Fatigue behaviour of laser spot welds in dual phase 780 steel

Ray, Trishita; Kundu, Janardan; Kundu, Atanu; Shome, Mahadev

doi:10.1016/j.ijfatigue.2019.105374

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The value is lower than expected because it is a thicker material, observing that the author did not plot the S-N Curve. Trishita Ray studied DP780 steel with laser spot welds that were 1.0 mm thick and the results of the welds tested found mean values of 48.39% [2]. The values found were above 33% (one third of the specimen with 03 spot welds), but a different welding process was used.…”

Section: Fatigue Propertiesmentioning

confidence: 99%

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High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

Fabiano Ferreira Silva,

Hermano Nascimento Junior,

Roberto Rossy Chaves

et al. 2023

Global J. Eng. Technol. Adv.

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In this study, a methodology was successfully developed and validated to evaluate the behavior of spot welded joints of DP780, TRIP780 and DC04 steels in high cycle fatigue. Test specimens were made with three spot welds and Wohler curves were developed using the uniaxial tensile/traction load adopting the Owen R90C90 method. The spot welds showed an increase in fatigue life and a reduction in the maximum load, similar to steels. The influence of mechanical strength and material thickness tested and the types of fractures that occurred were compared. In low cycle regions, spot welds showed greater dispersion at maximum loading, between the different materials, and in higher cycle regions, this dispersion was reduced. The results obtained by adopting this method using three spot welds showed greater repeatability and less variation between the specimens of the same material. This developed method can be used with increased reliability to develop automotive bodies and spot welded components.

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Section: Fatigue Propertiesmentioning

confidence: 99%

“…Several authors have researched spot welds and the combined effect of parameters such as material property and thickness, weld and notch geometry, fusion zone, microstructure and the loading condition on fatigue behavior [2].…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

Fabiano Ferreira Silva,

Hermano Nascimento Junior,

Roberto Rossy Chaves

et al. 2023

Global J. Eng. Technol. Adv.

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show abstract

“…They pointed out that this is closely related to the fine multi-directional grains in the laser weld and the particle phase precipitation in the mixed weld. Trishita Ray [17] explained the failure mechanism under fatigue load using a stress analysis model and experimental data. Through discontinuous fatigue tests, it was found that small welds show a slightly longer fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Analysis and Fatigue Behavior of Laser Beam Welding 2060-T8/2099-T83 Aluminum–Lithium Alloys

et al. 2021

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In this paper, the microstructure analysis and performance research of dual laser beam welded 2060-T8/2099-T83 aluminum–lithium alloys were carried out. First, the macroscopic morphology and microstructure characteristics of T-joint aluminum–lithium alloys under different welding conditions were observed. Then the effect of welding parameters and pore defects on tensile and fatigue properties of the weld were carried out and the experimental results were analyzed. It was found that the weld heat input has a significant influence on the penetration of the welded aluminum–lithium alloys joint. When the laser power is too high, the weld will absorb more laser energy and the increase in the evaporation of magnesium will further increase the weld penetration. When the penetration depth increases, the transverse tensile strength tends to decrease. There is no obvious rule for the effect of pore defects on the tensile strength of the weld. At the same time, the heat input of the weld is inversely proportional to the porosity. When the weld heat input increases from 19.41 to 23.33 kJ/m, the porosity decreases from 5.35% to 2.08%. During the fatigue test, it was confirmed that the existence of pore defects would reduce the fatigue life of the weld. In addition, from the analysis of the fatigue fracture morphology it can be found that when the porosity is low, the weld toe is the main source of fatigue cracks. The crack propagation zone shows a typical beach pattern and the final fracture of the base metal presents the characteristics of a brittle fracture. While, when the porosity is high, the crack source is mainly located at the pore defects. T-joint fractures from the inside of the weld and the fracture in the final fracture zone have obvious pore defects and dimples.

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Effect of weld seam orientation and welding process on fatigue fracture behaviors of HSLA steel weld joints

Kim

Hwang

2020

International Journal of Fatigue

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Fatigue behaviour of laser spot welds in dual phase 780 steel

Cited by 6 publications

References 24 publications

High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

Microstructure Analysis and Fatigue Behavior of Laser Beam Welding 2060-T8/2099-T83 Aluminum–Lithium Alloys

Effect of weld seam orientation and welding process on fatigue fracture behaviors of HSLA steel weld joints

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