Mild steel – 50 A, 80 A, 130 A, 170 A, 220 A, 300 A, and 460 A – O2/Air Figure 1. Mild steel consumables 50 A – 460 A 1 Shield retaining cap 2 Shield1 3 Nozzle retaining cap 4 Nozzle 5 Swirl ring1 6 Electrode 7 Water tube 1 The bottom part number is for mirror cutting only.