Workshop Technology
The purpose of a gate is to

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

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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 thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having 0.025 mm to 1.25 mm thickness

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