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TIG Welding

TIG welding is the welding process which uses heat energy generated when an arc strikes between a non-consumable electrode (pure tungsten or mixed with other alloys) and the pieces to be welded. 
Shielding of the fusion area is afforded by a flow of inert gas supplied via a dedicated nozzle. 
A filler metal is normally used in this welding process, except for with very thin pieces (0.5mm), introduced via welding wands and which are fused, not by the electric arc generated but, by the weld pool. 

TIG welding is a high quality process, but is characterised by low productivity; when used correctly it facilitates welding in all positions and gives excellent control over the weld pool, especially for flimsy and complicated areas.

The development of the use of Argon in high purity mixtures has made welding of all metals possible, with or without a filler material. Furthermore, the introduction of this mixture has enabled the development of new welding generators and meant that welding can now be carried out on previously unweldable materials. 

Thanks to continuous research into and experimentation with TIG technology, SIAD is able to recommend the Stargas® mixture most suited to achieving the best results e.g. increased work speeds, reduction in defects and deformation and safety in the work environment:

  • ARGON S, which is widely used, is not suitable for reactive metals or alloys with controlled percentages of elements.
  • ARGON 5.0, enables high quality welds to be achieved, on particular alloys. It is not recommended for medium and deep thicknesses.

HELISTAR mixtures noticeably increase productivity thanks to an increase in the maximum thickness it is possible to weld in a single pass and to the speed of welding. These mixtures are recommended for light alloys, but can also be used for construction steels and martensitic stainless steels. 

HYDROSTAR mixtures noticeably increase productivity thanks to an increase in the maximum thickness it is possible to weld in a single pass and to the speed of welding. These mixtures are recommended for light alloys, but can also be used for construction steels and martensitic stainless steels.