Question

When welding an inside corner joint, Why is a slightly oxidizing flame used?

1) To prevent oxidation of the metal
2) To increase the strength of the weld
3) To improve the appearance of the weld
4) To reduce the risk of porosity in the weld

Answer 1

A slightly oxidizing flame is used when welding an inside corner joint to prevent oxidation of the metal.

Step-by-step explanation:

When welding an inside corner joint, a slightly oxidizing flame is used to prevent oxidation of the metal. This is because when metal is heated during welding, it can react with oxygen in the air and form oxides on the surface, leading to corrosion and weak welds. By using a slightly oxidizing flame, it creates a protective atmosphere around the weld, preventing the metal from coming in direct contact with oxygen and reducing the risk of oxidation. Therefore, the correct answer to the question is 1) To prevent oxidation of the metal.