Workshop Technology
The advantage of Thermit welding is that

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

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Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
Sand wash is a casting defect which

Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting

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