Manufacture of thick-walled pressure vessels in particular consideration of advanced welding processes and measures for quality assurance

Clausmeyer, H.; Hantsch, H

doi:10.1016/0029-5493(91)90135-5

Cited by 3 publications

(2 citation statements)

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“…Meanwhile, it saves the expensive strategic Cr and Ni elements and reduces the fabrication cost, offering a wide range of development prospects [5,6]. Welding of stainless steel clad plate is an indispensable process to fabricate separators, pressure vessels, pulp digesters, heat exchanger shells and tube plates in gas, petrochemical industry and other fields [7][8][9][10][11]. Moreover, stainless steel clad plate often forms defects and cracks during the manufacturing or service process, which should be repaired by multiple welding to guarantee the integrity, safety and lifetime of the equipment [7,12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of stainless steel clad plate welding joints by different welding processes

Liu

Chen

et al. 2020

Science and Technology of Welding and Joining

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This work aims to study the microstructure and mechanical properties of stainless steel/carbon steel clad plate joints with three welding types: welding without transition layer, welding with transition layer using tungsten inert gas arc welding and shielded metal arc welding, respectively. Both of transition layer-weld metals contain ferrite + austenite phases obtained by different solidification modes. The brittle martensite zone is formed in the stainless steel weld metal without the transition layer because of the excessive diffusion of Cr, Ni elements. The clad plate joints with transition layer welded by shielded metal arc welding achieved the best welding quality without excessive alloy element dilution or formation of brittle phase, which reveals a perfect welding joint without obvious hardness gradient and obtains outstanding mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of stainless steel clad plate welding joints by different welding processes

Liu

Chen

et al. 2020

Science and Technology of Welding and Joining

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“…The thickness of reactor pressure vessel of VHTR may be above 100 mm, so it is important to select the welding method for the sound weld of thick-wall vessel. Among many welding methods, narrow gap welding (NGW) techniques have many advantages such as reduction of fabrication time, improvement of dimensional accuracy and reduction of coarse grain zone in the heat affected zone (HAZ) [4,5]. The NGW equipment needs high demands on accuracy of positioning and manipulation of wire in the narrow gap and the optimizing welding parameters are required to avoid the higher tendency to forming fusion defects, because the narrow weld gap makes difficulty in repairing defects.…”

Section: Introductionmentioning

confidence: 99%

Welding Soundness of a Thick-Walled 9Cr-1Mo Steel

Ryu

Kim

2010

MSF

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Abstract. High Cr ferritic/martensitic steels are demanded to join using favorable welding processes with economical and metallurgical advantages in order to apply to the thick-walled reactor pressure vessel of a very high temperature gas cooled reactor. Narrow gap welding technology was adopted to weld a thick-walled 9Cr-1Mo-1W steel with thickness of 110mm. The welding integrity was checked by non-destructive examination, optical microscopy and hardness test, and the homogeneity through welding depth was checked by absorbed impact energy and tensile strength. The optimizing welding conditions resulted that a narrow U-grooved gap with almost parallel edges was sound in actual practice, and the coarse grain zone was minimized in the heat affected zone. The absorbed energy of 75±25 J through welding depth was acceptable in scatter band to check the uniformity through the welding depth. The ultimate tensile stress and yield stress were about the same through welding depth at 650±10 MPa and 500±10 MPa, indicating no difference through welding depth. Elongation was also almost same through depth, and the fracture surface was appeared as a normal. The weld metal had similar mechanical properties to base metal. The upper self energy of weld metal was 194J, and the ductile-brittle transition temperature was 30°C. The tensile behavior was the typical trend with temperature, and YS and UTS of weldment were slightly higher than base metal by nearly below 10%. Thus, it concluded that the soundness of the narrow gap welding of a thick-walled 9Cr-1Mo-1W steel was confirmed in terms of the welding uniformity through the depth and mechanical properties.

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Monte Carlo simulation of stress corrosion cracking in welded metal with surface defects and life estimation

Fujii,

Ogasawara,

Tohgo

et al. 2024

International Journal of Mechanical Sciences

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Manufacture of thick-walled pressure vessels in particular consideration of advanced welding processes and measures for quality assurance

Cited by 3 publications

References 0 publications

Microstructure and mechanical properties of stainless steel clad plate welding joints by different welding processes

Microstructure and mechanical properties of stainless steel clad plate welding joints by different welding processes

Welding Soundness of a Thick-Walled 9Cr-1Mo Steel

Monte Carlo simulation of stress corrosion cracking in welded metal with surface defects and life estimation

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