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I | Index | K
J
1) Symbol for 1 gram equivalent weight, 2) the mechanical equivalent of heat.
Jack Arch
A spring arch, flat or horizontal on the underside.
Jamb
Usually an upright structural member forming the side of an opening in a refractory or furnace wall.
Jamb Brick
A brick modified so one corner is rounded.
Jar Ramming
Packing sand in a mold by raising and dropping on a table the sand, pattern, and flask. Jolt squeezers, jarring machines, and jolt rammers are machines using this principle.
Jersey Fireclay Brick
Highly siliceous clay brick, semisilica brick.
Jet Scrubber
IN air pollution control, a high velocity water jet directed into the throat of a venture section of a cupola to separate out particulates.
Jet Tapping
A method of tapping a melting furnace by firing a small explosive charge instead of using an oxygen lance. The tapper consists of an explosive charge enclosed in a plastic case surrounded by a hollow bullet-shaped body.
Jib
Projecting part of crane from which lifting chain or gear is suspended.
Jig
Any device so arranged that it will expedite a hand or a machine operation.
J-Integral
A mathematical expression used to characterize the fracture toughness of a material having appreciable plasticity prior to fracture. The J-integral eliminates the need to describe the behavior of the material near the crack tip. Units are MN/m or in in-lb/in2.
Jobbing Foundry
A foundry engaged in the manufacture of numerous types of castings.
Joint Welding
Production welding used to weld cast components together to obtain an integral unit.
Jolt Ramming
See Jar Ramming
Jolt-Squeezer Machine
A combination machine that employs a jolt action followed by a squeezing action to compact the sand around the pattern.
Jominy Test
See End-Quench Hardenability Test