Question

multiple choice question 3 what is the primary purpose of flux in welding? a to increase welding speed b to add filler metal to the joint c to protect the weld from contamination and remove impurities d to increase the heat of the welding arc

Explanation:

• Option A: Flux does not primarily aim to increase welding speed. Welding speed is more related to the welder's technique and equipment settings.
• Option B: Filler metal is added separately (e.g., welding electrodes with filler or separate filler rods), and flux does not add filler metal.
• Option C: Flux in welding is used to create a protective atmosphere, prevent oxidation (contamination) of the weld pool, and also help remove impurities (like slag) from the weld. This matches the primary purpose of flux.
• Option D: Flux does not increase the heat of the welding arc. The heat of the arc is determined by the welding power source and electrode type.

Answer:

C. to protect the weld from contamination and remove impurities