Which of the following welding method uses a pool of molten metal?

A Carbon arc welding
B Submerged arc welding
C TIG arc welding
D MIG arc welding

Correct Answer: Submerged arc welding

This is a well established and extremely versatile method of welding. Submerged-arc welding (SAW) involves the formation of an arc between a continuously fed electrode and the work piece.
A blanket of powdered flux, which generates a protective gas shield and a slag (and may also be used to add alloying elements to the weld pool), protects the weld zone. A shielding gas is not required.
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