Which process uses a non-consumable tungsten electrode?

Which process uses a non-consumable tungsten electrode?

• A. Gas Tungsten Arc Welding
• B. Gas Metal Arc Welding
• C. Flux-Cored Arc Welding
• D. Shielded Metal Arc Welding

Answer: (A)

Gas Tungsten Arc Welding uses a non-consumable tungsten electrode. In this process, the arc is drawn between the tungsten tip and the workpiece, and the tungsten electrode itself does not melt into the weld. A separate filler rod can be added as needed, and shielding gas (such as argon or a mixture) protects the weld pool. The tungsten’s very high melting point keeps its shape and provides a stable, precise arc, which is ideal for welding thin sections and demanding joints. In contrast, the other common welding processes rely on consumable electrodes that melt to supply filler metal: a continuously fed metal wire in gas metal arc welding, a flux-core wire in flux-cored arc welding, and a coated stick electrode in shielded metal arc welding. These electrodes are designed to melt and become part of the weld, which is why they aren’t using a non-consumable tungsten electrode.

Gas Tungsten Arc Welding uses a non-consumable tungsten electrode. In this process, the arc is drawn between the tungsten tip and the workpiece, and the tungsten electrode itself does not melt into the weld. A separate filler rod can be added as needed, and shielding gas (such as argon or a mixture) protects the weld pool. The tungsten’s very high melting point keeps its shape and provides a stable, precise arc, which is ideal for welding thin sections and demanding joints.

In contrast, the other common welding processes rely on consumable electrodes that melt to supply filler metal: a continuously fed metal wire in gas metal arc welding, a flux-core wire in flux-cored arc welding, and a coated stick electrode in shielded metal arc welding. These electrodes are designed to melt and become part of the weld, which is why they aren’t using a non-consumable tungsten electrode.