2021 Fiscal Year Final Research Report

Systematization of analysis for welding hot cracking and establishment of crack prevention method using AI

Research Project

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Project/Area Number	19H02366
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 24020:Marine engineering-related
Research Institution	Osaka Prefecture University
Principal Investigator	Shibahara Masakazu 大阪府立大学, 工学(系)研究科(研究院), 准教授 (20350754)
Co-Investigator(Kenkyū-buntansha)	才田一幸大阪大学, 工学研究科, 教授 (30178470) 村川英一大阪大学, 接合科学研究所, 招へい教授 (60166270) 生島一樹大阪府立大学, 工学(系)研究科(研究院), 准教授 (80734003)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	溶接高温割れ / 片面サブマージアーク溶接 / 理想化陽解法FEM / AI / 割れ防止技術
Outline of Final Research Achievements	In this study, we first developed a metallurgical-mechanical hybrid type hot cracking analysis method that takes into account the direction of crystal growth, in order to advance and accelerate the hot cracking analysis method, and established a high-precision hot cracking analysis method that takes solidification segregation into account. Next, we established a cracking prevention technique using artificial intelligence (AI) and proposed a new experimental method for quantitative evaluation of critical strain. Furthermore, the proposed method was applied to full-scale hot cracking analysis of edge cracking during single-sided submerged arc welding in actual equipment, and a cracking prevention method was also proposed.
Free Research Field	船舶海洋工学
Academic Significance and Societal Importance of the Research Achievements	本研究は、割れに対する影響が顕著に見られる凝固成長方向および凝固偏析など、これまで学術的には冶金学的問題として検討されてきた影響因子を、有限要素法を用いた高温ひずみ解析(力学解析)に対し導入した。この解析手法は、世界的に見ても類例を見ない手法であり、本研究の成果として、世界初の冶金学・力学融合型高温割れ解析法が完成された。