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首页> 外文期刊>Journal of Materials Engineering and Performance >Nondestructive Evaluation of Friction Stir-Welded Aluminum Alloy to Coated Steel Sheet Lap Joint
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Nondestructive Evaluation of Friction Stir-Welded Aluminum Alloy to Coated Steel Sheet Lap Joint

机译：搅拌摩擦铝合金对涂层钢板搭接接头的无损评估

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摘要

Dissimilar lap joints of aluminum sheet (AA 6061) of 2 mm thickness and zinc-coated steel sheet of 1 mm thickness were produced by friction stir welding with different combinations of rotational speed and travel speed. Ultrasonic C- and B-scanning, and radiography have been used in a complementary manner for detection of volumetric (cavity and flash) and planar (de bond) defects as the defects are in micron level. Advanced ultrasonic C- scanning did not provide any idea about the defects, whereas B-scanning cross-sectional image showed an exclusive overview of the micron-level defects. A digital x-ray radiography methodology is proposed for quality assessment of the dissimilar welds which provide three-fold increase in signal-to-noise ratio with improved defect detection sensitivity. The present study clearly shows that the weld tool rotational speed and travel speed have a decisive role on the quality of the joints obtained by the friction stir welding process. The suitability of the proposed NDE techniques to evaluate the joint integrity of dissimilar FSW joints is thus established.
机译：通过搅拌和旋转速度和行进速度的不同组合，制造了厚度为2毫米的铝板（AA 6061）和厚度为1毫米的镀锌钢板的搭接接头。超声波C扫描和B扫描以及射线照相以互补的方式用于检测体积（空腔和溢料）和平面（剥离）缺陷，因为缺陷处于微米级。先进的超声波C扫描没有提供有关缺陷的任何信息，而B扫描的横截面图像显示了微米级缺陷的独家概述。提出了一种数字X射线放射线照相方法，用于异种焊缝的质量评估，该方法可将信噪比提高三倍，并提高缺陷检测的灵敏度。本研究清楚地表明，焊接工具的旋转速度和行进速度对搅拌摩擦焊接工艺获得的接头质量具有决定性的作用。因此，确定了所提出的NDE技术用于评估不同FSW接头的接头完整性的适用性。

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