Workshop Technology
The welding process used to join the ends of two pipes of uniform cross-section, is

Upset butt welding
Projection welding
Spot welding
Seam welding

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Workshop Technology
Notching is the operation of

Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis

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Workshop Technology
A jolt machine is used to

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

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