多道焊工艺实现大厚度钢板手工自蔓延焊接的研究

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1、网络出版时间：2013-12-1913:29网络出版地址：http://www.cnki.net/kcms/detail/61.1133.TG.20131219.1329.047.htmlHotWorkingTechnology2013,Vol.42,No.23多道焊工艺实现大厚度钢板手工自蔓延焊接的研究刘宏伟袁马世宁袁朱胜袁孙晓峰(装甲兵工程学院装备维修与再制造工程系袁北京100072)摘要院针对大厚度钢板高焊接能量需求难以满足的问题袁采用野开坡口尧多道焊冶工艺方法袁实现了16mm厚45钢板的手工自

2、蔓延焊接遥研究了手工自蔓延多道焊工艺袁分析了焊接接头的组织结构袁测试了其主要力学性能遥结果表明院以焊接角度85毅尧燃弧长0~5mm尧焊接速度4mm/s进行手工自蔓延焊接袁只需焊接2层即可完全填充焊缝遥焊接接头组织由热影响区尧熔合区与焊缝合金区组成袁焊缝合金与母材经熔合区形成良好的冶金结合遥由于多道焊的影响袁焊缝附近的热影响区组织粗大曰熔合区与热影响区尧焊缝合金区均结合紧密袁Cu尧Fe尧Ni弥散分布其中袁元素Ni起到了关键的过渡连接作用曰焊缝合金区主要由含Fe的Cu基固溶体与含Cu的Fe基固溶体组成袁两

3、种形貌的组织均匀尧有序地分布遥焊接接头的拉伸强度为314MPa袁弯曲强度为367MPa袁焊缝合金的维氏硬度为168HV0.2袁力学性能达到了应急抢修的技术指标遥关键词院手工自蔓延焊接曰多道焊工艺曰组织结构曰力学性能中图分类号院TG456.9文献标识码院A文章编号院1001-3814(2013)23-0036-05StudyonSHSWeldingSteelPlateswithBigThicknessbyMulti-passWeldTechnologyLIUHongwei袁MAShining袁ZHUSh

4、eng,SUNXiaofeng(DepartmentofMaintainingandRemanufactureEngineering,AcademyofArmoredForceEngineering袁Beijing100072)Abstract院SHSmulti-passweldingwithgroovemethodwasusedtojoin45steelplateswiththicknessof16mm,whichcanresolvetheproblemofhighweldenergydemandf

5、orthethicksteelplates.Themicrostructureoftheweldjointswasanalyzed,andthemainmechanicalperformancesweretested.Theresultsshowthatattheconditionsofweldangleof85毅,arclengthof0-5mmandweldvelocityof4mm/s,only2layerswereneededtofillintheweldedjoint.Theweldedjo

6、intswerecomposedofheat-affectedzone,fusionzoneandalloyzone.Thefavorablemetallurgicalbondingwasformedbetweentheweldmentandthealloyzonebythefusionzone.Duetotheeffectofthemulti-passweld,thecrystalsintheheat-affectedzonewerebulky.Thefusionzoneandheat-affect

7、edzone,aswellasthefusionzoneandalloyzone,joinedtightly.Cu,FeandNiweredispersedlydistributedintheweldedjoints.AndNiactedastheimportanttransitionjoiningelement.ThealloyzoneismainlycomposedofCu-basedsolidsolutionwithFeandtheFe-basedsolidsolutionwithCu.Thet

8、wokindsofstructureareequablyandregularlydistributed.Thetensilestrengthoftheweldedjointsis314MPa,flexuralstrengthis367MPa,andtheVickershardnessofthealloyzoneis168HV0.2.Themechanicalperformancescanmatchwiththetechnicaldemandforthee