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
Sand wash is a casting defect which

Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting
Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting

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Workshop Technology
Swab is used for

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

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