Question

which of the following correctly describes the role of a filler metal in welding? a to serve only as a shield against contaminants b to generate the electricity that forms the arc c to melt and form part of the final weld d to support the welding machine during operation

Explanation:

Filler metal in welding melts and fills the joint gap, becoming part of the final weld. It doesn't just shield against contaminants (A is wrong), doesn't generate electricity for the arc (B is wrong), and doesn't support the welding - machine (D is wrong).

Answer:

C. to melt and form part of the final weld