Effect of Segmented Skip Welding on Deformation and Residual Stress of Engine Support

doi:10.3901/JME.2025.18.138

Abstract

Abstract: Engine bracket is an important part of helicopter used to bear a large number of static and dynamic loads of engine. Trajectory welding instead of manual argon arc welding can improve welding efficiency and quality. The finite element method is used to simulate three single-pass continuous welding schemes of engine bracket trajectory welding, and the residual stress and strain after welding are compared, and the best welding parameter scheme is found. The optimal parameters of single-pass continuous welding are selected to do segmented jump welding simulation test, and the effects of different welding sequences on welding deformation of engine support are compared. The results show that the heat input distribution of step jump welding is better, and the welding residual stress and deformation are smaller. Compared with single-pass continuous welding, multi-section welding will have high stress area, but the average residual stress in the first weld is lower, and the peak axial residual stress distributed on pipes and joints can be reduced by 40% and 33% at most. The axial strain at the center of the first weld is reduced by 45% compared with that of single-pass continuous welding. The welding deformation in x direction can be reduced by 63% at most. The three-stage sequence is more suitable for the welding of engine support. And found the most suitable welding sequence of three-stage welding for engine support. Segmented welding reduces the residual stress and deformation of the engine support, and combined with finite element method, it reduces the test cost and shortens the test period.

Key words: numerical simulation, welding sequence, circumferential weld welding

CLC Number:

TG404

TANG Lei, ZENG Yida, GUO Zhenghua, LI Zhiyong, WANG Guangping, WANG Yan. Effect of Segmented Skip Welding on Deformation and Residual Stress of Engine Support[J]. Journal of Mechanical Engineering, 2025, 61(18): 138-150.

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