28CrMoNiV与25Cr2Ni4MoV异种转子钢焊接接头性能研究

蔡雄军; 冷进明; 熊建坤

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28CrMoNiV与25Cr2Ni4MoV异种转子钢焊接接头性能研究
Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel
2018年48卷第8期页码：114-120
DOI：

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蔡雄军, 冷进明, 熊建坤. 28CrMoNiV与25Cr2Ni4MoV异种转子钢焊接接头性能研究[J]. 电焊机, 2018,48(8):114-120.

CAI Xiongjun, LENG Jingming, XIONG Jiankun. Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel[J]. 2018,48(8):114-120.
蔡雄军, 冷进明, 熊建坤. 28CrMoNiV与25Cr2Ni4MoV异种转子钢焊接接头性能研究[J]. 电焊机, 2018,48(8):114-120. DOI：

CAI Xiongjun, LENG Jingming, XIONG Jiankun. Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel[J]. 2018,48(8):114-120. DOI：

摘要

为充分发挥不同材料在不同运行条件下的优势,采用埋弧焊（SAW）堆焊过渡层,采用窄间隙钨极氩弧焊（NG-TIG）和窄间隙埋弧焊（NG-SAW）组合焊接方法将28Cr Mo Ni V和25Cr2Ni4Mo V进行连接以满足汽轮机转子工况的需求,对异种钢焊接接头进行了拉伸、弯曲、硬度、冲击试验。结果表明:焊接接头的抗拉强度低于两种母材,断裂位置位于过渡层,焊接接头硬度236,3,75 HV,在-40℃、0℃和40℃温度条件下,焊接接头的韧性依次为BM2、HAZ-1、HAZ-2、SAW焊缝、BM-1。

Abstract

In order to give full play to the advantages of different materials under different operating conditions,transition layers were deposited by submerged-arc welding（SAW）,and butt joining between 28 Cr Mo Ni V and 25Cr2Ni4MoV were performed using narrow gap tungsten-arc welding（NG-TIG）combined with narrow-gap submerged-arc welding（NG-SAW）,thereby meeting the requirements of working condition of the steam turbine rotor. Tensile,bending,hardness and impact tests of dissimilar steel welded joints were carried out. The results indicated that the tensile strength of the welded joints is lower than that of the two kinds of parent materials,and the fracture locations are at the transition layers. And the hardness value of the welded joints is between 236 ,3,75 HV. Under the temperature conditions of-40 ℃,0 ℃ and 40 ℃,the toughness of BM2,HAZ-1,HAZ-2,SAW weld,BM-1 of welded joints increased in turn.