Hydrogen assisted cracking in C-Mn and low alloy steel weldments

Yurioka, Nobutaka; Suzuki, Hiroyuki

doi:10.1179/095066090790323957

Cited by 33 publications

(39 citation statements)

References 2 publications

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“…Other tests control the stress in the vicinity of the weldment in part through the shape of the welding groove. A U-groove (Lehigh U-groove test) favours crack formation at the root of the weld metal rather than in the HAZ while a y-groove (Tekken test) facilitates the cold cracking in the HAZ of the root of the weldment [3,4]. …”

Section: Guidance For Crack Locationmentioning

confidence: 99%

“…In addition, there is no huge disparity found in alloy rankings between different tests and laboratories [6]. In addition, there does not appear to be a large disparity between test rankings and perceived real-world behaviour [3,6]. However, even though the numerous existing tests appear to do a reasonable job of providing a rough comparison (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Cracking is generally believed to result from the tensile fracture at room temperature of a hydrogenated solid metal. Significant work has already been devoted to characterize weldability [1][2][3][4][5]. In addition, there is no huge disparity found in alloy rankings between different tests and laboratories [6].…”

Section: Introductionmentioning

confidence: 99%

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Towards the establishment of weldability test standards for hydrogen-assisted cold cracking

Kurji

Coniglio

2014

Int J Adv Manuf Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Our depth of understanding on these points has matured significantly over time and, while there is not always universal agreement, it is at least possible to start highlighting factors important to standards. This paper examines these factors, including the welding parameters, restraint, hydrogen, and cracking index. When comparing different alloys having different thermal characteristics, the use of constant welding parameters (common practice) will result in variable weld penetration and weld pool shape, which can influence grain shape and microstructural features, which can result in inequitable weldability comparisons. Welding on test coupons having different dimensions can affect restraint, which will influence the residual stresses around the weldment. High restraint usually results in higher crack susceptibility. Also, hydrogen content present in a weldment depends on the thermal history, welding parameters, and surrounding atmosphere humidity, with high hydrogen contents associated to great cracking susceptibility. Finally, the selection of an appropriate cracking index is required for data analysis. Quantifications of crack length and minimum preheat temperature are common indexes used for comparison. Critical stress and hydrogen content are other indexes. But how well these indexes actually represent weldability are contentious issues. This paper will examine and quantify these issues in detail, thus providing the reader with an appreciation of all things that must be considered when preparing a standardized procedure for weldability testing.

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Section: Guidance For Crack Locationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards the establishment of weldability test standards for hydrogen-assisted cold cracking

Kurji

Coniglio

2014

Int J Adv Manuf Technol

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“…선박을 건조할 때에 가장 빈번히 발생하는 용접결함 중 하나로, 그 발생요인과 대책에 대하여 오래전부터 많은 연구가 행하여져 왔다 (Watkinson, 1969;Savage et al, 1976;Savage et al, 1978;Vasudevan et al, 1981;Savage et al, 1982;Yurioka and Suzuki, 1990;Di-jing et al, 1994). 일반적으로는 용접부에 존재 하는 확산성수소가 미소균열의 선단 등 응력집중부에 확산하여 일정 양 이상 집적하면 격자의 결합력이 재료의 파괴강도 이하로 저하하여 균열이 전파한다고 알려져 있다 (Easterling, 1992) (Davidson, 1998;Kuebler et al, 2000).…”

Section: 서 론 용접금속 저온균열은 고장력강을 사용하여 해양구조물이나unclassified

“…The diffusible hydrogen contents were influenced by welding parameters such as the voltage and contact tip-to-work distance (CTWD (Watkinson, 1969;Savage et al, 1976;Savage et al, 1978;Vasudevan et al, 1981;Savage et al, 1982;Yurioka and Suzuki, 1990;Di-jing et al, 1994). …”

mentioning

confidence: 99%

Effects of Diffusible Hydrogen Content and Hardness on Cold Cracking in High Strength Weld Metal

Seo¹,

Bang²

2012

Journal of Ocean Engineering and Technology

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The effects of the diffusible hydrogen content and hardness on the cold cracking in high strength weld metal were investigated. The diffusible hydrogen contents were influenced by welding parameters such as the voltage and contact tip-to-work distance (CTWD (Watkinson, 1969;Savage et al., 1976;Savage et al., 1978;Vasudevan et al., 1981;Savage et al., 1982;Yurioka and Suzuki, 1990;Di-jing et al., 1994).

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Effect of Heat Input on the Microstructure and Mechanical Properties of Low Alloy Ultra‐High Strength Structural Steel Welded Joint

Wen

Wang

Deng

et al. 2018

steel research int.

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Microstructural evolution and mechanical properties of an ultra-high strength structural steel welded joint at different heat inputs are investigated by metal active gas arc (MAG) welding technique. It is found that the microstructure of weld metal (WM) contained high volume fraction of acicular ferrite regardless of heat input. However, the acicular ferrite changes from bainite acicular ferrite (B-AF) to Widmanstätten acicular ferrite (WF-AF) with the increase in heat input. The microstructure of coarse grain heat affected zone (CGHAZ) is characterized by complete martensite, a mixture microstructure (lath martensite and bainite), and granular bainte, respectively, with increasing heat input from 7.5 to 10.5 and then to18.5 kJ cm À1 . The acicular ferrite in WM nucleated at complex oxide inclusions and the number density of inclusions with the size of %0.6-1.2 mm significantly increases with the increase in heat input. The maximum drop of strength (113 MPa) occurs when the heat input is up to 18.5 kJ cm À1 . High volume fraction of acicular ferrite in WM improves the impact toughness because of increased proportion of high angle grain boundaries and interlocking structure. The heat input should be higher than 7.5 kJ/cm to avoid the formation of welding cold crack and twinned martensite in CGHAZ.

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Hydrogen assisted cracking in C-Mn and low alloy steel weldments

Cited by 33 publications

References 2 publications

Towards the establishment of weldability test standards for hydrogen-assisted cold cracking

Towards the establishment of weldability test standards for hydrogen-assisted cold cracking

Effects of Diffusible Hydrogen Content and Hardness on Cold Cracking in High Strength Weld Metal

Effect of Heat Input on the Microstructure and Mechanical Properties of Low Alloy Ultra‐High Strength Structural Steel Welded Joint

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