铝合金厚板FSW焊缝成形及金属流动行为分析
收稿日期: 2016-01-11
修回日期: 2016-03-02
网络出版日期: 2016-03-11
基金资助
国家自然科学基金（51265043，51265042）；江西省高等学校科技落地计划（KJLD13055，KJLD12074）
Weld formation and material flow behavior in FSW thick aluminum alloy plates
Received date: 2016-01-11
Revised date: 2016-03-02
Online published: 2016-03-11
Supported by
National Natural Science Foundation of China (51265043, 51265042); Landed Plan of Science and Technology in Colleges and Universities of Jiangxi Province (KGLD13055, KJLD12074)
毛育青 , 柯黎明 , 刘奋成 , 陈玉华 . 铝合金厚板FSW焊缝成形及金属流动行为分析[J]. 航空学报, 2016 , 37(11) : 3546 -3553 . DOI: 10.7527/S1000-6893.2016.0061
7075-T6 aluminum alloys of a thickness of 20 mm are friction stir welded using a tapered pin with three flats, and the effect of process parameters on weld formation and local flow characteristic are investigated. With the increase of the rotation speed, the area of nugget increases due to the increase of the amount of plastic metal migration in unit time, and the area of loose zone decreases and even disappears. When the rotation speed is too high, the loose defect emerges again. Decreasing the welding speed appropriately can improve the weld quality by increasing the heat input in unit length, and the defect is gone. A lower welding speed causes a bigger loose zone and many internal voids because of more heat input. In the welding under appropriate parameters, more plastic materials horizontally migrate around the rotary pin with the appearance of the temporary cavity, and the "sucking-extruding" effect along the horizontal direction can thus be enhanced, improving the flowability and eliminating the internal defects.
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