One of the main functions of the contact tube is to:

The primary function of the contact tube is to transfer current to the electrode. In welding processes, particularly in gas tungsten arc welding (GTAW) or plasma arc welding, the contact tube is a crucial component that ensures a consistent electrical connection between the power supply and the welding electrode. This connection allows for an effective flow of electric current necessary for establishing the arc, which creates the heat required for melting the metal and forming a weld.

In this context, the transfer of current not only facilitates the welding process but also helps in maintaining stable arc characteristics, ensuring quality welds. Understanding this function is vital for anyone involved in welding, as it directly impacts the efficiency and outcome of the welding operation.