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Gas tungsten arc welding is a process in which the joining of metals is produced by heating therewith an arc between a tungsten (nonconsumable) electrode and the work.
A shielding gas is used, normally argon.
normally done with a pure tungsten or tungsten alloy rod, but multiple electrodes are sometimes used.
The heated weld zone, molten metal, and tungsten electrode are shielded from the atmosphere by a covering of inert gas fed through the electrode holder.
Filler metal may or may not be added. A weld is made by applying the arc so that the touching workpiece and filler metal are melted and joined as the weld metal solidifies.
This process is similar to other arc welding processes in that the heat is generated by an arc between a nonconsumable electrode and the workpiece, but the equipment and electrode type distinguish itfrom other arc welding processes.
See figure 10-32.