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

• 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
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000); Fiscal Year 2020: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2019: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2018: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
• 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 / 高出力半導体レーザ / ホットワイヤ / 狭開先 / 立向き1パス / 半導体レーザ / 中厚板材料 / 高品質溶接技術 / 低入熱 / モニタリング / 大型船舶 / 中厚鋼板 / 下向き突合せ継手 / 立向き突合せ継手

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.

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。

Research Products

• [Journal Article] Optimization of Laser-Irradiating Conditions for Vertical Welding on Thick Steel Plate using Hot-Wire Laser-Welding Method (2019)
  • Author(s): SITTISAK Charunetratsamee、EAKKACHAI Warinsiriruk、SHINOZAKI Kenji、YAMAMOTO Motomichi
  • Journal Title: QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Volume: 37 Issue: 4 Pages: 187-192
  • DOI: 10.2207/qjjws.37.187
  • NAID: 130007732166
  • ISSN: 0288-4771, 2434-8252
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Melting by Reflected Laser Beam during Vertical Welding via Hot-Wire Laser Welding (2019)
  • Author(s): SITTISAK Charunetratsamee、EAKKACHAI Warinsiriruk、SHINOZAKI Kenji、YAMAMOTO Motomichi
  • Journal Title: QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Volume: 37 Issue: 4 Pages: 208-214
  • DOI: 10.2207/qjjws.37.208
  • NAID: 130007749645
  • ISSN: 0288-4771, 2434-8252
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] ホットワイヤ・レーザ法を用いた狭開先多層溶接の適正溶接条件の導出 (2020)
  • Author(s): 丸本 啓太
  • Organizer: 溶接学会秋季全国大会
• [Presentation] Development of Vertical Welding Process for Heavy-thick Steel Plate using Hot-wire Laser Welding (2019)
  • Author(s): Sittisak Charunetrasamee, Motomichi Yamamoto
  • Organizer: IIWAP2019
  • Int'l Joint Research
• [Presentation] ホットワイヤ・レーザ溶接法を用いて作製した厚鋼板立向き1パス溶接継手の特性 (2018)
  • Author(s): Sittisak Charunetrasamee, 山本元道
  • Organizer: 溶接学会秋季全国大会