The electrode welding core and drug skin of two parts. The electrode is outside the core of metal welding, coating (drug skin) uniform pressure applied to the welding core carefully. Different types of electrode welding core. Ie, electrode welding core metal core, in order to ensure the quality and performance of the weld, butt the content of metal elements in the core there are stringent regulations, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), there should be strict restrictions, better than the parent metal. Welding core components directly affect the composition and performance of the weld metal, the harmful elements in theWelding Electrode core to minimize the core of welding carbon steel and low alloy steel welding generally use low-carbon steel welding core, and fill up the manganese silicon, chromium, nickel, and other ingredients (see the wire national standard GB1300 77). The one hand, low-carbon and low carbon content steel wire plastic, easier to wire drawing, on the other hand can reduce the reducing gas CO concentration, reduce spatter or porosity can be increased weld metal solidification temperature, beneficial to the overhead position welding. Adding other alloying elements in order to ensure the comprehensive mechanical properties of the weld, welding performance and to remove impurities, but also have a certain effect. Other high-alloy steel, aluminum, copper, iron and other metal materials, the composition of the solder core addition to asking the weld metal are similar, the same should also control the content of impurities, according to process requirements often by adding certain alloying elements. The electrode is coated with a drug skin for SMAW consumable electrode, which is a medicated skin and Welding Wires  core composed of two parts. Electrode front-end drug skin around the 45 ° chamfer, in order to facilitate arc. Some bare welding core in the tail, about the electrode length of 1/16, to facilitate the welding clamp hold and conductivity. Electrode diameter Chung actually refers to the solder core diameter) is usually 2,2. 5,3. 2 or 3, 4, 5 or 6mm several specifications, it is common 3. 2, 4, 5 its length "L" is generally between 250 ^ -450 mm.