Models of Welding Electrodes and use of structural steel, for example: grades, the preparation method. Became structural steel welding rod, 3 figures, on behalf of the drug skin type, welding current requirements 1 and 2: on behalf of the tensile strength of the weld metal (2) electrode model Rod models according to the national standards with international standards determined. Structural steel, for example, model preparation method for the letters that welding rod, first, the two deposited metal minimum tensile strength of the third digit welding rod welding position, third, four-digit number indicates the type of welding current and medicated skin type 4. electrode classification according to different situations, welding, there are three classifications: electrode purpose classification, the main chemical ingredient of the drug skin classification, drug skin melted slag characteristics are classified in accordance with the use of welding rod, two kinds of forms of expression, for the preparation of the former Ministry of Machinery Industry, the welding rod can be divided into: structural steel welding rod, heat-resistant steel electrode, stainless steel electrode, welding electrodes, low temperature steel electrodes, cast iron Mig Welding Rod, nickel and nickel alloy electrode copper and copper alloys, aluminum and aluminum alloys and special purpose welding rod. Second is the national standard for carbon steel electrode, low alloy electrode, stainless steel electrode, welding electrodes, cast iron welding rod, copper and copper alloys, aluminum and aluminum alloys. There is no difference in principle between the two, the former commercial grade, which is classified according to the chemical composition of the electrode coating, welding electrodes can be divided into: titania type electrode, titanium calcium type electrode, ilmenite Model type electrode, iron oxide type electrode, cellulose-type electrode, low hydrogen electrodes, graphite electrodes and base electrodes classified in accordance with the melting of the electrode covering slag characteristics, the welding rod into the acid electrode and alkaline electrode. Acid electrode drug skin main ingredients of the acidic oxides such as silica, titanium dioxide, sesquioxide, iron, etc.. The main component of the alkaline electrode drug skin of alkaline oxides, such as marble, fluorite and other welding cored electrode is drug purses overlying metal core is called a core wire. The core wire is typically one having a certain length and diameter of the wire.