What process uses wire as the electrode while providing shielding gas to prevent contamination?

The process that uses wire as the electrode while providing shielding gas to prevent contamination is MIG welding. In MIG (Metal Inert Gas) welding, a continuous feed of solid wire is used as the electrode, which is melted to form the weld. The shielding gas, typically a mix of argon and CO2, protects the molten weld pool from atmospheric contamination, which is crucial for achieving strong and clean welds.

MIG welding is particularly efficient for automating the welding process and allows for a higher deposition rate compared to other welding methods. The use of shielding gas plays a vital role in preventing oxidation and other contamination that can weaken the integrity of the weld, making it a preferred choice for many applications in modern manufacturing and repair.

This method contrasts with other welding processes like stick welding, which uses a consumable electrode coated with flux, or TIG welding, which uses a non-consumable tungsten electrode and often requires separate filler material. Flux-cored welding, while similar to MIG welding, utilizes a tubular wire filled with flux instead of a solid wire and may or may not require external shielding gas depending on the type of flux used.