Basic coated stainless steel electrode and the acidic drugs leather two major categories. Basic coated stainless steel electrode with stomatal sensitivity, stable alloy composition and excellent mechanical properties and welding performance characteristics; the acidic drugs leather type stainless steel electrode with the medicated skin resistance redness and excellent mechanical properties and welding performance . Models and optional stainless steel electrode (1) stainless steel electrode models GB/T983-1995 "provisions of the stainless steel electrode, stainless steel electrode model based on the chemical composition of the deposited metal the drug skin types, welding position and the welding current by type. Method for the model: the first letter "E" electrode "E" behind the digital representation of the deposited metal chemical composition classification code, and if there are special requirements for the chemical composition, the chemical composition of the element symbols, on the back of digital ; dash "-" the two digits of the back the drug skin type, welding position, and the types of welding current. (2) stainless steel electrode grades 1 grade in front of the "G" (or "chrome" word) or "A" (or the word "Olympic"), chromium stainless steel welding rod or austenitic chromium-nickel stainless steel electrode, respectively. ② grades first digit indicates the level of deposited metal chemical composition as shown in Table 10-2. The ③ grades second digit, and said the same deposited metal chemical composition of different grades in the grade. Level electrode of the same composition, may have 10 grades, press 0,1,2, ..., 9 sequentially arranged in order to distinguish the nickel chromium outside other ingredients. ④ grades third digit, said drug skin types and types of welding power source (3) selection of stainless steel electrode The welding of the stainless steel electrode suitable for the chromium content is greater than 10.50%, the nickel content is less than 50% of the corrosion-resistant steel or a heat resistant steel, stainless steel material, the working conditions (including temperature and contact medium) should be used according to choice. Mainly considered from the following aspects: ① to work in a high-temperature environment, heat-resistant stainless steel, that the selection electrode is able to meet the high temperature performance of the thermal crack properties of the weld metal and the welded joints. Austenitic heat-resistant steel for Cr / Ni ≥ 1, 1Cr18Ni9Ti, Cr17Ni13W generally are made of austenitic - ferritic stainless steel electrode; if Cr / Ni <1 stable austenitic heat-resistant steel, such as the Cr16Ni25Mo6, Cr15Ni25W4Ti2, should generally be similar in chemical composition of the base metal at the same time, ensure that the weld metal has to increase the content of Mo, W, Mn, and other elements in the weld metal to weld cracking. Work (2) in a variety of corrosive media, corrosion resistant stainless steel, welding rod should be selected according to the media and working temperature. Working temperature of 3000C or more, there is a strong corrosive medium, the selection contains elements of Ti or Nb stabilized or ultra-low carbon stainless steel electrode; medium containing dilute sulfuric acid or hydrochloric acid, often used with Mo with Mo and Cu stainless steel electrode; work at room temperature, corrosive weak or just avoid rust pollution equipment, can be used without Ti or Nb stainless steel electrode. ③ For chromium stainless steel, martensitic stainless steel 1Cr13, ferritic stainless steel 1Cr17Ti, chrome-nickel austenitic stainless steel electrode in order to improve the ductility of the welded joints,