Tungsten and molybdenum and all these applications that you don’t know about

Tungsten and molybdenum are commonly used refractory metals and are used as electrode materials in resistance welding because of their high melting point, high hardness and anti-adhesion characteristics. Tungsten and molybdenum also have higher electrical conductivity than metals such as iron. Tungsten lacks plasticity and is brittle at room temperature. Monolithic electrodes made of tungsten rods are suitable only for low-current, low-pressure welding, such as welding small copper alloy parts in electronics; When welding under high current and high pressure, tungsten rod or tungsten sheet is often inlaid on the head of copper alloy electrode to form a composite electrode. In this way, on the one hand, the conductive property of electrode can be improved, the heat dissipation effect of tungsten electrode can be improved, on the other hand, the tungsten electrode can be prevented from being broken by impact during welding. The thermal conductivity, thermal expansion rate and electrical conductivity of molybdenum are similar to tungsten except that the melting point of molybdenum is lower than tungsten. Molybdenum has lower hardness than tungsten, good toughness and easy processing. Molybdenum is used as an electrode in the same way as tungsten, often in combination with copper alloys as Mosaic composite electrodes. The use of pure tungsten or pure molybdenum as electrode inlay is limited by the size of the material, generally can not be made too large, the form of the electrode is also limited, therefore, the use of more or copper-tungsten and silver-tungsten powder sintering materials. As the electrode material of resistance welding, copper tungsten usually contains more than 60% tungsten by weight, and the commonly used varieties are Cu-W70 and Cu-W80.铜焊丝,Copper Welding Rods,铝焊丝,aluminium welding wire,镍焊条,Nickel electrode,药皮焊条,Flux Coated Brazing Welding Rods