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What is TIG welding?

Issuing time:2019-06-14 00:00

TIG welding description

The arc welding process under a protective gas protectorwith a non-consumable electrode, also called TIG (Tungsten Inert gas) uses anelectric arc as the energy source and this is established between the non-consumableelectrode and the actual part being welded, while an inert gas protects themolten pool. When filler material is used, it is supplied by means of rods asin oxyacetylene welding.

During this process, the TIG torch must be connected tothe negative pole (-) and the ground clip must be connected to the positivepole (+).

Aplications

The TIG process can be employed in the welding of allmaterials, including aluminium, magnesium and materials that are sensitive tooxidation, such as titanium.

It is a mainly manual process, with a lower depositionrate compared to other processes and for this reason it usually employed inapplications that require a visually perfect finish.

The possibility of welding one material to another willdepend on the characteristics of the available equipment. The TIG process canbe used with both DC and AC power supplies. The choice of power type andpolarity is made according to the material to be welded.

Weldingequipment The basicequipment for TIG welding consists of a power source, a TIG torch fitted with a nonconsumable tungsten electrode, a ground clip and a bottle of inert gas(almost always   100% ARGON).

TIG torch

This conductsthe current and the protective gas to the welding area. The tungsten electrode,which carries and maintains the current up to the welding zone, is firmly heldin place by a clip housed inside the electrode-carrier body.

The protectivegas reaches the welding area through a ceramic nozzle that is fitted to theelectrode-carrier head. This nozzle directs and distributes the protective gasover the welding zone.

Groundclip The correctconnection of the ground clip is of extreme importance. The location of thecorresponding cable is especially relevant in the welding process. A poorlyfastened cable cannot provide a constant good electrical connection and couldeasily heat up, leading to a break in the circuit and consequent loss of arc.

The ground clipcontact area must be thoroughly clean and free from any substances that could prevent good contact, such as paint, varnish, oils....

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