From Tungsten Electrode to GTAW Equipment – Welding Torch Ⅱ

The article will introduce something (Part two) of GTAW (Gas Tungsten Arc Welding) equipment following the Part one, welding torch, on tungsten electrode, and its details can be seen as following.

The size of the welding torch nozzle which depends on the amount of shielded area desired. The size of the gas nozzle depends upon the diameter of the electrode, the joint configuration, and the availability of access to the joint by the welder. The inside diameter of the nozzle is preferably at least three times the diameter of the electrode, but there are no hard rules. The welder judges the effectiveness of the shielding and increases the nozzle size to increase the area protected by the external gas shield as needed. The nozzle must be heat-resistant, and therefore it is normally made of alumina or a ceramic material, but fused quartz, a high purity glass, offers greater visibility. To reduce turbulence and introduction of contaminated atmosphere into the shielded area, devices can be inserted into the nozzle for special applications, such as, gas lenses or valves to improve the control shielding gas flow. Hand switches to control welding current can be added to the manual GTAW torches. 



 

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