Question

protects the weld from atmospheric contamination; the area of molten metal created during welding; conducts electricity to create an arc; created by the filler metal in the joint; a. electrode; b. weld bead; c. shielding gas; d. weld pool

Explanation:

1. For "protects the weld from atmospheric contamination", shielding gas (c) is used to protect the weld area from air, so match with c.
2. For "the area of molten metal created during welding", weld pool (d) is the molten metal area, so match with d.
3. For "conducts electricity to create an arc", electrode (a) conducts electricity for arc, so match with a.
4. For "created by the filler metal in the joint", weld bead (b) is formed by filler metal, so match with b.

Answer:

1. protects the weld from atmospheric contamination - c. shielding gas
2. the area of molten metal created during welding - d. weld pool
3. conducts electricity to create an arc - a. electrode
4. created by the filler metal in the joint - b. weld bead