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伸一, 鈴木; 健次, 大井; 克行, 一宮; 靖, 木谷; 善明, 村上

doi:10.2320/materia.43.232

Cited by 5 publications

(3 citation statements)

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“…Moreover, heavy joint with over 70 mm need to join by large heat input with EGW process thereby grain coarsening on HAZ which leading to the toughness deterioration. As for above mentioned, to reduce plate thickness by keep more strength of steel plate, YP 47 (48)(49)(50)(51)(52)(53) steel was developed to use in the construction for a large-containership. YP 47 steel has yield point more than 460 N/mm 2 and it was produced by good TMCP technology, particularly in Japan.…”

Section: Evolution Of the Developed High Strength Steelmentioning

confidence: 99%

“…Nippon Steel Corporation develops steel plates for service on the largecontainer ship by super high HAZ technology with fine microstructure imparted by fine particles (54)(55)(56)(57)(58)(59) . Steel plates having a tensile strength of 490 MPa to 590 MPa for heavy thickness were made by addition fine particles of thermally stable oxides and sulfides in the plates.…”

Section: Fig 26 Comparison Of Haz Grain Growth Behaviors Between Comentioning

confidence: 99%

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Development of Vertical Welding Technology for Thick Steel Plate using Hot-wire Laser Welding Method

Yamamoto

Shinozaki

Yajima³

et al. 2016

Yosetsu Gakkai Shi

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Recently, larger container ships have been built for more efficiency of maritime transportation, consequently by the thicker of steel plates that have been used for its structure. Generally, "electrogas arc welding" (EGW) process, a single-pass vertical welding process having very high efficiency, has been used to join heavy-thick steel plates on the vertical direction in a ship building industry, especially in the part of a container ship structure such as a hatch side coaming. However, the EGW process causes very high heat input, which affects seriously on toughness deterioration of a welded joint, since it makes grains coarse and a heat affected zone (HAZ) width wide. Therefore, the novel vertical welding process with lower heat input is strongly demanded to join heavy-thick steel plates having high strength and high toughness. The present research proposes the novel vertical welding process for thick steel plates, using the laser diode as a heat source in combination with the hot-wire method, in order to achieve much lower heat input compared with the EGW process. This proposed welding process with low heat input should prevent grain growth and widening HAZ width and maintain toughness of a welded joint. In addition, the proposed process needs high efficiency by single-pass welding for thick steel plates in the vertical direction as with the EGW. In the proposed welding process, a high-power laser diode is used as a main heat source and the hot-wire method is used for efficient deposition. A large rectangular spot shape of a laser beam, which fits a groove width (gap) and plate thickness, is employed. The laser is irradiated continuously from the above the joint into the groove to create and keep a molten pool during welding. A reflected laser on a molten pool surface is utilized for melting groove surfaces efficiently. Filler wires are fed from both sides of the groove, and filler wires are heated up to its melting point by Joule heating using the hotwire system before entering the molten pool. YP-47 steel material for hull structure was used as base metal to joining for this research.

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Section: Evolution Of the Developed High Strength Steelmentioning

confidence: 99%

Section: Fig 26 Comparison Of Haz Grain Growth Behaviors Between Comentioning

confidence: 99%

Development of Vertical Welding Technology for Thick Steel Plate using Hot-wire Laser Welding Method

Yamamoto

Shinozaki

Yajima³

et al. 2016

Yosetsu Gakkai Shi

View full text Add to dashboard Cite

show abstract

“…JFE Steel has developed and realized practical application of steels for large heat input welding by utilizing the function of Ca inclusions as nuclei for the α transformation in order to improve HAZ toughness in large heat input welding joints in the shipbuilding and construction fields. These steels use Ca inclusions in control of the HAZ microstructure, which comprises mainly α microstructure 18) . However, it was newly found that the same inclusions Fig.…”

Section: Improvement Of Ctod Property Of Weld Jointmentioning

confidence: 99%

Offshore Structural Steel Plates for Extreme Low Temperature Service With Excellent HAZ Toughness

Ichimiya

Hase

Endo

et al. 2014

Volume 5: Materials Technology; Petroleum Technology

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The strength and the toughness required for steel plates used for offshore structures became higher as the installation areas move into arctic areas. The main property of offshore structure steel is the crack tip opening displacement (CTOD) property of weld joint, and CTOD testing is performed at the minimum design temperature of the structure. Thus, the demand for satisfying −40°C of CTOD test temperature specification has increased. For the improvement of HAZ toughness, coarse austenite grain is suppressed by TiN, and low-C, Ceq, Si, P, Nb design is adopted to decrease the formation of M-A constituents. Furthermore, by using Ca inclusion, which works as a pinning particle and a bainite nucleation site, very fine bainite microstructure are formed in HAZ and excellent low temperature toughness are achieved. The YP420 class plate with excellent low temperature toughness has been developed using these technology.

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2005 Trend of Welding & Joining in Japan Steel

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2006

Yosetsu Gakkai Shi

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Cited by 5 publications

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Development of Vertical Welding Technology for Thick Steel Plate using Hot-wire Laser Welding Method

Development of Vertical Welding Technology for Thick Steel Plate using Hot-wire Laser Welding Method

Offshore Structural Steel Plates for Extreme Low Temperature Service With Excellent HAZ Toughness

2005 Trend of Welding & Joining in Japan Steel

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