Workshop Technology
The advantage of Thermit welding is that

All parts of the weld section are molten at the same time
All of these
Results in a minimum problem with internal residual stresses
Weld cools almost uniformly

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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
Delivers molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage

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