2A12铝合金筋板件T型搅拌摩擦焊工艺及焊后热处理_黎俊初

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1、第19卷第2期材料科学与工艺Vol.19No.22011年4月MATERIALSSCIENCE＆TECHNOLOGYApr．，20112A12铝合金筋板件T型搅拌摩擦焊工艺及焊后热处理黎俊初，周德生，刘大海，刘鸽平(南昌航空大学航空制造工程学院，南昌330063，E-mail:03eagle@sina．com)摘要:为评价2A12铝合金筋板件搅拌摩擦焊工艺并探寻提高接头强度的途径，进行了2A12铝合金筋板件的T型搅拌摩擦焊焊接工艺试验，并对不同人工时效热处理下焊接接头的微观组织及性能进行了研究．研究表明:采用T型搅

2、拌摩擦焊即可实现2A12铝合金筋板件的成形，当搅拌头旋转速度为750r/min、焊接速度60mm/min时，接头的抗拉强度达到了315MPa，为母材强度的70.1%;断裂出现在前进侧热机影响区，硬度的最低处也在该区域，说明2A12铝合金搅拌摩擦焊接头的薄弱点在热机影响区．采用退火+固溶+分级时效热处理的方法能显著改善焊接接头的强度，接头的抗拉强度可达387MPa，为母材的86.3%;焊接接头的薄弱点仍在前进侧的热机影响区．关键词:2A12铝合金;搅拌摩擦焊;人工时效;热处理中图分类号:TG146.4文献标志码:A文

3、章编号:1005－0299(2011)02－0080－06FrictionstirweldingandsuccessiveheattreatmentofT-shapedrib-webpartsof2A12aluminimalloyLIJun-chu，ZHOUDe-sheng，LIUDa-hai，LIUGe-ping(ShoolofAeronauticalManufacturingEngineeing，NanchangHangkongUniversity，Nanchang330063，China)Abstract:T

4、oevaluatethefrictionstirwelding(FSW)techniqueofrib-webpartsandtoexplorethewaysofimprovingthejointstrength，theT-shapedFSWprocesswasconductedfortherib-webpartsof2A12aluminumalloy，andtherelativemicrostructureandmechanicalpropertyofweldedjointswereinvestigatedbefo

5、reandaf-teraseriesofaritificicalagingprocesses．ResultsshowthattheT-shapedFSWtechniquealonecanrealizetheformationof2A12aluminumalloyrib-webparts．Andwhentherotatingspeedofstirringjointis750r/minandtheweldingspeedis60mm/min，theweldedjointshaveabettertensilestreng

6、thof315MPathatis70．1%ofthatofthebasemetals，whichareregardedasanidealparametersundertheexperimentalconditions．Thefractureandthelowesthardnessappearinthesamelocationinthethermo-mechanicallyaffectedzone(TMAZ)ofadvancingsideofjoints，whichistheweakpointoffrictionst

7、irweldingjointsfor2A12aluminumalloy．Theweldedjointsafterheattreatmentshowthatasignificantimprovementupontensilestrengthcanbeobservedbyusingacombinedagingprocessofannealing，solutionandstepaging．Thetensilestrengthofjointscanreach387MPa，86．3%ofthatofthebasemetals

8、．However，theweakpointofjointsisstilllocatedinthethermo-mechanicallyaffectedzone(TMAZ)ofadvancingside．Keywords:2A12aluminumalloy;frictionstirwelding;artificialaging;heattreatment壁板类