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

Upset butt welding
Projection welding
Spot welding
Seam welding

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Workshop Technology
Riddle is used for

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

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