X80管线钢水下湿法多道焊残余应力分析  

Residual stress analysis in multi-pass underwater wet welded X80 pipeline steel

作　　者：严春妍[1] 顾正家 聂榕圻 张可召 吴晨 王宝森[2] YAN Chunyan;GU Zhengjia;NIE Rongqi;ZHANG Kezhao;WU Chen;WANG Baosen(Hohai University,Changzhou,213022,China;Baosteel Central Research Institute,Shanghai,200431,China)

机构地区：[1]河海大学,常州213022 [2]宝钢集团中央研究院,上海200431

出　　处：《焊接学报》2024年第3期15-21,I0004,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51804097);江苏省研究生科研创新计划项目(KYCX22_0601)。

摘　　要：采用不同焊接电流对X80管线钢板进行水下湿法焊接,同时利用175 A电流下陆地焊接试验进行对比,获得了焊接电流对水下湿法焊接接头的显微组织、硬度分布、温度场和残余应力分布的影响规律.结果表明,相同的电流条件下,水下焊接接头的显微组织类型和构成与陆上焊接接头不同,焊缝的显微组织主要为先共析铁素体、粒状贝氏体、条状贝氏体和针状铁素体,粗晶热影响区的显微组织主要为条状贝氏体和少量粒状贝氏体;水下湿法焊接接头比陆地焊接接头具有更高的硬度、冷却速度和残余应力水平.水下湿法焊接接头具有较高的残余应力水平,175~205 A范围内,随着焊接电流增加,焊缝中侧板条铁素体和针状铁素体数量有所增加,焊接接头最高硬度、等效残余应力峰值和纵向残余应力峰值略有下降.Underwater wet welding of X80 pipeline steel was performed using different welding currents.Onshore dry welding with welding current of 175 A was also implemented for comparison of underwater wet welded specimens.Influence of welding current on distribution of microstructure,hardness,temperature and residual stress was obtained.The results show that microstructure in underwater welded joints is different from that in onshore welded joints with the same welding current,with weld metal exhibiting a structure of proeutectoid ferrite,granular bainite,lath bainite and acicular ferrite,and coarse grained heat affected zone exhibiting a structure of predominant lath bainite and small amount of granular bainite.Underwater wet welded joint exhibits higher hardness,cooling speed and residual stress level compared to terrestrial welded joint with the same welding current.The residual stress levels in underwater wet welded joints are high.In the current range from 175 to 205 A,the amount of ferrite side plate and acicular ferrite in weld metal increases with increasing welding current.However,the maximum hardness,peak equivalent residual stress and peak longitudinal stress decrease moderately.

关 键 词：水下湿法焊接 多道焊 温度场 应力场 

分 类 号：TG404[金属学及工艺—焊接]