欢迎来到天天文库
浏览记录
ID:54370105
大小:2.11 MB
页数:7页
时间:2020-04-30
《X80管线钢光纤激光-MAG复合焊接打底层组织及性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第4O卷第4期中国激光Vo1.4O。No.42013年4月CHINESEJOURNALOFLASERSApril,2013X80管线钢光纤激光.MAG复合焊接打底层组织及性能雷正龙檀财旺陈彦宾刘德健。胡席远。胡佩佩曾惠林。哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001。华中科技大学材料学院,湖北武汉430074。中国石油天然气管道科学研究院,河北廊坊065000摘要采用光纤激光一熔化极活性气体保护焊(MAG)复合焊接进行X80管线钢6mm厚根部的打底焊接,以实现单面焊双面成形。对工艺规范参数优化后的焊接接头进行宏观成形分析和显微硬度、拉伸、冲击、弯曲等力学性能
2、研究。在此基础上,重点研究了激光一MAG复合焊热循环对打底焊焊缝接头微观组织的影响。结果表明,在优化的工艺参数范围内,可获得成形良好、无缺陷的焊缝;焊缝截面呈高脚杯状,可分为电弧作用区和激光作用区;电弧作用区的硬度高于激光作用区;拉伸试样断裂于母材;电弧作用区焊缝组织主要为针状铁索体和少量的先共析铁素体,激光作用区焊缝组织主要为针状铁素体和贝氏体类型组织(上贝氏体+粒状贝氏体);激光作用区和电弧作用区的热影响区组织差异不大,但电弧作用区的过热区明显宽于激光作用区。关键词激光技术;复合焊接;微观组织;针状铁素体;X80管线钢中图分类号TG456.7文献标识码Adoi:10.3788/
3、CJL201340.0403002Iicr0structureandMechanicalPropertiesofX80PipelineSteelBackingWeldedJointbyFiberLaser-MAGHybridWeldingLeiZhenglongTanCaiwangChenYanbinLiuDejian。HuXiyuanHuPeipei。ZengHuilin。StateKeyLaboratoryofAdvancedWeldingandjoining,HarbinInstituteofTechnology,Harbin,Heilo~,lgjiang150001,Chi
4、naSchoolofMaterialsScienceandEngineering,HuazhongUniversityofScienceandTechnology,Wuhan,Hubei430074,China。PipelineResearchInstituteofCNPC,Langfang,Hebei065000,ChinaAbstractFiberlaser-metalactive—gaswelding(MAG)hybridweldingon6-mm—thickrootofX80pipelinesteeliscarriedouttoattainonesideweldingbot
5、hsidesformation.Mechanicalpropertiesofweldedjointinoptimalparameterssuchasmicrohardness,tensilestrength,impacttoughness,andbendingstrengtharestudied.Basedonthis,theeffectofthermalcyclecausedbyhybridweldingonweldedjointisinvestigated.Theresultsindicatethatgoodappearance,defectfreejointcanbeachi
6、evedintheoptimizedparameters,andthecross.sectionofweldedjointexhibitsfeatureof“goblet”,whichcanbedividedintotwoparts:arczoneand1aserzone.ThemicrohardnessinarczoneiShigherthanthatin1aserzone.Fractureoftensiletestoccursinthebasemeta1.Themicrostructuresofweldinarczonemainlyconsistofacicularferrit
7、eandasmal1amountofproeutectoidferrite.Whereas,Themicr0structuresofweldinlaserzonemainlycomposeofacicularferriteandbainite-like(upperbainiteandgranularbainite).Thedifferenceinmicrostructureofheataffectedzone(HAZ)betweenarczoneandlaserzon
此文档下载收益归作者所有