Which is the recommended wire feed speed for 1/8 inch aluminum using the spray method?

The recommended wire feed speed for MIG welding of 1/8 inch aluminum using the spray method falls within the range of 350-400 inches per minute. This speed is optimal for achieving a stable arc, good penetration, and a smooth weld bead when working with aluminum.

In the spray transfer mode, a higher wire feed speed helps to achieve a more fluid and consistent metal transfer, which is crucial when welding aluminum due to its lower melting point and thermal conductivity. The specified range ensures that the aluminum wire heats evenly and transfers effectively without creating excessive spatter or defects in the weld.

Choosing a speed that's too low could lead to poor penetration and a weak weld, while a speed that's too high may cause excessive heat input, leading to burn-through or warping of the material. This balance is crucial for successful MIG welding of aluminum, especially when using the spray arc method for thicker materials.