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 Wysłany: Nie 19:30, 02 Sty 2011 Temat postu: air jordans 15CrMoR heat-resistant steel pressure |
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15CrMoR heat-resistant steel pressure vessel welding repair
o. 11 published the first half of Casting ・ Forging ・ welding of metal casting and forging root out use of welding technology. Location preheating before welding, preheating groove on both sides of the range of 80mm,[link widoczny dla zalogowanych], preheating temperature 200 ℃. Removed immediately after tack welding slag. Measured temperature between layers meet temperature requirements (200 ~ 250 ℃) immediately after welding, welding parts to ensure both internal and external surfaces to reach the required preheating temperature. Welding, such as cooling too quickly, is easy to form a hardened body heat affected zone and weld metal are easily lead to cold cracking. (4) Welding process parameters and the second floor of backing weld bead using 4,[link widoczny dla zalogowanych],2. Omm, more than triple by the R307 4,2.5 n Ⅱ n low hydrogen sodium type electrode welding,[link widoczny dla zalogowanych], DCRP. To reduce the welding stress. Welding current to be small, layer of asking to be hammering. Welding process, each must be examined to avoid defects such as cracks and slag. Welding process parameters in Table 1. Table 1, weld layer welding parameters welding current / A arc voltage / V welding speed / (cm ・ min.) 1 ~ 280205 remaining 90,226 (5) tempering after welding Cr-Mo steel, cold cracking tendency of big. Crack factors lead to the production of hydrogen of the first place. Thus, after welding (or intermediate stop welding) must immediately eliminate hydrogen. In general, Cr-Mo steel container wall thickness, rigid, long manufacturing cycle, the heat treatment after welding, not quickly, and stability for the crack size weldments. Final heat treatment temperature (620 ~ 640) ± 15 ℃. Flame heating, welding covered with asbestos insulation blankets and slow cooling. After cooling to 200 ℃ to remove the asbestos in the air felt cool to room temperature. After 3 test weld and penetration by JB4730 ultrasonic flaw detection, I-level qualified. Testing mechanical properties of welded joints: welded joints in accordance with the specimen JB/T4708-2000 (steel pressure vessel welding procedure qualification \performance test tensile strength of O \Welding analysis and related technical standards, and demonstrated by experiment to develop a practical welding process. using this technique successfully repaired the 15CrMoR resistant steel pressure vessel. After nearly two years of using the operating normally, without any problems, to solve repair problems, as well as counterparts in a reference encounter the same problem. field, supercritical steam turbine nozzle chamber casting process design and production CastingProcessDesignandManufactureforNozzleChestCastingofSuper-criticalPressureTurbine Yu Yang,[link widoczny dla zalogowanych], Chun-Jie Xu, Ino (Harbin Turbine Co., Ltd. Thermal Corporation, Harbin 150046 ) Abstract: According to the turbine design and manufacture of high pressure nozzle chamber difficulties - cavity bound complex and uneven wall thickness, using the forced feeding of Refrigeration and multi-faceted and other effective measures, and in the process design and technology used during the preparation advanced casting simulation software. The practice shows that the process design to meet the production requirements. especially the multi-faceted process taken by feeding the design is reasonable, and received the expected results,[link widoczny dla zalogowanych], for the future production of steel castings of this type to explore a new ideas. Keywords: nozzle chamber; casting process; forced cooling; multi-faceted feeding CLC: TG269 Document code: B Article ID: 1001.3814 (2009) 11-0161.03 Harbin Ultra Supercritical Steam Turbine Plant mainstream Received: 2008.12.05 Author: Yu Yang (1980.), male, Jilin, Assistant Engineer, mainly engaged in casting material, casting repair welding research and technology areas: Tel :0451 -82953507; E-mail: [link widoczny dla zalogowanych] production units. 600MW steam turbine which is made in the single unit installed capacity of the largest. ultra-supercritical technology was first purchased by a company from Japan, with the national power industry. on the high-capacity increasing demand for units, unit requirements of domestic production is increasing. As a high voltage set of key pieces of domestic manufacture of the nozzle chamber has extremely important significance. \
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