Which type of arc welding is known for using a non-consumable tungsten electrode?

The type of arc welding that utilizes a non-consumable tungsten electrode is Gas Tungsten Arc Welding (GTWA), also known as Tungsten Inert Gas (TIG) welding. In this process, the tungsten electrode is used to create the weld pool, and because it does not melt during the welding process, it remains intact throughout the operation. The heat generated by the electric arc between the tungsten electrode and the workpiece melts the base metal, and filler material can be added separately if needed.

This method is particularly useful for welding thin materials and is known for producing high-quality, clean welds with excellent control over the welding parameters. The inert gas, typically argon or helium, protects the weld area from atmospheric contamination, ensuring strong and durable welds.

Understanding the characteristics of GTWA is crucial for recognizing its suitable applications compared to other welding processes, which rely on consumable electrodes or different mechanisms. This knowledge enhances the ability to select the appropriate welding technique for various structural applications in accordance with the Los Angeles City Structural Welding Code.