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Preview File Edit View Go Tools Window Help 2222222222 duc theiv e ceten therma) and chemical resistance 6 Identify the correct statement in the following: a) Copper is extracted using a pyro metallurgical process from bauxite ore b) Brazing uses a copper zinc alloy c) Addition of Sn to brasses severely reducec corrosion resistance d) Copper has high strength to weight ratio, which makes it unsuitable for overhead transmission cables Answer: a) Hot working is carried out by plastic deformation at or near recrystallization temperature b) Swaging is a hot working process that involves extruding material to obtain a desired shape c) Large diameter rollers are used for plate rolling because flatness is desired d) Quarter hard materials can be bent 45 degrees without breaking Answer: a

Explanation / Answer

1

B- copper brazing alloy use for excellent resistance to corrosion and thermal and electrical conductivity

Whereas copper zinc brazing alloy use for there high strength and stress characteristics..and avoid to overheating

2

a-hot working is plastic deformation of metal above recrystallization temtemrature..hot working of steel required 1000°c temrature.hot working use to improve ductility of a material and reduce strength

Hot working of steel is deformation of FCC austenitnite

Dendritic grain structure small gas cavity low porosity Form during solidification....

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