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.

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