Which one among the following welding processes uses Non-Consumable Electrodes?

Gas tungsten arc welding processes use non-consumable electrodes. Check more details related to Gas metal arc welding, Submerged arc welding, Flux coated arc welding, etc. below.

Welding Processes use Non-consumable Electrode

A non-consumable tungsten electrode and the component to be welded are brought together by a method called gas tungsten arc welding (GTAW), also referred to as tungsten inert gas (TIG) welding.

Inert Gas in TIG Welding

A layer of inert gas pumped through the GTAW torch protects the heat-affected zone, the molten metal, and the tungsten electrode from ambient contamination.

Inert gas is a substance that lacks or is inactive chemically. The shielding gas serves to cover the weld and keep out the air's active components. Argon and helium are examples of inert gases since they do not mix or undergo chemical reactions.

Submerged Arc Welding

In the process of submerged arc welding, an arc is created between the workpiece and bare consumable electrode wire, which heats up the metal. A layer of granular, fusible flux completely envelops the arc and the weld zone, melting and shielding the weld pool from ambient gases.

The arc is shielded from the gases in the atmosphere by the molten flux that surrounds it. The fresh flux melts all around the arc as the molten flux flows continually downward. The molten flux improves the characteristics of the slag formed when the molten metal reacts with it, and it later coats the molten metal as it is solidifying to shield it from air gas pollution and delay cooling. The figure depicts a submerged arc welding procedure.

Flux Coated Arc Welding or Shielded Metal Arc Welding

A disposable, flux-coated electrode is used in the shielded metal arc welding (SMAW) process to generate an arc between the electrode and the workpiece.

The molten weld metal is shielded from oxidation and the environment by this flux covering. Due to the lack of an external shielding gas employed during this welding process, this is necessary.

Through the electrical arc, molten metal is transferred from the electrode to the workpiece. In addition to melting, the flux covering also surfaces as slag on top of the molten weld pool.

Summary:

Which one of the following welding processes uses non-consumable electrodes?

The welding process that uses non-consumable electrodes is Gas tungsten arc welding which is also called tungsten inert gas. The method to bring the non-consumable tungsten electrode and the component to be welded together is called gas tungsten arc welding.