Tungsten contacts are electrical contact materials primarily composed of refractory metal tungsten and other metal elements such as copper or silver, exhibiting excellent thermal, mechanical, and electrical properties, and are widely used in the power sector. Based on their chemical composition, they can be classified into tungsten-copper (WCu) contacts and silver-tungsten (AgW) contacts. 

Depending on their shapes, tungsten-based alloys can be categorized into tungsten alloy rods, tungsten alloy blocks, tungsten alloy plates, and tungsten alloy spheres. While their physicochemical properties are generally similar, their applications differ.

Like tungsten-silver (WAg) contacts, tungsten-copper (WCu) contacts are also a typical type of tungsten contact. Since both tungsten-silver and tungsten-copper contacts are products based on refractory metal tungsten, their physicochemical properties, production methods, and applications are fundamentally similar. It should be noted that the price of silver is generally higher than that of copper.

Tungsten-nickel-iron alloy, with its unique physical and mechanical properties, demonstrates significant applications value in the field of welding electrodes. When used to manufacture welding electrodes, the high tungsten content (typically over 90%) is the core source of its advantages. Tungsten’s melting point, as high as 3422°C, far exceeds that of most metal materials, enabling the electrode to maintain a stable form in the high-temperature arc environment and preventing excessive wear due to melting. This is crucial for ensuring the continuity of the welding process. The addition of nickel and iron effectively mitigates the brittleness of pure tungsten, providing the electrode with a certain degree of plasticity and toughness, making it less prone to cracking during processing, installation, and use, while also enhancing its electrical conductivity to ensure stable arc generation and energy transfer.