Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Schubnell, Jan; Ladendorf, Phillip; Sarmast, Ardeshir; Farajian, Majid; Knödel, Peter

doi:10.3390/met11020293

Cited by 9 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Residual stress measurements by X-ray diffraction of test series H to M 35 and N 36 in as-welded conditions showed a low residual stress level at the surface of the weld toe. However, numerical assessment of the residual stresses by structural welding simulation of welded joints H to M 33 showed a higher tensile residual stress level below the surface layer. Because of the mentioned uncertainties, welding residual stresses are not considered in the current study.…”

Section: Consideration Of Welding Residual Stressesmentioning

confidence: 90%

“…A method is proposed and tested in this study for the probabilistic fatigue assessment of welded joints based on their individual geometrical parameters using a combination of methods from previous studies. 17,20,27,28 The geometrical parameters were evaluated from 3D surface scans of 26 test series from previous studies [30][31][32][33][34][35][36] of welded joints.…”

Section: Discussionmentioning

confidence: 99%

“…In nearly all the welded joints investigated, this information was not available. Residual stress measurements by X‐ray diffraction of test series H to M 35 and N 36 in as‐welded conditions showed a low residual stress level at the surface of the weld toe. However, numerical assessment of the residual stresses by structural welding simulation of welded joints H to M 33 showed a higher tensile residual stress level below the surface layer.…”

Section: Probabilistic Fracture Mechanics Analysismentioning

confidence: 94%

“…The geometrical parameters and fatigue test results taken from previous studies [30][31][32][33][34][35][36] and other unpublished investigations are summarized in Table 1. These data contain 390 single fatigue tests with four different types of welded joints: single V-butt joints, double V-butt joints, cruciform joints, and T-joints.…”

Section: Materials and Specimensmentioning

confidence: 99%

See 3 more Smart Citations

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Schubnell,

Konidena,

Jung

et al. 2023

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

Welded joints show large variation of the weld toe geometry along the weld seam, which is one important reason for the comparably large scatter in fatigue life. Therefore, it is crucial to take the local geometry at the weld toe into account, to reduce the conservatism in fatigue assessment of welded joints. This study is based on the IBESS procedure for the calculation of the fatigue strength, whereby the evaluation of local geometrical parameters is carried out by means of 3D surface scans. The approach is validated against 26 fatigue test series. The fatigue life is in general overpredicted, whereas good agreement is achieved for high stress ratio ( ). A sensitivity analysis conducted with IBESS shows that weld toe radii ρ < 2 mm and flank angle α < 30° have a significant influence on the calculated fatigue strength. In contrast to this, no strong correlation between and the fatigue strength was determined experimentally in this study.

show abstract

Section: Consideration Of Welding Residual Stressesmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Probabilistic Fracture Mechanics Analysismentioning

confidence: 94%

Section: Materials and Specimensmentioning

confidence: 99%

See 2 more Smart Citations

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Schubnell,

Konidena,

Jung

et al. 2023

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…Studies on repair welding are conducted in the fields of piping components, aeronautic structures, and bridges, and most of them focused on changes in the mechanical properties, microstructure, and residual stress of the weld zone after repair welding. 6–12 Luo et al 6 investigated the effect of the welding heat input in repair welding using 304 stainless steel. They reported that cracks easily occur when the welding heat input is small because the mechanical properties of the heat-affected zone (HAZ) deteriorate.…”

Section: Introductionmentioning

confidence: 99%

Effect of multiple weld repairs on fatigue strength of bogie frame of railroad vehicle

Seo,

Hur,

Kwon

et al. 2023

Advances in Mechanical Engineering

View full text Add to dashboard Cite

In the welded structure of railroad vehicles, the bogie frame requires a service life more than 25 years, cracks occur in the weld zone owing to the application of repetitive fatigue loading during operation. When cracks occur and propagate in the weld zone, they are removed through gouging, and gas metal arc welding is performed for repair. After the first weld repair, the second weld repair process is performed if crack is visible in the same area. In this study, the effects of repetitive repair welding on the fatigue characteristics were investigated using materials applied in railway vehicle structures. Three types of specimens (weld specimen, first weld repairs specimen, and second weld repairs specimen) were prepared, and fatigue and residual stress tests were performed. The results indicated that the weld specimen had the longest fatigue life, and the first weld repairs specimen had the shortest fatigue life. The fatigue life of the second weld repairs specimen was longer than that of the first weld repairs specimen. Residual stress tests and finite-element analysis results indicated that the first weld repairs specimen had the shortest fatigue life among the specimens tested, because the highest residual stress was generated.

show abstract

Inter-relationship between residual stresses, microstructural evolutions, and mechanical responses of heat-treatable aluminum alloys during welding: a numerical and experimental study

Sarmast,

Serajzadeh

2023

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

Welding of heat treatable aluminum alloys poses a significant challenge due to the formation of unwanted microstructural changes, inferior mechanical properties, and formation of residual stresses (RS). An understanding of the inter-relationship between these aspects is crucial for the successful design of welding procedures. Given the complexity of these materials, a combination of numerical and experimental investigations is necessary to address this interrelationship. In this work, the effect of welding heat input on the post-weld precipitation hardening, changes in mechanical properties, RS formation, and their inter-relationship in different welding regions of the heat treatable AA2024 was numerically and experimentally studied. Two different thicknesses of the base material, 3.5 mm and 6 mm were chosen to investigate the effect of different heat inputs and geometries. The results show that the highest RS are formed in the partially melted zone (PMZ) and heat affected zone (HAZ), with values of 300 MPa and 221 MPa, respectively, for the 6 mm sample, where the mechanical properties and microstructure were most affected. These high tensile RS accelerate the age hardening process of these regions, resulting in 20 HV changes in the PMZ and 14 HV changes in the HAZ in 70 days. The strength of the material due to these microstructural evolutions determined the load bearing of each region and their maximum RS.

show abstract

Fatigue Performance of High- and Low-Strength Repaired Welded Steel Joints

Cited by 9 publications

References 24 publications

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Effect of multiple weld repairs on fatigue strength of bogie frame of railroad vehicle

Inter-relationship between residual stresses, microstructural evolutions, and mechanical responses of heat-treatable aluminum alloys during welding: a numerical and experimental study

Contact Info

Product

Resources

About