effective heat management is essential.