Characterizations of weld defects, intermetallic compounds and mechanical properties of friction stir lap welded dissimilar alloys
Characterizations of weld defects, intermetallic compounds and mechanical properties of friction stir lap welded dissimilar alloys
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DOI：
10.1016/j.matchar.2019.110115
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发表时间：
2020-02-01
影响因子：
4.7
通讯作者：
Pal, Surjya Kanta
中科院分区：
文献类型：
--
作者：
Mahto, Raju Prasad;Kumar, Ravi;Pal, Surjya Kanta
本文研究了搅拌摩擦焊倾斜角和转速对AA 6061-T6和AISI 304薄板的焊接缺陷、金属间化合物、焊缝强度和显微硬度的影响。采用X射线显微计算机断层扫描和金相研究对焊接缺陷进行了定性和定量评价。通过将其与不同的工具旋转速度和倾斜角度值相关联，讨论了三维层析成像和内部空隙（孔隙）的特殊分布。内部缺陷位于搅拌区。以1度的倾斜角焊接减少了表面和内部缺陷。在焊缝区发现了厚度不均匀的金属间化合物（FexAly）层，其厚度随工艺参数的值而变化。较高的焊缝气孔率、较大的钢钩缺陷和金属间化合物层厚度的增加导致接头强度和伸长率显著降低。
This experimental investigation describes the effect of tilt angle and rotational speed on the characteristics of welding defects, intermetallic compounds, weld strength and micro-hardness in friction stir welding of thin sheets of AA6061-T6 and AISI304. Qualitative and quantitative assessments of the welding defects have been made by using X-ray micro computed tomography and metallographic study. Three-dimensional tomography and special distribution of internal voids (pores) have been discussed by correlating it to different values of tool rotational speed and tilt angle. Internal defects were localized in the stir zone. Welding at a tilt angle of 1 degrees reduced both surface and internal defects. Non-uniform thickness of intermetallic compound (FexAly) layer has been found in the weld zone whose thickness varied with the values of process parameters. Higher weld porosity, bigger steel hook defect and increased layer thickness of intermetallic compound caused a significant reduction in the joint strength and elongation.