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Which of the following is not a material used for making an electrode in metal arc welding, for treating stainless steels?

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Which of the following is not a material used for making an electrode in metal arc welding, for treating stainless steels?

(a) Niobium

(b) Columbium

(c) Titanium

(d) Potassium

The question was posed to me during an online interview.

My question is based upon Welding of Various Metals in portion Welding and Related Processes of Casting-Forming-Welding II

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Correct answer is (d) Potassium

The explanation is: Stainless steels are best welded using the electric butt welding method and then followed by annealing at around 750°C to 800°C. Stainless steels can also be welded using the metal arc welding methods. For this the electrode which is needed is made up of niobium, titanium and columbium. These materials avoid the occurrence of the defect called weld decay.

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