What is the typical current range for 20 gauge steel when using spray transfer?

When welding 20 gauge steel using the spray transfer method, the typical current range falls between 70 to 80 amps. This range is optimal for creating a stable arc and effective heat management, which is essential for achieving good penetration and minimizing distortion in thin materials like 20 gauge steel.

Spray transfer requires a higher current compared to other transfer methods because it needs sufficient heat to melt the electrode and the workpiece simultaneously while maintaining the molten droplets in the arc. Operating within this specified current range allows for the transfer of molten metal droplets across the arc, which is crucial for achieving the desired weld bead profile and minimizing spatter.

For thinner materials like 20 gauge, using currents below this range could result in poor fusion, while exceeding it may cause burn-through or warping due to excessive heat. Therefore, the choice of 70 to 80 amps is specifically tailored for effective and efficient welding of 20 gauge steel using spray transfer.