X65管线钢窄坡口旋转电弧焊焊接工艺与性能罗雨，吉天亮，高萌萌，王东尧（北京石油化工学院，北京102617）摘要：针对油气管道窄坡口焊接普遍存在的侧壁未熔合问题，开展了X65管线钢窄坡口旋转电弧焊接工艺与性能的研究。搭建了X65管线钢板旋转电弧试验系统，利用高速摄像同步采集系统对旋转电弧熔滴行为进行了研究，分析了旋转电弧频率对熔滴过渡的影响。通过焊缝截面形貌的宏观金相观察，研究了窄坡口旋转电弧GMAW旋转频率对焊缝成形的影响。结果表明，高频旋转电弧加快了熔滴的过渡频率，减小了熔滴尺寸，促进了熔滴过渡过程。当旋转频率在5～30Hz范围内时，能获得良好的焊缝成形。在旋转电弧的高频搅拌作用下，所获得的焊缝表面纹路十分致密，且焊接接头具有良好的抗拉伸性能和抗弯性能。关键词：旋转电弧；熔滴过渡；焊缝成形；窄坡口中图分类号：TG444文献标识码：Adoi：10.12073/j.hj.20220921005WeldingprocessandpropertiesofX65pipelinesteelbynarrowgrooverotatingarcweldingLuoYu,JiTianliang,GaoMengmeng,WangDongyao(BeijingInstituteofPetrochemicalTechnology,Beijing102617,China)Abstract：Forthecommonproblemofside-wallincompletefusioninnarrowgrooveweldingofoilandgaspipelines,weldingprocessandpropertiesofX65pipelinesteelbynarrowgrooverotatingarcweldingwerestudied.RotatingarcexperimentalsystemofX65pipelinesteelplatewasbuilt,high-speedcamerasynchronousacquisitionsystemwasusedtostudybehaviorofrotatingarcdroplet,andinfluenceofrotatingarcfrequenciesondroplettransferwasanalyzed.Throughmacroscopicmetallographicobservationofweldsectionmorphology,influenceofrotationfrequencyofnarrowgrooverotatingarcGMAWonformationofweldwasinvestigated.Theresultsshowedthathigh-frequencyrotatingarcacceleratedtransferfrequencyofdroplet,reducedsizeofdroplet,andpromotedtransferprocessofdroplet.Whenrotationfrequencywasintherangeof5~30Hz,goodformationofweldcouldbeobtained.Undertheactionofhigh-frequencystirringofrotatingarc,surfacetextureoftheobtainedweldwasverydense,andweldedjointshadgoodtensileandbendingproperties.Keywords：rotaryarc,droplettransfer,formationofweld,narrowgroove0前言窄坡口焊接相比传统的焊接方式，有着更快的熔池冷却速度、更小的热输入，这对焊缝组织...
