Which process uses a non-consumable electrode?

Which process uses a non-consumable electrode?

• A. SMAW
• B. GTAW
• C. GMAW
• D. FCAW

Answer: (B)

The key idea is that the electrode remains non-consumable. Gas Tungsten Arc Welding (GTAW) uses a tungsten electrode that conducts the arc without melting into the weld; the filler metal, if added, is fed separately. Shielding gas (usually argon or a mix) protects the weld zone, allowing precise control, which is a hallmark of GTAW. The other common welding processes rely on consumable electrodes: SMAW uses a coated stick that melts and becomes part of the weld, while both GMAW and FCAW use continuous wires that melt into the weld. Because GTAW uniquely uses a non-consumable electrode, it is the correct choice.

The key idea is that the electrode remains non-consumable. Gas Tungsten Arc Welding (GTAW) uses a tungsten electrode that conducts the arc without melting into the weld; the filler metal, if added, is fed separately. Shielding gas (usually argon or a mix) protects the weld zone, allowing precise control, which is a hallmark of GTAW. The other common welding processes rely on consumable electrodes: SMAW uses a coated stick that melts and becomes part of the weld, while both GMAW and FCAW use continuous wires that melt into the weld. Because GTAW uniquely uses a non-consumable electrode, it is the correct choice.