| Tack weld |
A small weld used to temporarily hold together components of an assembly until they can be welded. |
| Tack welding tip |
A pointed tip for a plastic welding torch, used to tack weld plastic weldments. |
| Tail |
The ãVä shape, drawn at one end of a welding symbol, in which special notes are placed. |
| Tank |
A thin-walled container for liquids or gases.Tank walls are thinner than the walls of cylinders used for pressurized gases. |
| Tap |
One of several electrical contacts available on the controls of a resistance welding machine.Each tap provides a different range of amperage for the electrodes. |
| Tap settings |
The various tap positions available on the resistance welding machine. |
| Teach pendant |
An electronic control used to program a robot to perform a series of actions; the sequence of movements is placed in computer memory as a program. |
| Teflon liner |
A smooth seamless tubing used inside a cable to make electrode wire feed more smoothly to a MIG (GMAW) gun.Teflon liners are typically used for feeding aluminum wire. |
| Tempering |
A heat treating process in which metal is heated to a temperature just below its melting point.This heating decreases the metalâs hardness, while increasing its toughness. |
| Tensile shear |
The amount of force required to pull a spot weld apart in a direction perpendicular to the weld axis or ãin shearä. |
| Tensile strength |
The maximum pull stress in psi which a test specimen is capable of developing. |
| Tensile test |
A test in which a specially prepared sample is pulled until it fails.The test determines the weldâs ability to withstand forces that would pull it apart. |
| Terminals |
The physical connectors on a welding machine for attaching the workpiece lead and the electrode lead. |
| Thermal radiation |
Heat rays given off by a welding arc or by the heated base metal. |
| Thermal spraying |
A process in which a material (metallic or nonmetallic) is heated and sprayed onto a surface. |
| Thoria |
An alloying element used in TIG (GTAW) tungsten electrodes to aid in arc starting. |
| Three-Phase Circuit |
Electrical circuit which delivers three cycles within a 360 degree span of time, each cycle is 120 degrees apart. |
| Throat depth |
The distance measured from the center of the electrodes to the frame of the resistance spot welding machine while the electrodes are closed (in contact). |
| Throat of fillet weld |
The distance from the weld face to the weld root. |
| Thumb switch |
A switch mounted on a TIG (GTAW) torch to control the amperage; so-called because it is usually operated by the welderâs thumb. |
| TIG Welding (GTAW or Gas Tungsten Arc) |
Tungsten Inert Gas (TIG) Welding is a process which joins metals by heating them with a tungsten electrode, which does not become part of the completed weld. |
| Tip Flat |
Refers to the geometry of a specific ground end of a tungsten electrode for TIG (GTAW) welding.The tip flat is a small flat face on the end of the ground tungsten electrode.This geometry is recommended for certain welding applications to improve arc starting and to reduce arc wandering. |
| T-joint |
A joint formed by placing one metal against another at an angle of 90 degrees.The edge of one metal contacts the surface of the other metal. |
| Toe of weld |
The junction of the face of the weld and the base metal. |
| Torch |
A device used in the TIG process to control the placement of the electrode, transfer current and direct the flow of the shielding gas. |
| Torch angle |
The angle to the base metal or weld axis at which the torch is held while welding. |
| Torch body |
The main portion of the welding torch, to which hoses and cables are attached. |
| Touch Start |
A procedure for starting TIG welding in which the tungsten is touched to the workpiece and when the tungsten is removed, an arc is established. |
| Toughness |
The ability of material to withstand all types of stresses without tearing or breaking. |
| Track |
A straight or curved guide for an electric motor-driven carriage that carries a cutting torch. |
| Trail Cup
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A special gas cup used in TIG (GTAW) welding of non-ferrous or oxidizing metals to provide additional shield gas coverage over the weld zone as the torch is moved along the weld line. |
| Trail Shield
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| Transferred arc |
An arc that is established and maintained between the electrode and the workpiece. |
| Transformer |
An electrical device used to reduce or increase voltage. |
| Transition current |
The amount of current required to convert from globular transfer to spray transfer. |
| Tungsten |
A metallic element with an extremely high melting point used in making TIG electrodes. |
| Tungsten Grinder |
A device designed to grind the proper geometry onto the end of a tungsten electrode used in TIG (GTAW) welding.Proper electrode grinding and geometry is essential in achieving optimum weld integrity.See Arc-Zone part number···. |
| Tungsten inclusions |
In TIG (GTAW) welding, a weld defect caused by getting tungsten from the electrode in the weld. |
| Two-stage regulator |
A regulator that reduces cylinder pressure in two stages (steps). |
