Workshop Technology
Projection welding is a

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

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Workshop Technology
A jolt machine is used to

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 packing of sand in the mould
Produce uniform sand hardness throughout the mould

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