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

For what thickness of a material, in an oxy-acetylene is a welding rod used? Correct Answer 15 mm

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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