Metal fabricating and welding glossary - T

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Tack weld

Usually refers to a temporary weld used to hold parts in place while more extensive. final welds are made. In some sheet metal applications, tack gelds may provide sufficient strength to eliminate the need for an "all around" fillet weld.

Tapping

The process of cutting internal threads into a workpiece’s round hole with a multi-point tool to produce uniform helical threads. Depending on the machinery used, either the tap or the workpiece can rotate in relation to the other. A hole smaller than the major diameter of the tapped thread must already have been drilled. See Drilling, Turning, and Milling.

Thickness gage or feeler stock

A hardened and tempered, edged, ground, and polished thin section, high carbon strip steel. Usually ½” in width and in thicknesses from .001 to .050” manufactured to extremely close tolerances. It is used primarily for determining measurement of openings by tool and die makers, machinists, and automobile technicians. It is prepared in handy pocket size knife-like holders containing an assembly of various thicknesses. Also prepared in standard 12” lengths with rounded ends in 10’ and 25’ coils. Universally used in the metal industry.

Thickness

Gauge or depth of material.

TIG or TIG Welding

TIG is short for Gas Tungsten Arc Welding (GTAW). In the TIG welding process, an arc is formed between a non-consumable tungsten electrode and the metal being welded. Gas is fed through the torch to shield the electrode and molten weld pool. TIG is most commonly used in high quality, high precision, welding applications.

TIG weld (Tungsten Inert Gas)

Process using a non-consumable tungsten electrode and a shielding gas, with filler material optional.

Tolerance

The range of variation permitted in maintaining a specific dimension or specification for any characteristic of the product.

Tool

A tangible instrumentality having a surface portion which is designed and intended to engage or react against work with sufficient force to effect an operation of the class type. A core, mandrel, anvil, or the like, which may be "passive" in the sense of supplying only reaction force is included in this definition. The tool may be either transitory or enduring. It may be destroyed in a single use.

Transfer press

A press having an integral mechanism for transfer and control of the workpiece.

Trimming

Definition goes here.

Tumbling

Cleaning articles by rotating them in a cylinder with cleaning materials.

Turning

Another of the old line, basic, machining processes. Turning is also a material removal process in which a single point cutting tool is held parallel to the axis of rotation of a rotating workpiece. Facing is a special case of turning in which the major motion of the cutting tool is at right angles to the axis of rotation of the rotating workpiece. See Drilling, Grooving, Tapping, and Milling.

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