试件形状对铝合金摩擦叠焊成形的影响

Effects of Specimen Shapes on the Friction Hydro-Pillar Processing Forming of Aluminum Alloys

为了研究不同试件形状对铝合金摩擦叠焊单元成形的影响,选取7075铝合金为试验对象,使用ABAQUS有限元软件,对摩擦叠焊单元成形这一复杂的热力耦合过程进行数值模拟,在将其简化为二维轴对称模型的基础上,采用FRIC子程序和网格重划分技术进行分析.对比温度云图、变形情况以及应力分布,结果表明:试件形状能够影响焊接缺陷产生的以及缺陷的尺寸;相对于焊棒形状,焊孔形状对焊接缺陷产生的影响更大,直角焊孔对塑性金属的流动阻碍作用最大,倒角焊孔次之.圆角焊孔阻碍作用最小,更容易得到较好的焊接质量.

In order to study the effects of different specimen shapes on the friction hydro-pillar processing（ FHPP） forming of aluminum alloys,7075 aluminum alloy was selected as the experimental object, and the ABAQUS finite element software was used. The numerical simulation of the complex thermo-mechanical coupling process of FHPP was simplified to a twodimensional axisymmetric model and analyzed with FRIC subroutine and grid remeshing technique. By comparing the temperature cloud,deformation and stress distribution,the results showed that the shape of the specimen can affect the forming of welding defects and the defect size,the shape of the welding hole has a greater impact on the welding defect than the shape of welding rod and the fillet can be very good to prevent the forming of welding defects,the rectangular weld hole has the largest effect on hindering the fluidity for plastic metals,the chamfer weld hole has a second influence,and the fillet weld hole has the least influence which leads to better welding quality.