The coating applied to the surface of the core is called the coating.The electrode coating plays an important role in the welding process.If the use of no coating of the light electrode welding, in the welding process, the air of oxygen and nitrogen will be a large number of intrusion into the molten metal, metal iron and beneficial elements such as carbon, silicon, manganese oxidation and nitriding to form various oxides and nitride, and residual in the weld, resulting in weld slag or crack.However, the gas in the molten pool may produce a large number of pores in the welding seam. These factors can greatly reduce the mechanical properties of the welding seam (strength, impact value, etc.), and make the welding seam brittle at the same time.In addition, the use of light welding rod welding, arc is very unstable, serious spatter, weld formation is very poor.People in the practice found that if the light electrode coated with a layer of various minerals and other components of the coating, can make the arc combustion stability, weld quality is improved, this kind of electrode is called the coating electrode.With the continuous development of industrial technology, people created the now widely used high quality thick coating welding rod.

Brazing Alloy