Workshop Technology
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

Extrusion
Cold peening
Hot piercing
Cold heading

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Workshop Technology
Shift is a casting defect which

Results in a mismatching of the top and bottom parts of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in general enlargement of a casting
Occurs as sand patches on the upper surface of a casting

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