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Effect of process parameters on microstructure and mechanical behaviors of friction stir linear welded aluminum to magnesium

机译：工艺参数对搅拌摩擦线性焊接铝镁合金组织和力学性能的影响

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摘要

The microstructure and lap-shear behaviors of friction stir linear welded wrought Al alloy AA6022-T4 to cast Mg alloy AM60B joints were examined. A process window was developed to initially identify the potential process conditions. Multitudes of welds were produced by varying the tool rotation rate and tool traverse speed. Welds produced at 1500 revolutions per minute (rpm) tool rotation rate and either 50 mm/min or 75 mm/min tool traverse speed displayed the highest quasi-static failure load of ～3.3 kN per 30 mm wide lap-shear specimens. Analysis of cross sections of untested coupons indicated that the welds made at these optimum welding parameters had negligible microvoids and displayed a favorable weld geometry for the cold lap and hook features at the faying surface, compared to welds produced using other process parameters. Cross sections of the tested coupons indicated that the dominant crack initiated on the advancing side and progressed through the weld nugget, which consists of intermetallic compounds (IMC). This study demonstrates the feasibility of welding wrought Al and cast Mg alloy via friction stir linear welding with promising lap-shear strength results.
机译：研究了搅拌摩擦线性焊接变形铝合金AA6022-T4与铸造镁合金AM60B接头的组织和搭接行为。开发了一个过程窗口以初步识别潜在的过程条件。通过改变刀具旋转速度和刀具移动速度可以产生大量焊缝。以每分钟1500转（rpm）的工具转速和50 mm / min或75 mm / min的工具移动速度产生的焊缝，每30 mm宽的搭接剪切试样显示出最高的准静态失效载荷〜3.3 kN。对未经测试的试样的横截面分析表明，与使用其他工艺参数生产的焊缝相比，在这些最佳焊接参数下进行的焊缝微孔微不足道，并且在搭接面上的冷弯和钩形特征显示出良好的焊缝几何形状。测试试样的横截面表明，显性裂纹在前进侧开始，并通过由金属间化合物（IMC）组成的焊接熔核扩展。这项研究证明了通过搅拌摩擦线性焊接来焊接变形的Al和Mg合金的可行性，并具有良好的搭接剪切强度结果。

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