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Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

机译:2219铝合金摩擦搅拌焊接残余应力场再分配的影响

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摘要

Welding is one of the essential stages in the manufacturing process of mechanical structures. Friction stir welding structure of aluminum alloy has been used as a primary supporting member in aerospace equipment. However, friction stir welding inevitably generates residual stress that promotes the initiation and propagation of cracks, threatening the performance of the welded structure. Shot peening can effectively change the distribution of residual stress and improve the fatigue properties of materials. In this paper, friction stir welding and shot peening are performed on 2219 aluminum alloy plates. The residual stress fields induced by friction stir welding and shot peening are measured by using the X-ray diffraction method and incremental center hole drilling method, and the distribution characteristics of residual stress fields are analyzed. The effect of the pellet diameters and pellet materials used in shot peening on the redistribution of welding residual stress field are investigated. The pellet diameter used in the experiment is in the range of 0.6–1.2 mm, and the pellet material includes glass, steel, and corundum. This study provides guidance for the application of shot peening in friction stir welding structure of 2219 aluminum alloy.
机译:焊接是机械结构制造过程中的主要阶段之一。铝合金的摩擦搅拌焊接结构已被用作航空航天设备中的初级支撑构件。然而,摩擦搅拌焊接不可避免地产生残余应力,促进裂缝的起始和传播,威胁焊接结构的性能。射击喷丸可以有效地改变残余应力的分布,提高材料的疲劳性能。在本文中,在2219铝合金板上进行摩擦搅拌焊接和喷丸喷丸。通过使用X射线衍射法测量摩擦搅拌焊接和喷丸喷丸诱导的残余应力场,分析了残余应力场的分布特性。研究了在焊接残余应力场再分配的丸丸直径和颗粒材料的效果。实验中使用的颗粒直径在0.6-1.2mm的范围内,颗粒材料包括玻璃,钢和刚玉。本研究为2219铝合金摩擦搅拌焊接结构中的射击喷丸应用提供了指导。

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