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The welding process used to join the ends of two pipes...

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The welding process used to join the ends of two pipes of uniform cross-section, is

Answer & Solution
Correct Answer: Option D
Upset butt welding is a welding technique that produces coalescence simultaneously over the entire area of abutting surfaces or progressively along a joint, by the heat obtained from resistance to electric current through the area where those surfaces are in contact
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