Workshop Technology
Cores are used to

Form a part of a green sand mould
All of these
Improve mould surface
Form internal cavities in the casting

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Butt joints in plates having thickness above 3 mm

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Workshop Technology
Sand wash is a casting defect which

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

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