Development of Submerged arc Welding Method in a Vertical Upward Position

Sakamoto, Rie; Kobayashi, Kenzo; IIJIMA, Tooru; Mizo, Yutaka

doi:10.1007/bf03321366

Cited by 6 publications

(5 citation statements)

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“…2a. On the other hand, the actual on-site manufacturing of large LNG storage tanks is carried out using not only flat welding position, but also horizontal (2G) and vertical (3G) positions [14,57]. In this concern, the optimum welding parameters achieved for flat welding position (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Application of Hybrid Laser Arc Welding for Construction of LNG Tanks Made of Thick Cryogenic 9% Ni Steel Plates

Gook,

El-Batahgy,

Gumenyuk

et al. 2023

Lasers Manuf. Mater. Process.

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Hybrid laser-arc welding (HLAW) was applied for butt welding of 14.5 mm thick plates of ferritic cryogenic steel X8Ni9 containing 9% Ni, which is used for manufacturing storage and transport facilities of liquefied natural gas (LNG). The weld seam formation and the achievable metallurgical and mechanical properties of the hybrid welds were investigated experimentally for two types of filler wire, an austenitic wire dissimilar to the base metal (BM) and an experimentally produced matching ferritic wire. Safe penetration and uniform distribution of the austenitic filler metal in the narrow hybrid weld could only be achieved in the upper, arc-dominated part of the weld. The pronounced heterogeneous distribution of the austenitic filler metal in the middle part and in the root area of the weld could not ensure sufficient notched impact toughness of the weld metal (WM). As a result, a decrease in the impact energy down to 17 ± 3 J was observed, which is below the acceptance level of ≥ 34 J for cryogenic applications. In contrast, the use of a matching ferritic filler wire resulted in satisfactory impact energy of the hybrid welds of up to 134 ± 52 J at the concerned cryogenic temperature of -196 °C. The obtained results contribute to an important and remarkable conversion in automated manufacturing of LNG facilities. In other words, the results will help to develop a new laser-based welding technology, where both quality and productivity are considered.The efficiency of the developed welding process has been demonstrated by manufacturing a prototype where a segment of the inner wall of large size LNG storage tank was constructed. In this concern, hybrid laser arc welding was conducted in both horizontal (2G) and vertical (3G) positions as a simulation to the actual onsite manufacturing. The prototype was fabricated twice where its quality was confirmed based on non-destructive and destructive examinations.

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Section: Discussionmentioning

confidence: 99%

“…Welding can be performed in different positions. A novel vertical SAW process has been developed for this purpose [14]. It uses a small-diameter filler wire and a waving technique to control the weld pool.…”

Section: Introductionmentioning

confidence: 99%

Application of Hybrid Laser Arc Welding for Construction of LNG Tanks Made of Thick Cryogenic 9% Ni Steel Plates

Gook,

El-Batahgy,

Gumenyuk

et al. 2023

Lasers Manuf. Mater. Process.

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“…It is well known that steels' welding relies on the optimum size and number density of nonmetallic inclusions as a potent heterogeneous nucleation site, which promotes acicular ferrite (AF) formation [13][14][15]. The best impact toughness in steels is achieved through AF due to the high angle grain boundaries (HAGB) density and chaotic ne interlocking sheaves microstructure [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical evaluations of SAW by manufactured granular basic bonded Cr, Mo, and Cr–Mo active fluxes on ST37 low carbon steel

Alishavandi

Mohammadmirzaei

Ebadi

et al. 2022

Int J Adv Manuf Technol

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Bead-on-plate submerged arc welding was conducted on St37 steel by manufactured Cr, Mo, and Cr-Mo active basic uxes produced via the unfused bonded method. The base metal heat-affected zone and weld metal (WM) microstructures were identi ed and characterized by optical microscopy and scanning electron microscopy. Then, the ferrite morphologies volume fraction of WMs were measured. Moreover, the chemical analysis of slag and inclusions was evaluated by point scan energydispersive X-ray spectroscopy and extensively discussed. Inclusions number density and size and their effects on the formation of AF were also elaborated. Then, the WMs' longitudinal tensile strength and Vickers hardness were measured.Finally, the Charpy V-notch test was conducted to determine the impact toughness; the fracture surfaces were investigated, as well.

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Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Evaluations of SAW By Manufactured Granular Basic Bonded Cr, Mo, and Cr-Mo Active Fluxes on ST37 Low Carbon Steel

Alishavandi

Mohammadmirzaei

Ebadi

et al. 2021

Preprint

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Bead-on-plate submerged arc welding was conducted on St37 steel by manufactured Cr, Mo, and Cr-Mo active basic fluxes produced via the unfused bonded method. The base metal heat-affected zone and weld metal (WM) microstructures were identified and characterized by optical microscopy and scanning electron microscopy. Then, the ferrite morphologies volume fraction of WMs were measured. Moreover, the chemical analysis of slag and inclusions was evaluated by point scan energy-dispersive X-ray spectroscopy and extensively discussed. Inclusions number density and size and their effects on the formation of AF were also elaborated. Then, the WMs’ longitudinal tensile strength and Vickers hardness were measured. Finally, the Charpy V-notch test was conducted to determine the impact toughness; the fracture surfaces were investigated, as well.

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Development of Submerged arc Welding Method in a Vertical Upward Position

Cited by 6 publications

References 0 publications

Application of Hybrid Laser Arc Welding for Construction of LNG Tanks Made of Thick Cryogenic 9% Ni Steel Plates

Application of Hybrid Laser Arc Welding for Construction of LNG Tanks Made of Thick Cryogenic 9% Ni Steel Plates

Microstructural and mechanical evaluations of SAW by manufactured granular basic bonded Cr, Mo, and Cr–Mo active fluxes on ST37 low carbon steel

Microstructural and Mechanical Evaluations of SAW By Manufactured Granular Basic Bonded Cr, Mo, and Cr-Mo Active Fluxes on ST37 Low Carbon Steel

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