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

  2. A.

     Spot welding

    B.

     Seam welding

    C.

     Projection welding

    D.

     Upset butt welding

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    Answer : Option D

    Explanation :

    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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