MIG welding or Metal Inert Gas Welding is a welding process where the electrode is fed into the weld using an electrode gun. When compared with flux welding, MIG welding does not need a flux coated electrode as it uses shield gas to protect the weld pool from outside interference.

High welding speed is achieved in MIG because of its continuous feed electrode.

Generally flux is corrosive but the absence of flux removes the possibility of post weld corrosion.

For routine TIG jobs, cleanliness is not so critical as in MIG welding.

Hence, the correct option is (D).