Final answer:
The purpose of flux or shielding gas in welding is to prevent oxidation and enhance conductivity.
Step-by-step explanation:
The purpose of flux or shielding gas in welding is to prevent oxidation during the welding process. When metal is heated to high temperatures during welding, it can react with the oxygen in the air and form oxides, which can weaken the weld. Flux or shielding gas creates a protective barrier around the weld, preventing oxygen from coming into contact with the metal and reducing the formation of oxides.
Additionally, flux or shielding gas can also help to enhance conductivity. It improves the flow of the electric current through the welding process, leading to better overall performance.