Welding: arc welding, gas welding basics
Workshop and Manufacturing Practices · Engineering
Study notes
Welding 6 mm steel plates with SMAW at 140 A, 24 V, travel speed 3 mm/s. Heat input = (24 x 140)/3 = 1120 J/mm. Too high causes distortion and a wide heat-affected zone; too low causes lack of fusion. Preheat thick sections to avoid cracking.