Volframelektroodis

Volframelektroodis, commonly known as a tungsten electrode, is a non-consumable electrode made from tungsten metal. It is widely used in various welding processes, most notably in Gas Tungsten Arc Welding (GTAW), also known as TIG welding. Tungsten's exceptionally high melting point, 3422 degrees Celsius (6192 degrees Fahrenheit), makes it ideal for withstanding the intense heat generated during arc welding without melting or significantly eroding.

Tungsten electrodes are typically used in conjunction with an inert shielding gas, such as argon or helium. This gas prevents atmospheric contamination of the molten weld pool and the electrode itself, ensuring a clean and high-quality weld. The inert gas also helps to stabilize the electric arc.

The performance and application of a tungsten electrode can be influenced by the additives or alloying elements mixed with the pure tungsten. Common additions include thorium oxide, cerium oxide, lanthanum oxide, and zirconium oxide. Each of these additives imparts specific characteristics to the electrode, such as improved arc starting, arc stability, or reduced consumption rate. For example, thoriated tungsten is known for its excellent arc stability and ease of use, while ceriated tungsten is often preferred for low-amperage applications and DC welding. Pure tungsten electrodes are also available and are primarily used for AC welding of aluminum and magnesium. The tip geometry of the tungsten electrode is also important; it can be ground to a point or a rounded end depending on the welding application and the type of current being used.