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For what thickness of a material, in an oxy-acetylene is a welding rod used?

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For what thickness of a material, in an oxy-acetylene is a welding rod used?

(a) 10 mm

(b) 15 mm

(c) 20 mm

(d) 25 mm

I have been asked this question by my school principal while I was bunking the class.

This question is from Oxy-Acetylene Welding in division Welding and Related Processes of Casting-Forming-Welding II

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The correct choice is (b) 15 mm

Easy explanation: Oxy-acetylene processes are mainly used for the joining of metal sheets or for joining metal plates which are having a thickness of 2mm to 50mm. When the thickness of the material is more than 15 mm, an additional filler metal is added like a welding rod.

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