Graphite electrode joints are usually made from processed graphite (called isotropic graphite). Isotropic graphite is a high-quality graphite material with uniform properties in all directions. It is produced by subjecting natural graphite to high temperatures and pressures, resulting in a dense, strong material that is highly resistant to thermal and mechanical stress. This makes it ideal for applications requiring high performance and durability, such as electrodes in electric arc furnaces. Isotropic graphite has the characteristics of high electrical conductivity, low thermal expansion, excellent machinability, and good oxidation resistance. These properties ensure graphite electrode joints have excellent electrical conductivity, heat transfer and long service life in harsh environments.

Graphite electrode nipples’ graphite electrodes are processed in three main forms: pressurized vibration method,CNC automatic forming method, and mechanical processing method.

Pressurized vibration method: This method is to put the graphite material into the mold and vibrate it at high frequency under pressure. This helps compact the graphite particles and eliminate any air pockets or voids. Pressure and vibration help achieve a uniform and dense structure of the electrode.

CNC automatic molding method: In this method, a computer-controlled machine is used to shape graphite electrodes. The electrode design is fed into a CNC machine, which then uses a variety of cutting tools and techniques to precisely shape the electrode to the required specifications. This method enables precision and consistency in electrode manufacturing.

Machining method: This method involves the use of mechanical tools such as lathes, milling machines, grinders, etc. to shape and refine the graphite electrodes. The electrodes are mechanically cut, shaped and polished to obtain the required size and surface finish. The method may involve manual operations or the use of automated machinery.