摘要
采用搅拌摩擦焊对1.5mm和2mm不同厚度5082铝合金板进行搭接焊,通过拉剪实验对焊接接头进行室温拉剪性能检测,用光学显微镜对接头横截面进行微观组织观察,用扫描电镜(SEM)对拉剪断口形貌进行分析。结果表明:在下压量为2.485mm、主轴的倾斜角度为3°、焊接速度为60mm/min、搅拌头转速为800r/min的工艺参数下,接头的拉剪强度可达228N/mm^2,拉剪断裂发生在薄板的前进侧热机影响区,断裂方式为韧-脆混合断裂;焊核区发生动态再结晶生成了细小的等轴晶,热机影响区组织发生塑性变形,热影响区组织与母材的相当。
Friction stir welding (FSW) was used to lap weld 1.5mm and 2mm thick 5082 aluminum alloy sheets. Tensile shear properties of the welded joint at room temperature were measured through tensile shear experiments,microstructure of the cross section of the joint was observed by optical microscope,and fracture morphology of tensile shear was analyzed by scanning electron microscope (SEM). The results show that tensile shear strength can reach 228 N/mm^2 when reduction,inclination angle of the main shaft,welding speed and rotating speed of FSW tool are 2.485 mm,3°,60 mm/min,and 800 r/min,respectively. Tensile shear fracture occurs in the thermo-mechanical affected zone (TMAZ) on the advancing side of the thin plate,which is ductile-brittle mixed fracture.Dynamic recrystallization occurs in the weld nugget region,forming fine equiaxed crystals.Microstructure of the heat affected zone (HAZ) is plastically deformed,and HAZ microstructure is equivalent to that of the base metal.
作者
柳先
罗成
王金凤
LIU Xian;LUO Cheng;WANG Jin-feng(College of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China)
出处
《轻合金加工技术》
CAS
北大核心
2019年第7期54-60,共7页
Light Alloy Fabrication Technology
基金
湖北省教育厅科学技术研究项目(D20181801)
光电子技术湖北省协同创新中心专项经费资助
关键词
搅拌摩擦焊
5082
铝合金
拉剪性能
微观组织
断口形貌
friction stir welding
5082 aluminum alloy
tensile shear properties
microstructure
fracture morphology
