High quality welding technology for thick plate with combination of diode laser and hot-wire method

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H01640
• 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): 2018-04-01 – 2021-03-31
• Keywords: ホットワイヤ法 / レーザ溶接 / 厚鋼板 / 1パス溶接 / 高強度・高靭性

Outline of Final Research Achievements

The welding technique combining the hot wire method and a high power diode laser (6kW x 2) was investigated as a low heat input, high quality welding method for thick steel plates (one pass butt joint of 20 mm thickness and one pass vertical butt joint of 50 mm thickness). By optimizing the shape of the rectangular laser beam and irradiation conditions (irradiation position, weaving, etc.), joints with sufficient strength and without defects were achieved for both joints.

Free Research Field

溶接・接合

Academic Significance and Societal Importance of the Research Achievements

大型船舶，橋梁，建築鉄骨，発電プラント，エネルギータンクなど，多くの重要インフラ製造分野において今後必要不可欠となる，高品質・高能率溶接技術の開発を目的としている。これまでのレーザ溶接と全く異なるコンセプトを提案・実現することで，施工裕度向上，溶接金属特性制御，自動化，高強度・高靭性母材の適用拡大なども可能となる。本溶接法の概念は他の様々な製品製造にも応用できるため，幅広い本研究成果の活用を検討している。