Development of Welding Materials for High Heat Input Welding Compatible with Thick Steel Plates of 460 MPa Yield Point Class for Very Large Container Ships

Hashiba, Yuuji; Sasaki, Kiyohito; Kasuya, Tadashi; Inoue, Tatsuo; Funatsu, Yuuji

doi:10.1007/bf03263482

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…In the shipbuilding industry, high deadweight ships demand thicker steel plates to be used in the hull structure [1]. However, such thicker steel plates require multi-pass welding in the manufacturing process, which will reduce productivity and, invariably, lead to unexpected costs [2]. In practice, to avoid such scenario, traditional multi-pass welding technology has been gradually replaced by high heat input welding techniques [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…However, such thicker steel plates require multi-pass welding in the manufacturing process, which will reduce productivity and, invariably, lead to unexpected costs [2]. In practice, to avoid such scenario, traditional multi-pass welding technology has been gradually replaced by high heat input welding techniques [2][3][4][5]. It is worth noting that welds in certain vertical positions usually adopt electro-gas welding (EGW) to achieve single-pass welding with high heat input [2].…”

Section: Introductionmentioning

confidence: 99%

“…In practice, to avoid such scenario, traditional multi-pass welding technology has been gradually replaced by high heat input welding techniques [2][3][4][5]. It is worth noting that welds in certain vertical positions usually adopt electro-gas welding (EGW) to achieve single-pass welding with high heat input [2]. EH420 shipbuilding steel is a typical high-strength lowalloy (HSLA) steel for hull structure applications, which have markedly cryogenic toughness and excellent weldability [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Heterogeneous Microstructure-Induced Mechanical Responses in Various Sub-Zones of EH420 Shipbuilding Steel Welded Joint Under High Heat Input Electro-Gas Welding

Xie

Zhao²,

Zhao

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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Heterogeneous microstructure-induced mechanical responses in EH420 shipbuilding steel welded joint by electro-gas welding processed have been systematically studied by scanning electron microscopy, electron backscatter diffraction and mechanical testing. Comparing with the coarse-grained heat-affected zone (CGHAZ), the weld metal presents higher toughness (129.3 J vs. 37.3 J) as it contains a large number of acicular ferrites with high-angle grain boundaries (frequency 79.2%) and special grain boundary ∑3 (frequency 55.3%). Moreover, coarse austenite grains in CGHAZ and slender martensite-austenite constituents between bainite laths may likely facilitate crack propagation. Polygonal ferrites and tempered pearlites formed at the junction of the fine-grained heat-affected zone and the intercritical heat-affected zone induced a softened zone with an average hardness of 185 HV0.5, which is the main reason for the occurrence of tensile fracture.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heterogeneous Microstructure-Induced Mechanical Responses in Various Sub-Zones of EH420 Shipbuilding Steel Welded Joint Under High Heat Input Electro-Gas Welding

Xie

Zhao²,

Zhao

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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“…In this case, to refine the grains in FCB high input welding process and enhance the toughness of weld metal are some of the key techniques to be solved. 1 In last decades, lots of studies have noticed some beneficial inclusions, such as TiO, TiN, MnS, CuS, etc., promote the nucleation of acicular ferrite (AF), which can refine the grains and improve the strength and toughness of the weld metals. [2][3][4][5][6] However, these beneficial inclusions tend to gather and overgrow in FCB submerged arc welding, which may reduce the promoting effects of the inclusions to the nucleation of AF.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, to refine the grains in FCB high input welding process and enhance the toughness of weld metal are some of the key techniques to be solved. 1…”

Section: Introductionmentioning

confidence: 99%

Inclusions, microstructure and properties of flux copper backing submerged arc weld metal

Yan¹,

Shi²,

Chen³

2015

Science and Technology of Welding and Joining

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This paper investigates the effect of Ce on inclusions, microstructure and mechanical properties of the weld metal in flux copper backing submerged arc welding. The results show, with the addition of Ce in weld metal, the inclusions are mainly composed of Al 2 O 3 , MnO, SiO 2 , TiO, Ce 2 S 3 , CeS and Ce 2 O 2 S compound, and the proportion of the inclusions of ,1.0 mm in size increased. In competitive nucleation, acicular ferrite nucleates on the oxysulphides of Ce and inhibits the formation of proentectoid ferrite and ferrite side plate. This led to a high proportion of acicular ferrite, good mechanical properties of weld metal. A small lattice disregistry between CeS, Ce 3 S 4 , Ce 2 O 2 S and acicular ferrite contributed to low energy for nucleation of acicular ferrite.

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A study on sidewall penetration of cable-type welding wire electrogas welding

et al. 2017

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Development of Welding Materials for High Heat Input Welding Compatible with Thick Steel Plates of 460 MPa Yield Point Class for Very Large Container Ships

Cited by 7 publications

References 2 publications

Heterogeneous Microstructure-Induced Mechanical Responses in Various Sub-Zones of EH420 Shipbuilding Steel Welded Joint Under High Heat Input Electro-Gas Welding

Heterogeneous Microstructure-Induced Mechanical Responses in Various Sub-Zones of EH420 Shipbuilding Steel Welded Joint Under High Heat Input Electro-Gas Welding

Inclusions, microstructure and properties of flux copper backing submerged arc weld metal

A study on sidewall penetration of cable-type welding wire electrogas welding

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