印度西孟加拉邦加尔各答Sagardighi电厂和Durgapur电厂建设工程3×300 MW机组锅炉高温过热器出口集箱,规格φ609.6 mm×110 mm,采用国产钢材12Cr1MoVG钢,现场安装焊接采用印度焊接材料.结合该集箱厚壁、大直径管焊接的工艺特点,强调了12Cr1MoVG钢采用印度焊接材料焊接时,应注意充氩气保护、预热、层间温度及焊接线能量的控制,并采用多层多道焊和焊后热处理.实践证明,根据此焊接工艺能获得良好的焊接接头.%The Φ 609.6 mmxllO mm pipe is welded by adopting China domestic 12CrlMoVG steel and India welding materials at site construction, which is used in 3 x300 MW boiler high temperature super-heater outlet header of Sagardighi and Durgapur Thermal Power Plants, Kolkata, India.In combining with the process characteristics for large diameter and heavy thickness header,it stresses some precautions,such as filling argon protection,preheating, controlling interpass temperature, while using India welding material. It also uses multi-layer and multi-pass welding.The practice proves that using this kind of welding procedure can obtain ideal welded joints.
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