Analysis of Hot Crack and Welding Deformation during One-side Butt Welding Using Idealized Explicit FEM

This paper reports on the analyses by idealized explicit FEM of hot crack and welding deformation during one-side butt welding. In the hot crack analysis, the incremental value of the plastic strain generated in the brittle temperature range (BTR) and the temperature gradient vector have been evaluated as the occurrence index of hot cracks. By comparing these with the results of welding experimentation, the validity and effectiveness of the hot crack occurrence forecast by this analysis method have been examined. In the deformation analysis, the actual structure size level has been examined for one-side submerged arc welding (FCBTM method) and one-side tandem welding (HT-MAGTM method). It has been shown that the application of these analysis methods has enabled deformation forecast at high speed and with high accuracy even in large-scale analyses, which hitherto have been difficult. © 2021 Kobe Steel Ltd. All rights reserved.