Question

which of the following best describes how the torch and filler rod work together in gtaw to control heat and shape the weld? a the torch provides filler metal while the rod directs shielding gas over the weld. b the torch and filler rod are both placed in the weld joint to form a mechanical bond without heat. c the torch melts the base metal and the filler rod is dipped into the arc to add material as needed. d the filler rod melts the base metal while the torch cools the weld pool.

Explanation:

In GTAW (Gas Tungsten Arc Welding), the torch generates an arc to melt the base metal. The filler rod is manually dipped into the molten weld pool (formed by the arc) to add material as needed, controlling the weld's shape and heat distribution. Option A is incorrect because the torch provides the arc, not filler metal, and shielding gas is directed by the torch, not the rod. Option B is wrong as GTAW requires heat for fusion, not a mechanical bond without heat. Option D is incorrect because the torch melts the base metal, not the filler rod, and the torch does not cool the weld pool.

Answer:

C. The torch melts the base metal and the filler rod is dipped into the arc to add material as needed.