Workshop Technology
Cores are used to

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

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Workshop Technology
Spot welding is used for welding

Lap joints in plates having thickness above 3 mm
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
Butt joints in plates having thickness above 3 mm

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