研究焊接速度和旋转速度对装甲级铝合金搅拌摩擦焊接接头的形成和力学性能的影响.采用弯曲试验、显微硬度测试、力学性能测试、光学显微镜和扫描电子显微镜对焊接接头进行表征.焊接接头的力学性能(包括显微硬度、抗拉强度和伸长率)随旋转速度增加而增加,随焊接速度减小而增加.焊接速度对热影响区显微硬度的影响比旋转速度更强.焊接速度和旋转速度对搅拌摩擦焊接接头的力学性能有重要影响,且其影响可用回归模型进行预测.
The influence of different welding speeds and rotary speeds on the formation and mechanical properties of friction stir weld joints of armor grade aluminum alloy was presented. The developed weld joints were characterized by bend tests, micro-hardness tests, tensile tests, optical and scanning electron microscopies. Mechanical properties (i.e., micro-hardness, ultimate tensile strength and elongation to fracture) increased with the increase in rotary speed or decrease in welding speed. The effect of welding speed on micro-hardness of heat affected zones was more profound than the rotary speeds. The welding speeds and rotary speeds influenced the mechanical properties and their effects on various mechanical properties of the friction stir welded joints can be predicted with the help of regression models.
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