Experimental study on fatigue performance of resistance spot-welded sheet metals

Ertas, Ahmet H.; Akbulut, Mustafa

doi:10.1007/s00170-021-06822-z

Cited by 13 publications

(10 citation statements)

References 30 publications

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“…Manufacturers in the automotive industry face an increasingly competitive environment [1]. Remarkably, resistance spot welding (RSW) is a critical manufacturing technology in such sector [2], [3], since its high speed and adaptability for automation render it suitable for mass production [4]. The number of RSW joints per vehicle is very high (around 5000 according to Xia et al [5]), and there can be significant variability in the quality of each of them due to the fact that RSW is a complex process [6], [7]; more precisely, the heat generated by an electrical current has to be substantial enough to promote local melting and the formation of a weld nugget at the faying interface [8], [9], while at the same time the amount of heat is influenced by the electrical conductivity…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Classification Algorithms for Quality Assessment of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs

Martín¹,

Ahedo

Santos

et al. 2022

IEEE Access

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Resistance spot welding (RSW) is a widespread manufacturing process in the automotive industry. There are different approaches for assessing the quality level of RSW joints. Multi-input-singleoutput methods, which take as inputs either the intrinsic parameters of the welding process or ultrasonic nondestructive testing variables, are commonly used. This work demonstrates that the combined use of both types of inputs can significantly improve the already competitive approach based exclusively on ultrasonic analyses. The use of stacking of tree ensemble models as classifiers dominates the classification results in terms of accuracy, F-measure and area under the receiver operating characteristic curve metrics. Through variable importance analyses, the results show that although the welding process parameters are less relevant than the ultrasonic testing variables, some of the former provide marginal information not fully captured by the latter.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Classification Algorithms for Quality Assessment of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs

Martín¹,

Ahedo

Santos

et al. 2022

IEEE Access

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“…33 The first analytical model for assessing the adhesive shear stresses of bonded joints was developed by Volkersen in 1938. [38][39][40] His model is also called shearlag model, which neglects the bending moment. The adhesive shear stress distribution is defined in the Volkersen model as follows: where…”

Section: Introductionmentioning

confidence: 99%

Effects of single-lap joint at different adhesive thicknesses on fatigue strength of metals with different surface coatings

Baykara

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Adhesive technology defined as a kind of chemical bonding alternative to thermal and mechanical joints, has attracted the attention of industry people and researchers in various fields, especially in the automobile sector for the last 30 years. Therefore, this research study has aimed to consider the issue in the automotive industry, the adhesion performance was investigated for the cases in which a metal part was joined to a vehicle body both after applying coatings and primer paint respectively. İn this respect, some of the test samples were prepared by being coated with cataphoresis, while some others were produced with primer painting along with the ones that do not have any coating or painting on them. Following this procedure, single lap type joints with different adhesive thicknesses were manufactured and subjected to fatigue tests. To make a comparison of their fatigue endurances, spot welded joints, as an alternative bonding method, were also subjected to the fatigue test. It was clearly observed that the spot welding joints have surpassed their adhesive counterparts in fatigue performance, and the samples coated with cataphoresis have outperformed among the adhesion type bonds.

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“…Furthermore, the two-sheet spot-welded joint has been simulated considering different stainless steels 304 and 316. 17 In another study, Ertas and Akbulut 18 have studied the effect of electrode force on the fatigue behavior of tensile-shear testing (TST) specimens. It was found that by optimizing the amount of electrode force, the fatigue lives of the specimens can be enhanced up to 50%.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life analysis in the residual stress field due to resistance spot welding process considering different sheet thicknesses and dissimilar electrode geometries

Kashyzadeh

Farrahi

Ahmadi

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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A typical vehicle body contains many 3-sheet spot-welded connections with different sheet thicknesses. In addition, the use of dissimilar electrode geometries is extremely common in the automotive industry. These two factors lead to an asymmetric spot weld with asymmetric residual stress distribution and heat-affected zone. This asymmetry has considerable effects on the fatigue behavior of these joints. Although many previous studies were dedicated to the analysis of spot welds, consideration of different electrode geometries and fatigue analysis of 3-sheet spot-welded joints are absent in the literature. To this end, in the present paper, the resistance spot weld process of three-sheet low carbon steels considering different sheet thicknesses and dissimilar electrode geometries (F0 and D0) was simulated. The finite element simulation presented, was verified by comparison to the experimental results for the nugget size and residual stress. Residual stress distribution diagrams were obtained with respect to the distance from the center of the nugget in four different paths. Eventually, fatigue life analysis of this type of joint was performed using the finite element method. The results indicate that the finite element-based fatigue results are within the scatter band of the experimental results (75/75 tolerance limits), and consequently, the provided algorithm can be reliably used to analyze the fatigue behavior of spot-welded connections with complex specifications.

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Experimental study on fatigue performance of resistance spot-welded sheet metals

Cited by 13 publications

References 30 publications

Comparative Study of Classification Algorithms for Quality Assessment of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs

Comparative Study of Classification Algorithms for Quality Assessment of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs

Effects of single-lap joint at different adhesive thicknesses on fatigue strength of metals with different surface coatings

Fatigue life analysis in the residual stress field due to resistance spot welding process considering different sheet thicknesses and dissimilar electrode geometries

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