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50MW boiler header welding unit

Degree solder layer d / mmI / AU / Vvl (a ~ n.nin a 1mmJ welding layer, welding weld d / m m in diameter welding I / V voltage electric current A v / emmin ,)(·) 3 test (1) grinding: the appearance of self-weld pass, the use of grinders grinding weld reinforcement, weld and make smooth transition between the base metal, and polished on both sides of 200mm within the scope of the weld flaw appear before a metallic luster. Polished surface of the weld and testing should be flat and smooth, but there should not be too deep in the notch. (2) testing: a 4010 inspection equipment with XYD carried out on 100% weld ray detection, 7 negatives all the I-level qualified. With CTS-22 ultrasonic flaw detection equipment on 100% weld ultrasonic testing, all I-level qualified. 4 weld heat treatment on the elimination of welding residual stress annealing, its technical parameters and curves shown in Figure 2. 5 tensile test mechanical properties of the method by GB/T228--2002 two tensile specimen, the average tensile strength of 485MPa. Impact test method according to GB/T229--1994, three weld specimens, the average impact of the impact absorbed energy is 109J, three heat-affected zone impact specimens, the average shock absorber 53 2007 10 gifts cold furnace installed furnace Time t / h heat treatment process in Figure 2 curves 6 Conclusion In the arduous tasks, the case of a short time, 1 month ahead of schedule to complete the above header girth welding, weld inspection once the eligibility rate of 98%, fully validated Welding Technology program is correct. The use of submerged arc welding, welding improves productivity and improved working conditions for the future production of 50MW and above the thick-walled collection tank crew took a welcome step. Power is 76J. Bending test method according to GB/T229--1994 four Author: Wang Zhonghuan, born in 1966,[link widoczny dla zalogowanych], Bachelor of Engineering, Senior Engineer, International a bend specimen scoliosis 9o. (D = 3a), no cracks. Test Results welding engineer in the boiler, pressure vessel welding technology and quality department found Volume management, and welder training and examinations. Daqing oil field welding of zirconium pipes Construction Group (163712) LIU Qingzhong Jiang Jingwei Ni Xing Daqing oilfield downhole operation to branch (163 112) Zhao Chuanbo Abstract Zirconium is a rare precious metal, has good corrosion resistance, chemical project in the foreground. In this paper, mainly from the characteristics of zirconium materials, processing, cleaning,[link widoczny dla zalogowanych], welding wire used to protect gas purity, groove angle, protective measures, analysis of its exposition through a lot of welding test, developed a set can be used for welding of zirconium pipes technological measures and protection devices. The results showed that the zirconium oxide at high temperatures that easily, nitrogen non-ferrous metals, protective measures must be taken strictly,[link widoczny dla zalogowanych], high quality cleaning and a smaller amount of heat input. Arc welding with particular attention to both sides of the heated area is not oxidized. Successful welding of zirconium pipes, welding and technical training for the future, provide technical support pipeline construction. Keywords: Zirconium Tungsten Arc Welding CLC: TG457.190 words and deeds of a technical research before, and achieved good results. Zirconium in recent years the emergence of a new corrosion-resistant metal materials, with good acid and alkali corrosion, and thus more widely used in chemical engineering in harsh environments, stainless steel and titanium alloy can not be applied situations. Corrosion resistance of zirconium oxide film depends on the integrity and firmness. In the case of high-temperature protection is not good, zirconium easily with oxygen, nitrogen, hydrogen reaction, and the higher the temperature, the more severe reaction to promote the weld brittle and prone to intergranular corrosion. Acetic acid project in Daqing Oil Field using Zr702 zirconium, the first encountered this material, then do not have the capacity of its welding construction. To master the zirconium welding technology, access the relevant information l], into the Received Date :2007 -04-27542007 on 10 1 zirconium zirconium welding is a silver-white metal, its physical properties in Table 1. As can be seen from Table 1, high melting point of zirconium, poor thermal conductivity, and thermal expansion coefficient is small. High melting point, poor thermal conductivity, indicating that zirconium welding welding current must be sufficient, and faster cooling; thermal expansion coefficient is small, indicating that welding deformation of zirconium less favorable backing weld. From the experimental results, in general the weldability of zirconium is still good, crack is less sensitive. Zirconium welding, should be a larger current (compared to stainless steel),[link widoczny dla zalogowanych], welding and cooling faster speed (if necessary, can be water-cooled) and at temperatures higher than 200 ℃ the site, through the use of the nozzle, cover and back care Triple protection to the ultimate guarantee of the performance of welded joints.

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