According GB/T983-1995 stainless steel electrode requirement, stainless steel Welding Rods model based on the chemical composition of deposited metal, drug skin type, welding position, and each type of welding current. The model is prepared: the first letter E said electrodes, E behind the numbers indicate the chemical composition of deposited metal classification code, if the special requirements of the chemical composition, the chemical composition of elemental symbols, numbers on the back ; dash - behind the two figures that the drug skin type, welding position and welding current types.
2. Grades of stainless steel electrode
① grade front of G (or chrome word) or A (or Olympic words), respectively, chromium stainless steel or austenitic chromium-nickel stainless steel Welding Electrodes.
② grades the first number representing the chemical composition of deposited metal mainly composed of class.
③ grades second digit, indicating the same chemical composition of deposited metal mainly composed of different grades in the class. Electrode formed on the same level, can have 10 brands, according to the 0,1,2, ..., 9 order to distinguish between the elements other than nickel-chromium.
④ grades third digit, indicating that drug type and skin type of welding power
3. Choice of stainless steel electrode
Stainless steel electrode for chromium 10.50%, nickel content less than 50% of the corrosion-resistant steel or heat-resistant steel welding, stainless steel material used shall be based on working conditions (including temperature and exposure to media) to select. Mainly from the following aspects:
① In the high-temperature environment of the heat-resistant stainless steel, the main electrode is selected to meet the thermal cracking of weld metal and welding joints of high temperature performance. For the Cr / Ni ≥ 1 of austenitic heat-resistant steel, such as 1Cr18Ni9Ti, Cr17Ni13W, etc., generally are used austenitic - ferritic stainless steel electrode; if the Cr / Ni <1 the stable austenitic heat-resistant steel, such as Cr16Ni25Mo6, Cr15Ni25W4Ti2, etc., should generally be in ensuring the weld metal and base metal have broadly similar chemical composition at the same time, increasing weld metal Mo, W, Mn and other elements in order to improve the weld crack resistance.
② in a variety of corrosive media, the corrosion resistance of stainless steel work should be based on medium and temperature to select the electrode. For the working temperature above 3000C, there is a strong corrosive media, the choice of Ti or Nb stabilized containing elements or ultra-low carbon stainless steel electrode; for media containing sulfuric acid or hydrochloric acid, often used with Mo or with Mo and Cu stainless steel electrode; for work at room temperature, corrosive or only weakly contaminated equipment to prevent corrosion, can be used without Ti or Nb stainless steel welding rod.
③ For chromium stainless steel, such as martensitic stainless steel 1Cr13, ferritic stainless steel 1Cr17Ti etc., in order to improve the welded joints of plastic, with chrome-nickel austenitic stainless steel electrode.
The most creative answer: a, CHE421 the original representation, the reality on the national scale by GB5117 "carbon electrode", and GB5118 "low-alloy steel Welding Rods," the scale, there is a world with a drug for manual arc welding with a skin of carbon steel and low alloy electrodes made of a clear distinction between the same model designation. Second, according to the investigation, 421 electrodes are representations should be E4313, a high titanium steel rod. Herein E is the electrode, 43 indicates the minimum tensile strength of deposited metal, one that combined for all-position welding electrode, said electrode last three titanium calcium type drugs for the skin, can be AC or DC positive and reverse power burn welding. Third, talking about the ordinary electrode, which means the common electrode, that is manual metal arc welding (commonly at the site) is used in welding (in welding core layer of paint on the outside, the exposed part of the tail section for welding clamp clamp). First by the ordinary electrode taken are: (1) for low-carbon steel structure, is generally used titanium calcium type E4303 (J422) or E5023 (J502) electrode; (2) requires plasticity, toughness and high crack resistance major structural parts, use low-hydrogen E4315 (J427) or E5015 (J507) electrode. When using the AC welding machine welding, it can use both AC and DC low-hydrogen E4316 (J426) or E5016 (J506) electrode. (3) requires the U.S. indecent weld surface, smooth sheet metal components, the best selection of titanium E4313 (J421) electrode. (4) can not be good to eliminate rust and other dirt and oil deep melting requires a larger welding components, the best selection of iron oxide-based E4320 (J424) electrode. (5) stand for a large number of welding seam components, on the premises permit, the choice of a special vertical down welding electrodes such as E4300 (J420) electrode. 4, the above is in accordance with the general use to distinguish between those who use the electrode, such as in accordance with sub-diameter electrode, the electrode diameter depends on the thickness determined in the weldment, welding electrodes in accordance with its core size, all divided into two, 2.5,3. Two , 4,5,6 mm so few, is using the most ordinary 2.5,3. Second, the 4 mm 3 species, their parting of welding current of 50 ~ 80A, 100 ~ 130A, 160 ~ 200A. 5 In addition, sending you a knowledge, according to choice of electrode diameter weldment thickness of the method: (1) weldment thickness ≤ 4 mm in diameter across the selected electrode weldment thickness. (2) weldment thickness of 4 to 12 mm, the choice of electrode diameter of 3 to 4 mm. (3) weldment thickness> 12 mm, electrode diameter ≥ 4 mm.