Steel Searcher-Welding electrode is composed of welding core and coating. Welding Electrode is in the metal core outside the coating (coating) evenly to the heart of the pressure coated on the core. The type of welding electrode is different, the core is different. The welding core is the metal core of the electrode. In order to ensure the quality and performance of the weld, the content of the metal elements in the welding core have strict regulations, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), should be strictly limited and better than the base material.