Influence of welding sequence on welding deformation and residual stress of a stiffened plate structure. (15th September 2015)

• Record Type: Journal Article
• Authors: Chen, Zhen; Chen, Zhechao; Shenoi, R. Ajit
• Is Part Of: Ocean engineering. Volume 106(2015)
• Page Start: 271
• Page End: 280
• Publication Date: 2015-09-15
• Subjects: Welding induced distortion -- Residual stress -- Welding sequence -- Shell element -- Stiffened plate structure; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2015.07.013
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: An important consideration in the safe and efficient manufacture and operation of marine structures is the possible distortion, and consequential induced residual stress, owing to welding. This paper deals with welding simulation of a stiffened plate structure with longitudinal and transverse stiffeners using a thermal elasto-plastic FE method. Shell elements with section integration features are adopted to model the plate and stiffeners and solid elements to model the local detail of weld line region. Linear constraint equations are established between degrees of freedom of the shell and solid elements. Welding parameters of heat input, welding speed and welding sequence are considered in the analysis. A typical fillet-welded joint is studied and the thermal and mechanical results are compared with experimental values. Six welding sequences are simulated. The results demonstrate the specific influences of the different welding parameters on residual distortion and stress in a stiffened plate structure. Highlights: Shell element can enable three dimensional heat transfer analysis effectively. Welding sequences do influence the magnitude of panel bending distortion. Longitudinal residual stress is not evidently affected by welding sequences. The difference in transverse residual stress by welding sequences is significant. Optimizing welding sequence can improve global bending distortion of structures.