The reactor is greater than 12% chromium steel. Reactor has been made since the 1912 invention of the rapid development of the world still has a rate of 3-5% per year. The world's total consumption of the reactor reached 35 million. China is in the reactor production and consumer applications, high-speed growth period, has been widely used in petroleum, chemical industry, light industry, food, wine, pharmaceutical, household appliances, utilities, machinery, construction, municipal and civil equipment in all. 1990 China's consumption of the reactor is 26 million tons in 1999 to 153 tons in 2000 to 1.73 million tons in 2001 to 2.25 million tons in 2004, consumption of the reactor reached 4.47 million tons, ranking first in the world position, the reactor is expected in 2006 consumption will reach 600 million tons, of which chromium nickel austenitic reactor reactor consumer's total consumption accounted for 75% -80%.
China started to develop from the fifties and production reactor electrode, in 1997 China's total output electrode reactor to 7000 tons. In recent years, China's consumption of reactor rapid growth in 2004, reactor rod has been made more than 35,000 tons, made in 2006 is expected to reach 50,000 tons reactor rod around.
Since the 1950s started to develop the reactor electrode, mainly followed the former Soviet Union titania slag and raw materials system, it has a low cost, easy to press coated, anti-porosity, mechanical properties and good, but similar reactions with the European brand name Welding Electrodes compared to red kettle serious, big splash, slag removal and forming poor welding low efficiency, wastage, so since the mid-seventies to early eighties, imports for the domestic companies in Sweden AVESTA Green P5 electrode some domestic research institutions together with the electrode manufacturer, welding on the reactor off drugs cause skin redness and solution have been studied, such as Ha and welding the welding electrode factory in Tianjin, Gansu, great work and welding under blue Chau Chang, Taiyuan University of Technology and Shanxi Machine Tool Plant, etc.
1980s, several papers have published the above, people on the one hand it makes sense that their research work, get a lot of progress; the other hand, developed by several electrodes in this practical test, but also with foreign products that are still significant gaps, but since then, the domestic research in this area work on the situation in anything less from the early 1980s to the early nineties within a decade because there is no amount of research literature electrode reactor. From the early 1990s, the domestic research reactor is becoming more active electrode. King Po Taiyuan first work, Sun and others in the salt on the basis of previous work studied the reactor design of the basic principles of welding technology and ways to design the reactor electrodes made an important breakthrough in theory, and therefore won the 2000 national science and technology two prize; after the Ministry of Metallurgical Research Institute Tangbo steel construction in the mid-absorbing foreign advanced technology, new reactor successful domestic series of electrodes to improve improve and successfully set up Beijing Jinwei Welding Material Co., Ltd., so that the perfect combination of theory and practice, since the beginning of 1994, production date, production has reached its reactor electrode annual output of 3,000 tons.
In the late nineties to the beginning of this century, the domestic reactor electrodes carried out the research mushroomed, although its level did not exceed their current level of these two, but for active academic atmosphere, strengthen exchanges and still benefit.
Foreign industrial production reactor began in the early twenties, followed by the corresponding electrode reactor, the reactor electrode mature product appeared in around 1965, representatives of European countries, especially Western Europe, Sweden, a population of only about 8 million and a concentration of ESAB, AVESTA and SANDVIK other world-class reactor welding business, which the Bison AVESTA reactor rod electrode is a model of the world's reactors. Japan, Taiwan and South Asian countries have the technology base electrode reactor in Europe.
Mainly according to the Welding Electrodes slag basicity, ie acidic and alkaline oxide slag in the ratio of oxide to divide. (1) acidic electrode Skin contains large amounts of drugs TiO2, SiO2 and other acidic slag material and a certain amount of carbonate, a strong oxidizing slag, slag basicity coefficient is less than 1. Acid electrode welding, good arc stability, and can be AC â€‹â€‹and DC, little spatter, slag and liquid slag off good, mostly glassy slag, loose, good performance off the slag, weld surface appearance. Electrode in acidic drug skin contains more silica, iron oxide and titanium dioxide, strong, weld metal oxygen content is high, burning more alloying elements, alloy transition coefficient is small, deposition higher hydrogen content in metals, which weld metal ductility and toughness lower. (2) basic (low hydrogen) electrodes Skin contains large amounts of drugs alkaline slag material (marble, fluorite, etc.), and contains a certain amount of deoxidizing agent and alloying agent penetration. Electrode depends mainly on the alkaline carbonate (such as CaCO3, etc.) for the decomposition of CO2 shielding gas, arc atmosphere of hydrogen partial pressure low, and calcium fluoride in fluorite at high temperature and hydrogen combine to form hydrogen fluoride (HF), reduce the amount of hydrogen in the weld, it is also known as basic low-hydrogen Copper Electrode. Determination of glycerol, each 100g of deposited metal diffusible hydrogen content of basic welding rod is 1 ~ 8mL, acidic electrode is 17 ~ 50mL. Basic quantity of CaO slag, slag desulfurization capacity, deposited metal thermal cracking ability. Moreover, basic welding because the weld metal oxygen and hydrogen content is low, less non-metallic inclusions with high plasticity and toughness. As the drug electrode in alkaline skin contains more fluorite, arc stability is poor, generally use DC reverse only when the drug skin contains higher amounts of steady arc agents, can pay, and DC. Basic electrode for welding is generally used for more important structures, such as dynamic load or rigid to withstand the larger structure.