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开封火电厂2×600MW扩建工程2#机组,壁厚δ≥70mm的P91大径管共计53道。施工中首次采取免根透、严格控制工艺过程的方法,确保P91厚壁大径管的焊口质量。本文主要从保证充氩质量、严格监控焊接工艺参数、选择适当的焊接规范等方面控制,在施工过程设专人进行旁站监督、记录。同时对工艺控制过程做了大量工作,如:精确计算焊接层数表、绘制焊缝示意图、管材性能分析、焊接、热处理工艺性分析、旁站记录表设计、增加坡口着色检验、根部双重保护、准确测温(增加远红外测温仪)、热处理温差控制、加热器,保温棉布置包扎措施。
Kaifeng Thermal Power Plant 2 × 600MW expansion project 2 # units, wall thickness δ ≥ 70mm P91 large diameter pipe a total of 53. Construction for the first time to take root-free, strict control of the process, to ensure P91 thick-walled large-diameter pipe welding quality. This article mainly from ensuring the quality of argon, strict monitoring of welding process parameters, select the appropriate welding specifications and other aspects of control, in the construction process to set up a special station to monitor and record. At the same time, a great deal of work has been done on the process control process, such as accurate calculation of welding layer table, drawing of weld schematic, pipe performance analysis, welding, heat treatment process analysis, side station recording table design, increasing bevel coloring inspection, double root protection , Accurate temperature measurement (increase far-infrared thermometer), heat treatment temperature control, heater, insulation cotton arrangement bandaging measures.