Glossary and Terms of the Foundry Industry

SFSA: Glossary of Terms - J

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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

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