摘要
为了扩大搅拌摩擦搭接焊在镁合金异种材料的市场应用范围,采用搅拌摩擦搭接焊工艺对AZ31镁合金和LA141镁锂合金进行焊接。借助光学显微镜、维氏硬度计和万能试验机等仪器设备研究了搅拌摩擦搭接焊接头的显微组织,测试了接头的显微硬度和剪切拉伸。结果表明,当旋转速度为1800 r/min,焊接速度在80~120 mm/min之间时,AZ31/LA141搅拌摩擦搭接焊成形良好,无明显缺陷。在相同的焊接工艺参数条件下,上层AZ31和下层LA141前进侧热机影响区的晶粒尺寸均小于后退侧热机影响区的晶粒尺寸,而前进侧热影响区却与之相反,其晶粒尺寸均大于后退侧热影响区的晶粒尺寸。当焊接速度变大时,上层AZ31和下层LA141前进侧热机影响区的晶粒尺寸均随之变小。上层AZ31和下层LA141焊核区的显微硬度值变化趋势不同,前者先变大后变小,而后者却呈现变大的趋势。AZ31/LA141搭接接头拉剪力随着焊接速度的增加呈现先增加后减小的趋势。
In order to expand the market application range of friction stir lap welding in magnesium alloy dissimilar materials,AZ31 magnesium alloy and LA141 magnesium lithium alloy were welded by friction stir lap welding.The microstructure,microhardness and shear tensile of friction stir lap welded joints were analyzed and tested by means of optical microscope,Vickers hardness tester and universal testing machine.The results show that when the rotation speed is 1800 r/min and the welding speed is between 80 mm/min and 120 mm/min,the friction stir lap welding of AZ31/LA141 had sound joints without obvious defects.Under the same welding process parameters,the grain size of the upper layer AZ31 and the lower layer LA141 in the thermo-mechanically affected zone on the advancing side are both smaller than those of the thermo-mechanically affected zone on the retreating side,while the grain size of the heat affected zone on the advancing side are larger than the grain size of the heat affected zone on the retreating side.When the welding speed increases,the grain size of the thermo-mechanically affected zone on the advancing side of the upper layer AZ31 and the lower layer LA141 decreases accordingly.The microhardness values of the upper AZ31 and lower LA141 weld nuggets have different trends.The former increases first and then decreases,while the latter tends to increase.With the increase of welding speed,the tensile shear force of AZ31/LA141 lap joint increases first and then decreases.
作者
雷朱坦
武冰冰
王津
耿家源
刘刚
LEI Zhutan;WU Bingbing;WANG Jin;GENG Jiayuan;LIU Gang(Jingzhou University,Jingzhou 434000,China;Nanyang Institute of Technology,Nanyang 473004,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第8期117-123,共7页
Aeronautical Manufacturing Technology
基金
湖北省自然科学基金(2019CFC909)
湖北省教育厅科学技术研究计划指导性项目(B2021429)
荆州学院科学研究基金(2021KY05)
南阳理工学院交叉科学研究项目(520067)
南阳理工学院博士科研启动项目(510109)
河南省科技攻关项目(232102230049)。
