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

Projection welding
Spot welding
Upset butt welding
Seam welding

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Workshop Technology
Riddle is used for

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

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