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

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

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Chemical Engineering Basics
In extrusion of metals, which of the following statement is true ?

Hollow ram is used for indirect extrusion
Redundant work is a function of the die angle
Speed of the extruded material is same as that of ram speed
Relative motion between the billet surface and the container wall is always present

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