Workshop Technology
Carburising flame is used to weld

Hard surfacing materials such as stellite
All of these
Steel, cast iron, copper, aluminium etc
Brass and bronze

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Workshop Technology
In permanent mould casting method

Molten metal is poured and allowed to solidify while the mould is revolving
None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is forced into mould under high pressure

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Workshop Technology
During hot working of metals

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

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