Final answer:
The difference between pushing and pulling techniques in MIG welding lies in the torch orientation: pushing (forehand) has lower penetration and better visibility, while pulling (backhand) offers deeper penetration and a narrower bead.
Step-by-step explanation:
When engaging in MIG welding, the distinction between pushing and pulling techniques relates to the orientation and direction of the weld torch in relation to the direction of weld travel. Pushing, also known as the forehand technique, involves the nozzle being directed towards the direction of the welding, allowing for a lower penetration and a wider, flatter bead, often providing better visibility and gas coverage.
On the contrary, pulling, or the backhand technique, means dragging the torch back away from the direction of the weld, resulting in deeper penetration and a narrower bead, which can be beneficial for thicker materials but may reduce visibility and gas coverage.