A colourless gas, chemically inactive used for shielding the weld from atmosphere in welding.


Related Terms

SEAL WELD

A weld used primarily to obtain tightness and prevent leakage.

BACKING RING

A strip of thin plate used on the inner surfaces of the abutting ends of pipe, tubes, or plates which are butt-welded. Its purpose is to prevent irregularities at the base weld and to permit penetration at its root.

BUTT WELD

A circumferential weld in pipe fusing the abutting pipe walls completely from inside wall to outside wall.

SOCKET FITTING

A fitting used to join pipe in which the pipe is inserted into the fitting. A fillet weld is then made around the edge of the fitting and the outside wall of the pipe.

CRATER

1) The central magma outlet tube of a volcano. 2) A ground depression caused by explosion, impact or remnant from extinct volcano. 3) A depression in a weld as the result of molten metal displaced from the weld point.

HOSE TEST

The method by which a seam or weld is tested for watertightness, by applying a jet of water from a hose from one side, and checks made from the other side for any seepage, or passage of water.

WELD

A hot melt method of fusing metals.

BEAM CLIP

A device for attaching a pipe hanger to its associated structural beam when it is undesirable to weld the pipe hanger to supporting structural steelwork. Also known as girder clamp; girder clip.

COVER PLATE

A pane of glass in a welding helmet or goggles which protects the colored lens excluding harmful light rays from damage by weld spatter.

MERCURY BAROMETER

An instrument which determines atmospheric pressure by measuring the height of a column of mercury which the atmosphere will support; the mercury is in a glass tube closed at one end and placed, open end down, in a well of mercury. Also known as Torricellian barometer.

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