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

Seam welding
Spot welding
Projection welding
Upset butt welding

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Workshop Technology
The purpose of a riser is to

Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal
Deliver the molten metal from pouring basin to gate

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