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1 F/A异种钢焊接接头问题的提出电站锅炉过热器、再热器管排常用的材料有15CrMo、12Cr1MoV、钢102、T22、T91、TP304H、TP347H、TP347HFG、Super304H、HR3C等,其极限工作温度见表1。由于经济的原因,根据过热器、再热器管排工作温度的不同而常在不同的温度段上采用不同的材料,由此就带来了异种钢接头的焊接问题。DL/T939—2005《火力发电厂锅炉受热面管监督检验技术导则》6.6.6条n)款指出:对于过热器管,在运行时间大于8万h,应对与奥氏体不锈钢的异种钢接头进行外观检查,并按10%进行无损检测抽查,必要
1 F / A dissimilar steel welded joint problem proposed Power station boiler superheater, reheater tube row of commonly used materials are 15CrMo, 12Cr1MoV, steel 102, T22, T91, TP304H, TP347H, TP347HFG, Super304H, HR3C, etc., the maximum work Table 1 shows the temperature. Due to economic reasons, depending on the operating temperature of the superheater and reheater tube banks, different materials are often used in different temperature ranges, thereby resulting in the welding problem of dissimilar steel joints. DL / T939-2005 “Technical Guidelines for Supervision and Inspection of Heating Surface Heating of Boiler Heating Power Plants in Thermal Power Plants” Section 6.6.6 n) states that for superheater tubes, the operating time is more than 80,000 h and the strength of dissimilar steel with austenitic stainless steel Joints for visual inspection, and non-destructive testing by 10% random checks, necessary