Electrode is a coating (flux coating) evenly and concentrically pressed onto the welding core outside the metal welding core. The welding core is the metal core of the electrode. In order to ensure the quality and performance of the weld, strict regulations are imposed on the content of each metal element in the welding core, especially strict limits should be placed on the content of harmful impurities (such as sulfur, phosphorus, etc.), which are superior to the base metal.

Electrode is formed by evenly and concentrically pressing the coating (flux coating) onto the welding core outside the metal welding core. The welding core is the metal core of the electrode. To ensure the quality and performance of the weld, strict regulations are imposed on the content of each metal element in the welding core. In particular, strict limits should be placed on the content of harmful impurities (such as sulfur and phosphorus), which should be superior to that of the base metal. The electrode consists of two parts: the welding core and the flux coating. The electrode is formed by evenly and concentrically pressing the coating (flux coating) onto the welding core outside the metal welding core. Different types of electrodes have different welding cores. The welding core is the metal core of the electrode. To ensure the quality and performance of the weld, strict regulations are imposed on the content of each metal element in the welding core. In particular, strict limits should be placed on the content of harmful impurities (such as sulfur and phosphorus), which should be superior to that of the base metal. The composition of the welding core directly affects the composition and performance of the weld metal, so the harmful elements in the welding core should be minimized as much as possible. For the welding cores used for welding carbon steel and low - alloy steel, low - carbon steel is generally selected as the welding core, and components such as manganese, silicon, chromium, and nickel are added (see the national standard for welding wires GB1300 - 77 for details). The reasons for using low - carbon steel are as follows: on the one hand, when the carbon content is low, the wire has good plasticity and is easier to be drawn; on the other hand, it can reduce the content of reducing gas CO, reduce spatter or porosity, and increase the solidification temperature of the weld metal, which is beneficial for overhead welding. The addition of other alloy elements is mainly to ensure the comprehensive mechanical properties of the weld, and also has a certain effect on the welding process performance and impurity removal. For high - alloy steel and other metal materials such as aluminum, copper, and cast iron, in addition to requiring that the composition of the welding core is similar to that of the welded metal, the content of impurities also needs to be controlled, and certain specific alloy elements are often added according to the process requirements.