Abstract
In this paper a numerical analysis of a T-joint fillet weld is performed to investigate the influences of different preheat temperatures and the interpass time on the longitudinal residual stress fields and structure deflections. In the frame of the numerical investigations, two thermo-mechanical finite element models, denoted M2 and M3, were analyzed and the results obtained were then compared with the model M1, where the preheating technique was not applied. It is concluded that by applying the preheat temperature prior to the start of welding the post-welding deformations of welded structures can be significantly reduced. The increase of the preheat temperature increased the longitudinal residual stress field at the ends of the plates. The influence of the interpass time between two weld passes on the longitudinal residual stress state and plate deflection was investigated on two preheated numerical models, M4 and M5, with an interpass time of 60 s and 120 s, respectively. The results obtained were then compared with the preheated model M3, where there was no time gap between the two weld passes. It can be concluded that with the increase of interpass time, the plate deflections significantly increase, while the influence of the interpass time on the longitudinal residual stress field can be neglected.
Highlights
The welding technique is one of the most frequently used engineering methods of joining structural components in many industrial fields
To analyze thelongitudinal influence of residual the preheat temperature and theininterpass time between twoand weld passes on the stress field plate passes on the longitudinal residual stress field and plate deflection, passes on the alongitudinal stress
This phenomenon will be far more visible in welded models with higher preheat temperatures than in the model analyzed in this study
Summary
The welding technique is one of the most frequently used engineering methods of joining structural components in many industrial fields. A study of the influence of local preheat temperature and the interpass time on the longitudinal residual stress field and deformations was carried out on a T-joint fillet welded structure, in the case where the preheat temperature was kept constant only at the beginning of the welding process. This technique is more appropriate for outdoor on-site welding of large structures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.