Volume 20, Issue 8 (August 2020)                   Modares Mechanical Engineering 2020, 20(8): 1979-1989 | Back to browse issues page

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1- Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran , mamourian@um.ac.ir
2- Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran
3- Aerospace Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran
Abstract:   (2067 Views)
Residual stress is one of the most substantial defects of welded parts caused by intensive thermal gradient. In this study, different mechanical and thermal techniques for reducing residual stresses have been investigated and the effectiveness of contributing parameters has been discussed afterwards. Subsequently, some equations have been proposed for welding energy and exergy efficiency and the effects of parallel flame heating, vibration method, and hammer working method on reducing welding residual stresses are expressed. The results show that by using parallel heating technique, the enhancement of flame power would result in reducing both energy and exergy efficiencies. However, the decremental rate of the two efficiencies would slow down and they approach to an asymptotic value. Increasing the speed of welding improves two efficiencies more than 2 times. On the other hand, the normalized entropy is reduced by increasing the heat input of the flames. This fact is an indicator of a reduction in welding residual stress. This reduction is more at high speeds. Eventually, the ratio of the two efficiencies shows that in this study, economical power was about 1800j/s. The reduction of normalized entropy for the vibration, hammering, and parallel flame methods are 0.001, 0.1, and 10, respectively. Overall, it is expected that thermal methods are more efficient than mechanical methods in reducing residual stresses.
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Article Type: Original Research | Subject: Welding
Received: 2018/10/15 | Accepted: 2020/05/4 | Published: 2020/08/15

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