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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?

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

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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