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. 2020 Jul 16;13(14):3169.
doi: 10.3390/ma13143169.

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

Lin Nie  1   2 , Yunxin Wu  1   2   3 , Hai Gong  1   2   3 , Dan Chen  1 , Xudong Guo  3
Affiliations
Free PMC article

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

Lin Nie et al. Materials (Basel). .
Free PMC article

Abstract

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.

Keywords: 2219 aluminum alloy; friction stir welding; residual stress; shot peening.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Diagram of friction stir welding and shot peening: (a) friction stir welding process and (b) shot peening process.
Figure 2
Figure 2
The process of measuring residual stress by XRD.
Figure 3
Figure 3
The schematic diagram of measuring residual stress by incremental center hole drilling (ICHD): (a) automatic hole drilling system and (b) measurement of residual stress.
Figure 4
Figure 4
Residual stress distribution on the surface.
Figure 5
Figure 5
Residual stress distribution along the thickness.
Figure 6
Figure 6
Effect of shot peening on the redistribution of residual stress on the surface.
Figure 7
Figure 7
The peak value of welding residual stress is before and after shot peening.
Figure 8
Figure 8
Effect of shot peening on the redistribution of internal residual stress: (a) shot peening with glass, (b) shot peening with steel, and (c) shot peening with corundum.
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