Mechanical Properties and Microstructures of High Heat Input Welded Tandem EGW Joint in EH36-TM Steel

Jeong, Hongchul; Park, Young-Hwan; An, Young-Ho; Lee, Jong–Bong

doi:10.5781/kwjs.2007.25.1.057

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…However, the toughness drastically decreased after the CGHAZ simulation regardless of the addition of Nb, while both base steels absorbed over 300 J. Considering the conditions of weld heat input for the simulated CGHAZ, the grain coarsening behavior was restricted compared to the previous reports 19) . Choi et al investigated HAZ characteristics in EH36-TM steel with heat input of 342 kJ/cm, having grain size of 348 μm 20) .…”

Section: Resultsmentioning

confidence: 77%

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Jeong¹,

Hong²,

Seo³

et al. 2022

J Weld Join

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In this paper, the effect of the electro gas arc welding (EGW) process with a heat input of 600 kJ/cm on the microstructural and mechanical characteristics was investigated for two types of EH40 high strength hull structural steels, containing Ti and Nb. The coarse grain heat affected zone (CGHAZ), with a peak temperature of 1450 °C, was simulated for both alloys using a material thermal cycle simulator. Tensile and Charpy impact toughness tests were performed to determine the mechanical properties of the CGHAZ, and microstructural analysis was performed using scanning electron microscopy and transmission electron microscopy. Both alloys exhibited a significant loss of impact toughness because of the welding thermal cycle, causing the formation of a brittle phase and the growth of precipitates. The experimental results indicated that although the addition of Ti and Nb had several benefits on mechanical properties, this might be unsuitable for the EGW process owing to the resulting deterioration in impact toughness.

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Section: Resultsmentioning

confidence: 77%

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Jeong¹,

Hong²,

Seo³

et al. 2022

J Weld Join

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“…In the case of container ships, which possess several holds specifically for loading containers, heavy thick steel plate is generally used for the upper deck and hatch coating because they withstand stress concentrations to achieve stability in their structures [5][6][7][8]. In manufacturing the heavy thick steel member, the highly efficient manufacturing technique of the electro gas welding (EGW) process, which involves a large heat input process, is practically unavoidable due to the limitations of the current flux cored arc welding (FCAW) process of the conventional multilayer welding process in terms of productivity [9][10][11][12][13][14]. On the other hand, EGW is expected to have weaker fatigue strength and undergo brittle fracture due to its large heat input.…”

mentioning

confidence: 99%

“…Figure 1, as well as Tables 3 and 4 provide the details of the welding joint shape and the number of layers for the EGW and FCAW welded joints, respectively. The CTOD test of the B B type using a 3-point bending test was carried out in accordance with the BS7448 Standard to examine the fracture toughness in the fusion line where lowest fracture toughness might be encountered [11][12][13][14]. The CTOD test was performed for two types of surface notch and through thickness notch, which are located on CGHAZ, as shown in Fig.…”

mentioning

confidence: 99%

Mechanical Behavior of the Weld Joints of Thick Steel Plates Produced by Various Welding Processes

Bang

Jeong

2015

Strength Mater

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The effect of a welding process (electrogas welding (EGW) and flux cored arc welding (FCAW)) on the fracture toughness, CTOD (crack tip opening displacement), and mechanical properties (tensile, bending, impact strengths and hardness) of thick weld joints is examined. The CTOD value of the FCAW weld joints was higher than that of the EGW ones. The fractured welded specimen after the CTOD test reveals ductile and cleavage fractures of the weld joint faces after flux cored arc and electrogas weldings, respectively. The mechanical properties of the EGW welded specimens satisfied relevant classification rules. These results suggest that the EGW process is an effective substitute for the current welding process (FCAW) used for high-strength thick steel plates.

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“…Along with this trend, such as container ships above 8000TEU, the use of high strength (>355N/mm 2 ) and thick steel plates EH36/EH40 (>70mm) in the construction of large sized ships has increased rapidly to satisfy the reduction of weight and increase the longitudinal strength of ships [4][5][6][7] . The application of these ultra thick steel plates, however, place high demand on the workload for welding.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the welding residual stress and fracture toughness of the heavy thick steel welded joints by welding processes

Bang

2015

Journal of Welding and Joining

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This study examined the welding residual stress and fracture toughness of 78mm thick steel electro gas welding (EGW) and flux cored arc welding (FCAW) welded joints by numerical analyses of the thermal elasto-plastic behavior and fracture toughness(KIC). The residual stress, fracture toughness characteristics and production mechanism on the welded joints were clarified. Moreover, the effects of the welding process (EGW and FCAW) on the welding residual stresses and fracture toughness of welded joints were evaluated. The results showed that the new welding process (EGW) appears to be an effective substitute for the existing welding process (FCAW) in a thick steel plate with high strength.

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Mechanical Properties and Microstructures of High Heat Input Welded Tandem EGW Joint in EH36-TM Steel

Cited by 10 publications

References 2 publications

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Mechanical Behavior of the Weld Joints of Thick Steel Plates Produced by Various Welding Processes

Numerical analysis on the welding residual stress and fracture toughness of the heavy thick steel welded joints by welding processes

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