| Project/Area Number |
26630458
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
Gotoh Koji 九州大学, 工学(系)研究科(研究院), 准教授 (60274487)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | レーザ・アークハイブリッド溶接 / 溶接施工条件 / 仮付け溶接 / 溶接 / 船殻建造 / レーザ |
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| Outline of Final Research Achievements |
Laser-arc hybrid welding technology, which has the advantages of laser and normal arc welding, provides high-quality welds and is expected to improve productivity and accuracy. A strong advantage of laser-arc hybrid welding is its low heat input compared with conventional arc welding. Large reductions in residual welding deformation are expected when applying laser-arc hybrid welding. Such improvements will increase the productivity of hull construction and permit structural styles that reduce the net weight of a hull. Meanwhile, the large-scale constraint device of members must be equipped in the laser-arc hybrid welding systems to fabricate high quality welded joints.
New tack welding procedure, which laser irradiation without filler wire was applied to melt the region of connection to fix between the stiffener and base plate, is proposed and verified by macroscopic observation of weld bead appearance and cross section, measurement of angular distortion and fatigue tests.
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