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

Upset butt welding
Seam welding
Spot welding
Projection welding

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Workshop Technology
Swab is used for

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

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