Workshop Technology
During hot working of metals

Grain structure of the metal is refined
Porosity of the metal is largely eliminated
Mechanical properties are improved due to refinement of grains
All of the listed here

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Workshop Technology
The purpose of a riser is to

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

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Workshop Technology
Notching is the operation of

Bending a sheet of metal along a curved axis
Cutting a sheet of metal in a straight line along the length
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal through part of its length and then bending the cut portion

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Workshop Technology
Linde welding uses

Neutral flame and leftward technique
Oxidizing flame and leftward technique
Neutral flame and rightward technique
Carburising flame and rightward technique

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