R407焊条焊接P91与P22异种钢接头焊接性分析
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摘要
通过斜Y型坡口裂纹试验、插销试验测试了采用R407焊条焊接P91与P22异种钢接头的冷裂纹倾向,并对不同预热温度下焊态接头组织和硬度进行了分析。结果表明:预热温度提高之后,插销试验的临界断裂应力不断增大,冷裂纹倾向降低;预热温度150℃时,临界断裂应力相当于R407熔敷金属的抗拉强度,接头裂纹率为零。室温下,P91侧热影响区和焊缝组织均为马氏体,P22侧热影响区组织为马氏体、铁素体和珠光体;预热温度150℃时,P91侧热影响区组织为细小马氏体和贝氏体,焊缝组织为贝氏体,P22侧热影响区组织为贝氏体和铁素体。随着预热温度升高,焊缝和热影响区硬度降低;预热温度150℃时,接头最高硬度低于350HV。研究成果可为现场异种钢焊接提供技术参考。
The cold cracking susceptibility of dissimilar P91-P22 joint welded with R407 electrode was checked out using Y-slit type test and implant test,and the microstructure and hardness of welded joint under different preheat temperature were analyzed.The results were shown as follows:with the increase of preheat temperature,the critical fracture stress of the implant test increased,and the cold cracking susceptibility decreased;at the preheat temperature of 150℃,the critical fracture stress approximately equaled to the tensile strength of the deposited metal of R407 electrode,and the cracking rate of joint was zero.At room temperature,there was martensite in welding line and heat affected zone(HAZ)on P91 side,and martensite,ferrite and pearlite in HAZ on P22 side.When the preheat temperature reached 150 ℃,there would be tiny martensite and bainite in HAZ on P91 side,bainite in welding line,and bainite and ferrite in HAZ on P22 side.The hardness of HAZ and welding line decreased with the increase of preheat temperature,and when the preheat temperature reached 150℃,the highest hardness of joint would be less than 350 HV.The research results can provide technical reference for on-site welding of dissimilar steel joint.
The cold cracking susceptibility of dissimilar P91-P22 joint welded with R407 electrode was checked out using Y-slit type test and implant test,and the microstructure and hardness of welded joint under different preheat temperature were analyzed.The results were shown as follows:with the increase of preheat temperature,the critical fracture stress of the implant test increased,and the cold cracking susceptibility decreased;at the preheat temperature of 150℃,the critical fracture stress approximately equaled to the tensile strength of the deposited metal of R407 electrode,and the cracking rate of joint was zero.At room temperature,there was martensite in welding line and heat affected zone(HAZ)on P91 side,and martensite,ferrite and pearlite in HAZ on P22 side.When the preheat temperature reached 150 ℃,there would be tiny martensite and bainite in HAZ on P91 side,bainite in welding line,and bainite and ferrite in HAZ on P22 side.The hardness of HAZ and welding line decreased with the increase of preheat temperature,and when the preheat temperature reached 150℃,the highest hardness of joint would be less than 350 HV.The research results can provide technical reference for on-site welding of dissimilar steel joint.
引文
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[5]周振丰.焊接冶金与金属的焊接性[M].北京:焊接工业出版社,1988.
[6]李俊林.锅炉用钢及其焊接[M].哈尔滨:黑龙江科学技术出版社,1988.
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[8]耿忠勤.P91钢与P22钢焊接及热处理工艺[J].黑龙江科技信息,2012(36):40-40.
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