How does arc force affect metal deposition in GTAW?

How does arc force affect metal deposition in GTAW?

• A. There is no arc force
• B. It significantly increases deposition
• C. It significantly reduces deposition
• D. It changes the weld bead shape but not deposition

Answer: (A)

In GTAW, the welding arc mainly serves as a heat source and does not shuttle molten metal from the electrode or filler into the weld. The filler metal is added separately by the welder, and the rate of deposition is controlled by how quickly you feed the filler and by the welding current. Because the arc doesn’t exert a force that moves metal into or out of the weld pool in GTAW, arc force has essentially no impact on how much metal is deposited. That’s why the correct view is that there is no arc force affecting deposition in GTAW. The other ideas imply the arc’s pressure would push more or less metal into the weld or change the bead due to arc pressure, which isn’t the case in this process.

In GTAW, the welding arc mainly serves as a heat source and does not shuttle molten metal from the electrode or filler into the weld. The filler metal is added separately by the welder, and the rate of deposition is controlled by how quickly you feed the filler and by the welding current. Because the arc doesn’t exert a force that moves metal into or out of the weld pool in GTAW, arc force has essentially no impact on how much metal is deposited. That’s why the correct view is that there is no arc force affecting deposition in GTAW. The other ideas imply the arc’s pressure would push more or less metal into the weld or change the bead due to arc pressure, which isn’t the case in this process.