Welding core  Welding Wire in accordance with national standards (GB 1300-77) classification for the welding of special steel wire can be divided into the three types of carbon structural steel, alloy steel, stainless steel.
Pressure applied to the surface of the coating of the welded core called coating. The electrode coating plays an extremely important role in the welding process. The use of a drug-free skin, light  Welding Electrodes  in the welding process, the oxygen and nitrogen in the air will be a substantial intrusion of molten metal, oxide and nitride formation of metallic iron and useful elements carbon, silicon, manganese and other various oxides and nitride, and left in the weld, causing the weld slag or cracks. Melt into the molten bath, the gas may cause the weld to produce a large number of pores, these factors can greatly reduce the weld mechanical properties (strength, impact value, etc.), while the weld brittle. In addition to using the optical electrode welding, the arc is very unstable, serious splash, weld forming poor.
  Found in the course of practice outside in the light electrode coated with a layer from a variety of minerals composed of drug skin, make arc stability, weld quality is improved, the electrode is coated electrode. With the continuous development of industrial technology, people created a now widely used in high-quality thick coated electrode.