Tungsten Inert Gas (TIG) welding is a type of arc welding that uses a non-consumable tungsten electrode to produce the weld. The tungsten electrode is a small, pointed metal rod that is used to form an arc between itself and the workpiece. The welding process takes place in an atmosphere of argon or helium, which protects the weld from contamination and oxidation.
TIG welding became popular in the 1940s for joining magnesium and aluminum because it was a highly attractive replacement for other welding methods. Instead of using slag to protect the weld, TIG welding uses an inert gas shield, which results in a higher-quality weld.
This has made TIG welding a major player in the acceptance of aluminum for high-quality welding and structural applications.
The TIG welding process is known for its precision and high-quality results. The small, intense arc produced by the pointed tungsten electrode is ideal for precise welding, and the non-consumable electrode means that the welder does not have to balance the heat input from the arc as the metal is deposited.
When filler metal is required, it must be added separately to the weld pool. TIG welding is considered one of the most versatile welding processes because of its ability to handle a wide range of metal thicknesses and its ability to produce high-quality, precise welds.
TIG welding is commonly used in a variety of applications, including aerospace, automotive, and construction. It is also used in the fabrication of ornamental metal products and in the repair of damaged metal products. TIG welding is especially useful in applications where high precision and a visually appealing finish are important.