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Electrodes used in spot welding are made up of which material?

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Electrodes used in spot welding are made up of which material?

(a) Only Copper

(b) Copper and tungsten

(c) Copper and chromium

(d) Copper and aluminium

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The question is from Resistance Welding Methods topic in division Welding and Related Processes of Casting-Forming-Welding II

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Correct option is (d) Copper and aluminium

To elaborate: The electrodes that are employed in the spot welding are required to possess a high amount of electrical and thermal conductivity. Hence, they are primarily made up of copper or copper and tungsten or copper and chromium.

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