Coated with a drug for the skin known as arc welding with melting electrode section, referred to as electrodes. Drug by the welding electrode core and skin (coating) composition. Arc welding is usually chamfered end, part of drug skin is removed, exposing the core weld ends, and some arc welding arc-side coated with agents that arc easier. Drugs near the clamp on the skin side of the printed electrode grades.
Electrode was covered medicine bag welding the metal core, said core. Electrode arc welding, the welding between the core and arc welding pieces and melt into the weld filler metal. Welding core both electrodes, is filled with metal. According to national standards GB/1495.7-1999 welded wire and GB/17854-1999 welded stainless steel wire requirement for a dedicated core welding wire (known as wire) into carbon steel, low alloy three types of structural steel and stainless steel. Welding core components will directly affect the weld metal composition and performance, all kinds of Welding Electrodes used in the core (wire) Table 2-1.

Table 2-1 welding of various types of welding used in the core
Electrode types used in welding core
Low carbon steel electrode
Low-alloy high strength steel welding rod
Heat-resistant low-alloy steel electrode
Stainless Steel Electrodes
Electrode surfacing
Cast iron Welding Rods

Non-ferrous welding electrode low carbon steel core (H08A, etc.)
Low-carbon steel or low alloy steel welding core
Low-carbon steel or low alloy steel welding core
Stainless steel or mild steel welding core
Low-carbon steel or alloy steel welding core
Low-carbon steel, cast iron, non alloy welding core
Non-ferrous metal welding core

Solder coating on the surface of the active ingredients as the core drug skin, also known as coating. Drug skin electrode is ore powder, iron alloy powder, organic raw materials and chemical products such as prepared by a certain percentage of the core after the pressure applied to the solder coating on the surface layer. Its role is to:
1, the mechanical protection of the skin electrode melting or decomposition of drugs to produce gas and slag, the absence of air, to prevent the metal droplet and the bath in contact with air. The residue solidified slag shell covering the surface of the weld, the weld metal to prevent high temperature oxidation and nitriding, and slow down the weld metal cooling rate.
2, metallurgical processing and alloy to oxygen through the slag to sulfur, phosphorus removal, dehydrogenase and infiltration alloy welding metallurgical reaction, can remove unwanted elements, adding useful elements, the weld with good mechanical properties.
3, to improve the performance of drug skin welding arc can easily ignite and to ensure a stable continuous combustion; while reducing spatter and improve weld metal transfer and so on.
4, drug skin permeability alloy electrodes containing alloying elements in the transition to a molten bath, you can improve the performance of the weld metal.