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

Upset butt welding
Spot welding
Seam welding
Projection welding

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Workshop Technology
Riddle is used for

Cleaning the moulding sand
Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of moulding box
Moistening the sand around the edge before removing pattern

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