Development of high-efficiency and high-quality using hybrid welding technology by combining hot-wire metho

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01548
• 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: Hiroshima University
• Principal Investigator: Yamamoto Motomichi 広島大学, 先進理工系科学研究科(工), 教授 (30274111)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 高性能材料 / ホットワイヤ / レーザ溶接 / 大型船舶

Outline of Final Research Achievements

The hot-wire welding method was applied to high-performance materials such as 9%Ni steel, which is expected to expand its application in the future, and a process was developed to achieve higher efficiency, lower deformation, defect prevention and improved joint properties. By combining the hot-wire method with arc and laser heat sources and applying the appropriate conditions, a significant improvement in the efficiency was achieved. By utilising the features of the hot-wire laser welding method, a one-pass vertical welding process for 9%Ni steel and an ultra-low deformation fillet welding process were achieved.

Free Research Field

溶接・接合工学

Academic Significance and Societal Importance of the Research Achievements

今後の舶建造分野における大型化や軽量化による輸送効率向上および燃費向上，あるいは新燃料（LNG，水素，アンモニアなど）の使用による大幅なCO2排出量削減などが検討されており，高性能材料の適用拡大が強く求められている。大型船舶は過酷な環境で稼働するとともに400mに達する大型溶接構造物であるため，高品質化と生産性向上とのこれまでにない高いレベルでの両立が必要不可欠になっている。本研究では，ホットワイヤ法とアークおよびレーザ熱源とを組み合わせた新しい溶接法を開発・適用し，上記課題に対して検討を行い，今後の日本造船業界に資する，これまで以上に効能率かつ高品質な溶接施工技術を実現することができた。