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Which electrode material is used for welding of wrought iron?

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Which electrode material is used for welding of wrought iron?

(a) Cast iron rods

(b) Low carbon steel rod

(c) Mild steel copper coated rod

(d) Low alloy steel rod

I got this question during an interview.

My question is from Welding in division Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

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Right choice is (b) Low carbon steel rod

Explanation: The metal of the electrode depends on the kind of parent metal used. For wrought iron, low carbon steel rods are used. Cast iron rods, mild steel copper coated rods, and low alloy steel rod containing 0.25% carbon are used for cast iron, mild steel, and alloy steel workpieces respectively.

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