Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel

CAI Xiongjun; LENG Jingming; XIONG Jiankun

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Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel
Vol. 48, Issue 8, Pages: 114-120(2018)
Published：2018
DOI：
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DOI：

CAI Xiongjun, LENG Jingming, XIONG Jiankun. Research on properties of welded joints of 28CrMoNiV and 25Cr2Ni4MoV dissimilar rotor steel[J]. Eletric Welding Machine2018, 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

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

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.