Guangdong stainless steel Welding Electrodes can be divided into chromium and chromium-nickel stainless steel welding rod, these two types of electrodes in the country who meet the target, according to the provisions of the national standard GB/T983-1995 assessment. Chromium-chromium stainless steel electrodes for use with some corrosion (oxidizing acids, organic acids, cavitation) heat and corrosion resistance. Usually selected as power plants, chemical, oil and other equipment and materials. However, under normal circumstances chromium stainless steel weldability is poor, should pay attention to welding, heat treatment conditions and appropriate choice of electrodes. 1, martensitic stainless steels: Martensitic stainless steel including chromium 5 ~ 9% chromium steel and chromium in 12% of high chromium steel. Tendency of such a large hardened steel after welding is easy to produce high hardness of martensite and bainite that fragility, residual stress is also large, prone to cold cracking. It generally must be preheated before welding and insulation layer, the cooling after welding has not been before tempering. 2, 13 chromium stainless steel welding: Such hardening of chromium steel after welding large, easy to crack, the use of similar chromium stainless steel electrode (A202, A207) welding, you must be over 300 ℃ 700 ℃ preheating and post-weld tempering about slow cooling process. If the weldment after welding can not be processed, the application of chromium stainless steel electrode (A107, A207), such as welding. 3, 17 chromium stainless steel welding: Such chromium steel is usually to improve weldability and corrosion resistance and increase the amount of stabilizing elements titanium, niobium, molybdenum, chromium weldability than 13 steel as well, can be the same type of chrome Stainless steel electrodes (A302, A307) welding. Before welding, weldment should be about 200 ℃ preheating, soldering about 800 ℃ after the tempering treatment. Cr-Ni stainless steel electrode also can be used (such as A107, A207), without heat treatment after Tungsten Welding Electrode. Cr-Ni stainless steel electrode for use Cr-Ni stainless steel electrode has good corrosion and oxidation resistance, it is widely used in chemical, fertilizer, petroleum, food, medical equipment manufacturing. In recent years, as China's industrial development, chrome-nickel stainless steel electrodes have been over thirty varieties, basically meeting the needs of our construction.
① welding rod must be dry, well-ventilated indoor warehouse storage. Electrode storage bank, is not allowed to place harmful gases and corrosive media. Electrodes should be placed on the ground and not less than 300mm from the wall surface of the shelf, to prevent moisture.
② when the electrode should be stacked type, grade, batch, storage time, classification specifications and stacked, and should be clearly marked to avoid confusion.
③ a rod out of the library is generally not more than two days the amount of the amount of Welding Electrodes have been out of the library must be kept good.
④ guarantee the supply electrode unit using at least six months after the use, storage of the electrodes should be done before the first use of storage.
⑤ storage and safekeeping of special welding electrodes should be higher than the general, should be stacked in the warehouse or designated special areas, wet or damaged packaging allowed storage of untreated electrode.
⑥ electrode storage database should be set thermometer and hygrometer. The indoor temperature low hydrogen type electrode of not less than 50C, relative air humidity of 60%.
⑦ for damp, drug skin discoloration, rust welding electrode core has, subject to quality assessment after drying, if the performance indicators to meet the requirements before storage, otherwise it can not storage.