Effect of weld geometry on the fatigue life of non-load-carrying fillet welded cruciform joints

Lee, Chin-Hyung; Chang, Kyong-Ho; Jang, Gab-Chul; Lee, Chanyoung

doi:10.1016/j.engfailanal.2008.07.004

Cited by 59 publications

(20 citation statements)

References 12 publications

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“…For non-load carrying welds, the throat size has an even minor influence. The local weld toe geometry and its radius are instead of the highest importance [7,9]. This influence is shown in Fig.…”

Section: Weld Quality and Weld Demandsmentioning

confidence: 99%

A new innovative toolbox for lean welding of fatigue loaded structures

Åstrand

2015

Int J Adv Manuf Technol

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Welding is a key manufacturing technology in the production of heavy steel structures, but it is likewise a weak link in the production chain since fatigue fractures in welds is a common cause of failures. This paper proposes several changes in the process to make the manufacturing more efficient and to improve the fatigue properties. The idea is to adopt the weld quality demands for the purpose of the weld and to connect them to the welding procedures. This approach ensures that the primary focus during welding is at the critical characteristics which add value to the welded structure through an enhanced fatigue life. These fatigue life-critical properties have been found to be related to the local weld geometry in the weld toe and at the weld root. Traditional demands related to the good workmanship of welding can often be neglected, due to its limited effect to the fatigue life. The research presented in this paper has contributed to the development of welding procedures for improved fatigue life properties at the critical points of the weld. Results indicate a considerable potential for enhanced fatigue life of fillet welds. The idea is to replace the standard fillet welds with a new toolbox containing three different welds: (i) welds with optimized penetration, (ii) welds with optimized weld toe, and (iii) welds with a low cost. Right usage of these weld types contributes to an efficient production that offer a long fatigue life. This paper describes ErikÅstrand a holistic view of the subject and highlights issues with the traditional way of working. The challenge and the novelty in the paper are the connection between the welding process, weld demands, and fatigue life properties. This connection is necessary for the development of welding procedures that can contribute to the fabrication of weight optimized welded structures with a predictable life.

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Section: Weld Quality and Weld Demandsmentioning

confidence: 99%

A new innovative toolbox for lean welding of fatigue loaded structures

Åstrand

2015

Int J Adv Manuf Technol

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“…Such parameters to be considered are flank angle, weld toe and weld throat thickness [6][7][8]. The definitions of flank angle, h and weld toe radius, q are described in Fig.…”

Section: Geometrical Conditionmentioning

confidence: 99%

Comprehensive study of structural integrity of non-load-carrying fillet-welded joint effect with large gap size

2015

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The structural integrity of the fillet-welded joint with large gap sizes made by semi-automatic CO 2 gas shielded welding is investigated to suggest for the improvement of construction quality standards. An allowable limit on the gap size of welded joints is specified in many construction quality standards based on experimental and empirical results from the welded joints made by manual metal arc welding. Mechanical tests such as hardness, tensile, bending and fatigue were performed to confirm the welded specimen's quality. Macro observation and dye penetrants inspection were performed on the welded specimen face and weld toe area to verify if any defects are present. Obtained S-N curves from experimental results for the welded specimen with large gap present higher performance compared to the fatigue design S-N curves proposed by the International Institute of Welding (IIW) and UK-HSE.Keywords Welded joint with large gap Á Non-loadcarrying fillet-welded joint Á Fatigue performance Á CO 2 gas shielded welding Á Hot spot stress Á Mechanical properties of a welded joint

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“…Since the radius has shown to have strong influence on fatigue life according to, among others, Lee et al [8] and Jonsson et al [5], it is therefore included in corporate weld standards, such as Volvo standard 181-0004 [9]. Since this demand is rather company-specific and not included in the common standard ISO 5817 [10], there is also no existing common evaluation method used.…”

Section: Fig 2 Illustration Of Weld Toe Radiusmentioning

confidence: 99%

Facilitating decision-making by choosing an NDT method based on information need

Öberg

Hammersberg

2016

Weld World

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This paper discusses the choice of an NDT method (non-destructive testing) from an information need perspective. It bridges the gap between technical methods, monitoring procedures and the need for information in an industrial application. The simple pull approach described starts from the decision that needs to be taken rather than from a previous data push procedure. That makes it more likely to match the method with the actual need, which leads to more effective and efficient evaluations. The pull approach is described by using a case from the welding industry, evaluation of the weld toe radius. The toe radius, defining how smooth the transition between the plate and the weld is, has been found critical to fatigue strength. Depending on the internal customer's need of information, various evaluation solutions are preferred. The methods range from manual gauges to fully automated camera solutions. An interview study performed shows that the current process for choosing evaluation method differs. The person needing the information is often not the starting point in the process. A change in starting point influences both the choice of NDT method and visualization and thereby how efficient and effective the decision-making support will be. The financial effect is significant.

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Effect of weld geometry on the fatigue life of non-load-carrying fillet welded cruciform joints

Cited by 59 publications

References 12 publications

A new innovative toolbox for lean welding of fatigue loaded structures

A new innovative toolbox for lean welding of fatigue loaded structures

Comprehensive study of structural integrity of non-load-carrying fillet-welded joint effect with large gap size

Facilitating decision-making by choosing an NDT method based on information need

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