Which welding process is performed using the electrode in the torch as the arc and heat source?

• A. TIG welding (GTAW)
• B. MIG welding (GMAW)
• C. Stick welding (SMAW)
• D. Flash welding

Answer: (A)

TIG welding, or Gas Tungsten Arc Welding (GTAW), utilizes a non-consumable tungsten electrode to produce the arc and generate the heat needed for welding. The tungsten electrode is responsible for creating the arc between itself and the workpiece, allowing for precise control of the weld pool and enabling the welder to create high-quality welds with minimal spatter.

In this process, the welder feeds filler material into the weld pool as needed, which is not part of the arc creation itself. The ability to maintain a clean arc with the non-consumable electrode allows for excellent versatility, especially when working with thin materials or in applications requiring high-quality welds, such as in aerospace or critical structural applications.

Other welding processes mentioned have different mechanisms for creating the arc or utilizing electrodes. For example, MIG welding (GMAW) uses a consumable wire as both the electrode and filler material, while Stick welding (SMAW) employs a consumable coated electrode. Flash welding, on the other hand, typically involves joining materials through resistance and heat produced by the flash of current. Therefore, the defining characteristic of TIG welding is its use of the tungsten electrode as the source of the arc and heat for the process, making it