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Which of the following welding method is not used for salvaging?

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in Casting-Forming-Welding I by (687k points)
Which of the following welding method is not used for salvaging?

(a) TIG welding

(b) MIG welding

(c) Gas welding

(d) Oxy-hydrogen welding

This question was addressed to me in an online interview.

My query is from Salvaging Techniques in section Salvage of Defective Castings of Casting-Forming-Welding I

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Correct answer is (d) Oxy-hydrogen welding

The explanation: In casting processes, there are many occasions on which a lot of material is wasted. Among the following, TIG welding, MIG welding and gas welding, are a few methods used in salvaging welding.

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