upset

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upset

1. a tool used to upset a bar or rivet; swage
2. a forging or bar that has been upset in preparation for further processing

upset

[′əp‚set ( noun ); əp′set ( verb )]
(engineering)
To increase the diameter of a rock drill by blunting the end.
(materials)
A defect occurring in timber as a result of a severe blow that breaks the fibers across the grain of the wood.
(metallurgy)
A localized increase in the cross-sectional area of a metal during working, caused by the application of pressure; enables a head to be formed on fasteners such as bolts.
(mining engineering)
A narrow heading connecting two levels in inclined coal.
A capsized or broken skip.

upset

1. To shorten and thicken by hammering, as a bar of heated metal struck on the end.
2. In the region of a weld, a localized increase in volume resulting from the application of pressure.
3. A defect in timber due to a severe blow that breaks the fibers across the grain.