AG Mechanics CDE Practice Exam

The external material on electrodes that remove impurities from the base metal is called:

1. bead

2. electrodes

3. flux

4. tensile strength

The correct answer is: flux

Flux is the correct answer because it is the external material that is applied to the surface of the base metal and the electrode during welding. Flux helps to remove impurities from the metal surface, prevent oxidation, and facilitate the welding process by creating a protective barrier. This improves the quality and strength of the weld by ensuring a clean metal-to-metal bond. The other options are not correct because: - Bead refers to the deposit of filler material created during welding. - Electrodes are the conductive rods used to carry the electrical current needed for welding. - Tensile strength is a measure of the maximum stress that a material can withstand before breaking.