Workshop Technology
The purpose of a riser is to

Deliver the molten metal from pouring basin to gate
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

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Workshop Technology
Spot welding is used for welding

Butt 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
Lap joints in plates having thickness above 3 mm

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