Chemical Engineering Basics
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

Retained austenite
Martensite formation
Sufficient hydrogen present in the welding arc
Relatively high sulphur content in the base metal

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Chemical Engineering Basics
Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Initiation of crack from below the surface does not occur
Plastic deformation of material does not occur
Initation of crack occurs on the surface of the machine part

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