NiAl粉末直流TIG电弧堆焊层的稀释率及其控制.pdfVIP

j表面改性技术l Ni-Al粉末直流TIG电弧堆焊层的稀释率及其控制 鼻竹竹竹竹竹竹毒 董巍1，单际国1’2，谭稳达1，张迪1，任家烈1 (1．清华大学机械工程系，北京100084；2．清华大学先进成形制造教育部重点实验室，北京100084) 的形状、稀释率和化学成分的影响规律，并从降低母材温度的角度出发，考察了辅助冷源对堆焊层稀释率的影响。 结果表明，随着堆焊规范的减弱，堆焊层的熔宽和熔深减小、堆高增加，堆焊层的稀释率由70％降低到32％，有利 于获得低稀释率的堆焊层。在本文试验条件下采用辅助冷源对母材进行冷却，使堆焊层的堆高增大、熔深减小、 稀释率降低到2l％。 关键词：稀释率；Ni．A1粉末堆焊；直流TIG电弧；辅助冷源 文献标识码：A 中图分类号：TGl56．99 文章编号：0254-6051(2007)07m041m3 DilutionRateandItsControlinDCTIGArcNi．AlPowder Surfacing DONG Jia—lie! Weil，SHANJi．gu01”，TANWen．dal，ZHANGDil，REN ofMechanical (1．Department Engineering，TsinghHaUniversity，Beijing100084，China；2．KeyLaboratory ofAdvancedMaterials of 100084，China) ProcessingTechnology，MinistryEducation，Beijing thedilution beadrichinNiand effectsofthesurfa- aimat rateand Abstract：To A1，the controlling obtainingsurfacing onthe rate ofbeadwere viewofdecrea· and parameters，dilutioncomposition investigated．In cingparametersgeometric the ofthebase effectsoftheassistantcooleronthedilutionratewerestudied．Theresults sing temperature metal，the showthatwith the widthand ofbead reinforcementincrea— loweringsurfacingparameters，thepenetrationdecrease，the thedilutionrate from70％to isinfavorof lowdilutionrate ses，and drops 32％，which obtaining surfacing assistantcoolerusedinthe onselected reinforcementofbead condition，the surfacingprocess operation decrea