A electrode, called a electrode, is covered in metalCore wireExternal coating (coatedApply evenly and evenly to the core. The core is the electrodeMetal coreIn order to ensure the quality and performance of the weld, there are strict regulations on the content of metal elements in the core, especially on the content of harmful impurities (such as sulfur, phosphorus, etc.), there should be strict restrictions, better thanParent metal.