摘要
采用不同的压入量、旋转速度和焊接速度对6061-T6铝合金进行静止轴肩搅拌摩擦焊,研究了焊接工艺参数对接头组织及力学性能的影响。结果表明,所有试验参数下,焊缝表面光滑、几乎不产生飞边,焊接工艺参数能够影响材料的流动性,进而对接头成形、组织和力学性能产生影响。焊接工艺参数显著影响焊核区形态,当焊核区为球状,焊缝显微组织硬度呈W形对称分布;而当焊核区为碗状时,前进侧显微硬度略高于后退侧。在最优参数下,即压入量为0.08 mm、旋转速度为1600 r/min和焊接速度为500 mm/min,接头抗拉强度为224 MPa,达到母材的75.6%。
6061-T6 aluminum alloys were butt welded by stationary shoulder friction stir welding with different welding parameters of heel plunge depth,rotation speed and welding speed.Influence of welding parameters on microstructure and mechanical properties of joints was investigated.The results showed that the weld surface was smooth without upset metal under all parameters.Welding parameters could affect the liquidity of material,and then influenced on joint formation,microstructure and mechanical properties.Welding parameters could significantly affect the shape of nugget zone,when the shape was spherical,microhardness of the weld could be symmetrical distribution like W.However,when the shape was bowl-shape,microhardness of advancing side was slightly higher than that of retreating side.Under optimal parameters,namely,heel plunge depth of 0.08 mm,rotation speed of 1600 r/min and welding speed of 500 mm/min,maximum tensile strength of the joint was 224 MPa,reaching 75.6%of that of the base material.
作者
王瑾
李送斌
张妍
陆艺
Wang Jin;Li Songbin;Zhang Yan;Lu Yi(Shanghai Aerospace Equipments Manufacturer Co.,Ltd.,Shanghai 200245,China)
出处
《焊接》
2019年第11期33-38,I0025,共7页
Welding & Joining
基金
国防基础科研计划资助(JCKY2017203B066)
上海市青年科技启明星计划(18QB1401700)。
关键词
静止轴肩搅拌摩擦焊
焊接工艺参数
组织
力学性能
stationary shoulder friction stir welding
welding parameters
microstructure
mechanical properties
