Copy of `Materials engineering group - Welding glossary`

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Materials engineering group - Welding glossary Category: Agriculture and Industry > Welding Date & country: 15/11/2007, UK Words: 121

Stack cutting
The thermal cutting of a stack of plates usually clamped together.

Staggered intermittent weld
An intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the welds on one side lie opposite the spaces on the another side along the joint.

Striking voltage
The minimum voltage at which any specified arc may be initiated.

Submerged-arc welding
Metal-arc welding in which a bare wire electrode or electrodes are used; the arc or arcs are enveloped in a flux, some of which fuses to form a removable covering of slag on the weld.

Surface-fusion welding
Gas welding in which a carburizing flame is used to melt the surface of the parent metal which then unites with the metal from a suitable filler rod.

Sustained backfire
Retrogression of the flame into the blowpipe neck or body the flame remaining alight. Note: This manifests itself either as 'popping' or 'squealing' with a small pointed flame issuing from the nozzle orifice or as a rapid series of minor explosions inside.

Test piece
Components welded together in accordance with a specified welding procedure, or a portion of a welded joint detached from a structure for test.

Test specimen
A portion detached for a test piece and prepared as (Test coupon)

Thermal cutting
The parting or shaping of materials by the application of heat with or without a stream of cutting oxygen.

TIG - welding
Inert-gas welding using a non-consumable electrode (inert-gas tungsten-arc welding)

Toe
The boundary between a weld face and the parent metal or between weld faces.

Tongue-bend test specimen
A potion so cut in two straight lengths of pipe joined by a butt weld as to produce a tongue containing a portion of the weld. The cuts are made so that the tongue is parallel to the axis of the pipes and the weld is tested by bending the tongue round a

Touch welding
Metal-arc welding using a covered electrode, the covering of which is kept in contact with the parent metal during welding.

Tungsten inclusion
An inclusion of tungsten from the electrode in TIG-welding.

Two-stage regulator
A gas regulator in which the gas pressure is reduced to the working pressure in two stages.

Undercut
An irregular groove at a toe of a run in the parent metal, or in previously deposited weld metal, due to welding.

Weld junction
The boundary between the fusion zone and the heat affected zone.

Welding procedure
A specified course of action followed in welding including the list of materials and, where necessary, tools to be used.

Welding sequence
The order and direction in which joints, welds or runs are made.

Welding technique
The manner is which the operator manipulates an electrode, a blowpipe or a similar appliance.

Worm-hole
An elongated or tubular cavity formed entrapped gas during the solidification of molten metal.