TIG welding

The tungsten inert gas welding (IG welding) belongs to the group of melt welding processes and is characterized by particularly clean processing, high seam qualities and almost universal applicability in the metal sector.
Due to the particularly precise tuning of the welding current to the respective welding task, the welding method is particularly suitable for root positions and forced positions. For this reason, WIG welding enjoys great popularity in tasks with high standards of precision and seam quality, such as pipeline and apparatus construction, power plant construction and chemical industry.

The construction of a WIG welding system

A WIG welding system consists essentially of a gas supply, a power source, a hose package, the burner and the minus pole. The power source is responsible for generating the voltage required for the ignition of the arc. If the short-circuit-based contact ignition was frequently used earlier, the high-frequency ignition has prevailed today. A high-voltage pulse generator is used to generate the high required voltage and to ionize the gas between the electrode and the workpiece. This procedure achieves a safer and efficient ignition process.

The hose package is not only responsible for the conduction of the welding current, but also includes the guidance of the protective gas and the control line. In the case of larger burners, it is also necessary to provide a cooling system for discharging the resulting process heat. In this case, the hose package also contains the supply and return of the cooling water.

Applications for WIG welding

The WIG welding is mainly used in applications where the requirements for the quality and optics of the weld are very high. These include, inter alia, the following fields of application:

Which protective gas is used?

In WIG welding technology, the protective gas is responsible for protecting and stabilizing the electric arc from the influences of oxygen. The gas thus represents an important basis for the quality of the welds.

The selection of the protective gas is important that it is an inert gas. The inert gases do not undergo any chemical reactions with the materials involved and are therefore ideally suited for use in welding processes.

Due to the cost-effective procurement, the noble gas argon enjoys great popularity during WIG welding. Helium or a mixture of helium and argon is also used in applications with a high desired introduction of heat. If particularly high speeds are desired during welding, hydrogen can also be added in small amounts.

When supplying protective gas, it is important to determine a suitable flow rate. The flow rate depends not only on the material, but also on the desired seam shape of the welding, the welding position and the diameter of the gas nozzle.

Find companies for WIG welding

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