TIG welding

The TIG welding process is an autogenous fusion welding process. The electric arc is struck between a non-consumable tungsten electrode, shielded by an inert gas, and the workpiece. Tungsten is used due to its high melting point and excellent thermionic emission properties.

The TIG welding process can be categorized as:

• Manual: Both arc length and torch manipulation are controlled by the welder.
• Semi-automatic: Arc length and wire feed are controlled by the machine, while the welder guides the torch.
• Automatic: All operations are performed by a robotic system or dedicated machinery.

This process provides a stable arc and precise control of the weld pool. However, TIG is a low-deposition (or low-productivity) process, typically used for thin gauges. While All types of metals and non-metals can be welded using a filler rod, the high energy density of the arc also allows for high-quality welds by simply fusing the joint edges without additional material.