Welding drug skin by a variety of raw materials, in accordance with the main component of the drug skin can determine the class of electrode coating Yin. For example, called ilmenite type of drug skin towel ilmenite; scoop drug skin contains titanium dioxide and 30 do more than 20 do the following calcium, magnesium carbonate, known as titanium calcium type. Only low hydrogen type exception, the rejection of natural medicine skin Cao is mainly composed of calcium, magnesium carbonate, and fluorite, but the lowest amount of hydrogen in the weld as its main feature to be named. No drug skin types, use the binder for the potassium silicate (potassium-based potassium and sodium water glass〗 or sodium silicate, the same drug skin types can be further classified as potassium-and sodium , such as low hydrogen potassium type and a low hydrogen sodium plastic. the former can be used for AC and DC welding power source, while the latter can only use the power of the night flow.
 Electrode medicine skin type classification are shown in Table 1-9.
Table 1.9-electrode type of drug skin.
Note: when low hydrogen type coating containing large amounts of stable arc agent 丨 can be used for AC or DC.
Low carbon steel electrode, for example, Table 1-10 lists the typical electrode medicine skin formula For example, Table 1-11 lists the chemical composition of a variety of Welding Rod slag, Table 1-12 lists the chemical composition of the various electrode drug skin . It can be seen from these tables due to different components of drug skin formula, resulting in a variety of drug skin type electrode welding performance, the characteristics of welding slag and weld metal mechanical properties are different. The characteristics of a variety of drug skin type electrode will be elaborated in chapter 6. The graphite type coating, mainly used for cast iron WeldingElectrode and some surfacing electrode; base-type drug skin used for aluminum and aluminum and other nonferrous scrap electrodes.
Example of Table 1.10 Typical electrode medicine skin formula

The classification of the electrode, by end-use and have greater practicality. Current electrode classification, classified in accordance with the uses of the electrode is prepared in accordance with the the electrode national standards and the Ministry of Machinery Industry of the welding materials, product samples.
 Typically, the electrode according to the purpose Ke divided into ten categories, listed in Table 1-13 electrodes major categories of division. The major categories of main performance can also be divided into several subcategories, such as structural steel electrode can be divided into low-carbon steel electrode, the S & P low steel electrode, low alloy of Gao strong steel electrode. Some electrodes at the same time can have a variety of purposes, some stainless steel welding rod, such as six 102 can be used for welding stainless steel components, can be used as Welding Electrodes, surfacing some parts of the surface in a corrosive environment, but can also as a low-temperature steel electrode for welding the structure of work at low temperatures.
Table 1.13 electrode division of categories of
The dimension of the electrode grade is based, such as in pinyin]422.

Four welding rod models and brands
HE number and grades for a Welding Rod, usually to reflect its performance characteristics and category. Electrode model is based on the electrode national standards based on a representation to reflect the main characteristics of the electrode. Model should include the following meanings: Electrode, electrode type, electrode characteristics (such as the deposited metal tensile strength, temperature, type of welding core metal cladding metal chemical composition of type ;) drug skin types and welding power source. Electrode Model 64 315, said electrode; deposited metal tensile strength greater than 43 ^ (/!!! 2 ^ 420 electrode for all position welding; the type of drug skin of the electrode with low hydrogen sodium type can be DC anti-
Then the power. Model table for different types of electrode.
 Electrode grade is the specific naming of the electrode products, developed by the electrode plant, such as welding -12 eight ordinary titanium calcium type low carbon steel electrode, seafood; Tianjin production of "D"; Lanzhou production of "04 -422 ". An electrode grade in long-term use, often with the product quality is good or bad corporate reputation is linked, but many grades gave the user in the selection of inconvenience, since 1968, the welding rod industry began to adopt a unified grades who belong to the same type of drug skin, in line with the same electrode model similar performance unified naming a grade titanium calcium type low-carbon steel electrode such as the production of these plants, unified named .1422 (Results 422> At present, with the deep development of the market economy, in order to break the brand, to strengthen the competitiveness of products, some plants began Jian began the preparation of their own grades, some in the system - grades in front dubbed the corporate name of code, as for〗 422 (it is 4303 〗 ^ 102 electrode, <Zigong> Atlantic are called 0 5:42 and 043 102 (Shanghai>
On the welding company called 3] 422 and 5 mediums mediums six 102 electrode. (Jinzhou> Kam Tai is called X Ding 42 and clever - 308 ^ electrode plant regardless of the grades, the unified grades of the national welding materials industry, must be marked on the product samples or labels of the products are meet the national standard "," quite a country subscript, "or do not add label [that is, with the GB does not match>, so that users combine product performance requirements, control standards go to selection. each electrode products is only one grade, but a variety of brands electrode can at the same time corresponding to at a models.