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搅拌摩擦焊(FSW)技术已成功地应用于铝合金的薄板及中等厚度板的焊接,但是在焊接铝合金厚板时,被焊件焊缝深层容易出现组织疏松甚至空洞现象。为解决厚板焊接问题,扩大FSW的应用范围,提出导入超声振动能量到FSW的焊缝区。通过对2519铝合金进行对比焊接实验,并对焊缝的微观组织和力学性能进行分析比较。试验结果表明,超声振动能有效地促进焊缝底部金属材料的流动,减小流动阻力,提高焊缝力学性能,细化金相组织。
Friction stir welding (FSW) technology has been successfully applied to aluminum alloy sheet and medium thickness plate welding, but when welding aluminum alloy thick plate, weldment deep seam prone to loose or even loose tissue phenomenon. In order to solve the problem of thick plate welding and expand the application scope of FSW, a weld zone introducing ultrasonic vibration energy to FSW is proposed. Through comparative welding experiment on 2519 aluminum alloy, the microstructure and mechanical properties of the weld are analyzed and compared. The experimental results show that the ultrasonic vibration can effectively promote the flow of the metal material at the bottom of the weld, reduce the flow resistance, improve the mechanical properties of the weld and refine the microstructure.