From Tungsten Electrode to GTAW Equipment – Welding TorchⅠ

The article is something Part one) of GTAW equipment, welding torch, on tungsten electrode, and the detail can be seen as below.

Part one
GTAW welding torch is designed for either manual or automatic operation and is equipped with cooling systems using air or water. The automatic and manual torch is similar in construction, but the manual torch has a handle while the automatic torch normally comes with a mounting rack. The angle between the centerline of the handle and the centerline of the tungsten electrode, known as the head angle, can be varied on some manual torches according to the preference of the operator. Air cooling system is the most often used for low-current operations (up to 200 A around), while water cooling is required for high-current welding (up to 600 A around). The torch is connected with cables to the power supply and with hoses to the shielding gas source and where used, the water supply.

The internal metal parts of a torch are made of hard alloys (such as, copper or brass) to transmit current and heat effectively. Tungsten electrode must be held firmly in the center of the torch with an appropriately sized collet, and ports around the electrode provide a constant flow of shielding gas. Collets are sized in accordance with the diameter of the tungsten electrode they hold. The body of the torch is made of heat-resistant, insulating plastics covering the metal components, providing insulation from heat and electricity to protect the welder. 



 

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