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大尺寸6056铝合金薄板经过搅拌摩擦焊接实验后出现了严重的面外变形,虽然变形程度小于熔化焊结果,但已经影响到被焊薄板的装配和使用.为详细研究和预测铝合金薄板在搅拌摩擦焊后的残余变形,以焊接实验条件为基础,建立了搅拌摩擦焊接三维有限元热力耦合分析模型.模型中涉及了利用搅拌头工作转矩计算热输入量、工件和卡具之间的接触热传导、随温度变化的材料模型,以及综合考虑搅拌头机械作用等工作.利用该模型可以得到不对称的纵向残余应力结果,残余变形的趋势在整块板上都与实验结果相同,而且变形量和实验测量值之间的误差在20%以内.
Large-scale 6056 aluminum alloy sheet has experienced severe out-of-plane deformation after friction stir welding experiment, although the deformation degree is less than the result of fusion welding, but has already affected the assembly and use of the welded sheet.In order to study and predict the aluminum alloy sheet in detail, Based on the experimental conditions of welding, a three-dimensional finite element thermodynamic coupling analysis model of friction stir welding is established in the model, which involves calculating the heat input using the working torque of the stirring head, the contact between the workpiece and the chuck Heat conduction, material model with temperature change, as well as considering the mechanical action of mixing head, etc. Asymmetric longitudinal residual stress results can be obtained by this model. The trend of residual deformation is the same with the experimental results on the whole plate, and the deformation And the error between the experimental measurements within 20%.