Workshop Technology
Projection welding is a

Process used for joining round bars
Continuous spot welding process
Multi-spot welding process
Arc welding process

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Workshop Technology
Shift is a casting defect which

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

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Workshop Technology
Swab is used for

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

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Workshop Technology
A jolt machine is used to

Produce uniform packing of sand in the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform sand hardness throughout the mould

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