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Welding Glossary


 * Tack Weld ** - A weld made to hold parts of a weldment in proper alignment until the final welds are made. (2) ** Tack Weld ** - A small weld used to hold pieces of an assembly in place prior to the final (continuous) welding.


 * Taps ** - Connections to a transformer winding, which are used to vary the transformer turns ratio, thereby controlling welding voltage, and current.


 * Temporary Weld ** - A weld made to attach a piece or pieces to a weldment for temporary use in handling, shipping, or working on the weldment.


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 * Thermal Stresses ** - Stresses in metal resulting from non-uniform temperature distribution. throat of a fillet weld.


 * Three-Phase Circuit ** - An electrical circuit delivering three cycles within a 360-degree time span, and the cycles are 120 electrical degrees apart.


 * Throat **
 * ** Theoretical Throat ** . The distance from the beginning of the root of the joint perpendicular to the hypotenuse of the largest right triangle that can be inscribed within the fillet weld cross section
 * ** Actual Throat ** . The shortest distance from the root of a fillet weld to its face.
 * ** Effective Throat ** . The minimum distance minus any reinforcement from the root of a weld to its face.


 * TIG Welding (GTAW or Gas Tungsten Arc) ** - Often called TIG welding (Tungsten Inert Gas), this welding process joins metals by heating them with a tungsten electrode, which should not become part of the completed weld. Filler metal is sometimes used and argon inert gas or inert gas mixtures are used for shielding. For more information on TIG Welding, please see TIG Tech Tips. (2) ** TIG Welding (Tungsten Inert Gas) ** – TIG welding is a welding process where an inert gas protects the molten metal from the atmosphere to produce a high quality weld.


 * T-joint ** . A joint between two members located approximately at right angles to each other in the form of a T.


 * Toe crack ** - A crack in the base metal occurring at the toe of a weld.


 * Toe of Weld - ** The junction between the face of a weld and the base metal.


 * Touch Start ** - A low-voltage, low-amperage arc starting procedure for TIG (GTAW). The tungsten is touched to the work piece; when the tungsten is lifted from the work piece an arc is established.


 * Torch ** - A device used in the TIG (GTAW) process to control the position of the electrode, to transfer current to the arc, and to direct the flow of the shielding gas.


 * Torch Standoff Distance ** - The distance between a nozzle and a workpiece.


 * Tungsten ** - A non-consumable material used in TIG welding to carry current to the weld puddle. (very hard, heavy, steel-grey-to-white transition metal; W in the periodic table.)


 * Travel Angle ** . The angle that the electrode makes with a reference line perpendicular to the axis of the weld in the plane of the weld axis. See also drag angle and push angle.


 * ** Note: ** This angle can be used to define the position of welding guns, welding torches, high energy beams, welding rods, thermal cutting and thermal spraying torches, and thermal spraying guns.


 * Travel Angle (pipe). ** The angle that the electrode makes with a reference line extending from the center of the pipe through the puddle in the plane of the weld axis.


 * ** Note ** : This angle can be used to define the position of welding guns, welding torches, high energy beams, welding rods, thermal cutting and thermal spraying torches, and thermal spraying guns.

**Trigger Reset** - Permits quick reset at gun rather than at machine.


 * Triangle Shirt Waste Factory Fire**

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 * Tungsten ** – Tungsten is a rare metallic element with an extremely high melting point (3410 Celsius). Used in manufacturing TIG electrodes.

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