In welding, electrodes are the core material for establishing the arc, conducting energy, and forming the weld pool. 

In welding processes, especially those requiring a stable, high-temperature arc, such as argon arc welding (TIG) and plasma arc welding, the electron emission capability of the electrode plays a central role in the efficiency and quality of the welding process. 

In modern welding processes, especially in high-precision applications like TIG (gas tungsten arc welding) and plasma welding, an electrode's arc starting performance is a crucial parameter for evaluating its quality. Arc starting performance directly impacts the smoothness of the welding operation, the quality of the weld's initial formation, and the stable operation of automated welding systems. 

In high-precision welding techniques like tungsten inert gas welding (TIG), electrodes, as core components for arc generation and energy conduction, play a decisive role in welding performance. Among the many tungsten-based materials, pure tungsten has long been widely used, playing a particularly important role in early welding processes.