(B) of the drug skin
 Electrode drug skin can be referred to as paint, spread it to the solder core is mainly to facilitate the welding operation and to ensure that the deposited metal has a certain composition and performance as Ah. The main role of the drug skin is:
 (!) To ensure that the arc focus, stability, droplet metal easy transition;
 (^) Caused an also hide or neutral atmosphere around the arc to prevent oxygen and nitrogen in the air into the deposited gold dust;
 (^) Generated slag evenly cover the surface of the weld metal, slowing the cooling rate of weld metal and get a good weld profile;
 ("To ensure that the slag melting point, viscosity, density, so that the Welding Electrode can be carried out for all position welding easy to carry out special operations, such as downward vertical position welding;
 (^) Drug skin under high temperature of the arc series metallurgical chemical reaction occurs, with the exception of the too-oxide and 3, "and other harmful impurities can also be added in the appropriate alloying elements to ensure that the deposited metal with the required mechanical properties or other special properties (such as corrosion resistance, heat resistance, wear resistance,
 In addition, a certain amount of iron in the electrode drug skin can be improved welding performance, or mention Gao deposition efficiency. Electrodes drug skin oxides, carbonates, silicates, organics, fluoride, ferro alloys and chemical products can be used hundreds of kinds of raw material powder mixture according to the proportion of a certain formula. Various raw materials in accordance with its role in the Welding Rod drug skin can be divided into the following categories.
 Arc stability agent to make the electrode easy arc in the welding process can maintain stable arc burning. As stable arc agent the materials mostly contain a certain amount of substance of low ionization potential elements, such as rutile, titanium dioxide, ilmenite, ilmenite, feldspar, sodium silicate (containing potassium, sodium and other alkaline earth metal silicate salt〗, in addition to aluminum-magnesium alloy.
 With certain physical and chemical properties of slag welding (Magic slagging agent can be formed to protect the weld pool and improve weld forming slag basicity on the welding performance and weld metal of the physical and chemical properties have a great impact. slagging agent, mostly carbonates, silicates, oxides and fluorides, such as marble, fluorite, dolomite, magnesite, feldspar, white clay, mica, quartz sand, rutile, titanium dioxide, titanium ore, ilmenite, iron ore, and cryolite. some material on the slag viscosity, the fluidity of the thin residue can play a role, such as fluorspar, cryolite, manganese.
 (Magic Deoxidizer through the welding process, metallurgical and chemical reaction to reduce the oxygen content in the weld metal to improve the weld properties, mainly containing oxygen affinity elements ferroalloy and metal powder, such as ferromanganese, silicon iron, neodymium iron, aluminum and iron, magnesium powder, aluminum-magnesium alloy, calcium alloys and graphite.
 ((1) gas agent in the arc under high temperature and can decompose to release gas in order to protect the arc and weld pool to prevent the invasion of Zhou Min limonene gas oxygen and nitrogen. Commonly used gasification agent, carbonate and organic matter. such as marble, dolomite, magnesite, barium carbonate, wood flour, cellulose, starch and resin and so on.
 (^) Alloying agent used to compensate for the burning of alloying elements in the welding process to weld transition alloying elements, to ensure that the weld metal chemical composition and performance. Commonly used in all kinds of ferroalloy and metal powder as an alloying agent, such as ferromanganese, ferrosilicon,
Ferrochrome, molybdenum, vanadium, iron, niobium, iron, boron, iron, manganese, Jincheng chromium, nickel powder, tungsten powder, rare earth ferrosilicon, etc..
 (... By plastic lubricant to increase the plasticity of the process of drug skin powder coated electrode pressure, slip and mobility to improve the quality Xia electrode pressure coated to reduce the eccentricity of these materials Bu often soldiers are Mao - given the expansion of the absorbent shield heart relies on or has a certain degree of flexibility, slip resistance, such as mother, synthetic mica, talc, clay,: -: titanium dioxide, white clay, wood flour, bentonite, sodium carbonate, sepiolite, silk Wan mother. alginic acid salt and ^ (:.
 (!) Binder drug skin powder pressure coating process has a certain viscosity, firmly bonding with the core of the welding and electrode drug skin with Mao certain strength after drying. The main binder of water glass (potassium, steel and lithium water glass] and phenolic resin and so on.
 Of course, the above is only a simple classification of the main role of each material, in fact, a material can have several roles. For example, the marble arc high temperature decomposition of 00 and 00 ^ (^ play a protective role, 00 slag, so the marble made the gas agent and slagging agent. Again, manganese deoxidizer In addition to deoxy excess manganese penetrated welds, since the role of the alloying agent the same time, as deoxidation products from 110 slagging.