Mechanical and fatigue behaviour of laser and resistance spot welds in advanced high strength steels

Daneshpour, S.; Riekehr, Stefan; Koçak, M.; Gerritsen, Christoph

doi:10.1179/136217108x336298

Cited by 49 publications

(32 citation statements)

References 9 publications

(8 reference statements)

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“…9a, the weld region in LSW has been surrounded by a compressive region which is larger in magnitude than that of the RSW. Our previous studies on failure analysis of laser spot welds under static and cyclic loading [13,21] reveal that the entire region of the weld ring has higher strength (overmatching) than the base material. This fact indicates the presence of the shielding effect of strength overmatching on the weld region where the tensile residual stress exists (see Fig.…”

Section: Residual Stress and Cooling Rate Analysesmentioning

confidence: 99%

“…The ''Ring weld" geometry of LSW and the nugget type of RSW were taken from our prior work [13], and would be used as the basis for comparison with other geometries. The start point of laser welds is often prone to failure due to low penetration and high cooling rate while the end point is often prone to failure due to impurities pileup as a result of keyhole collapse.…”

Section: Welding Path Geometriesmentioning

confidence: 99%

“…Previous work [13] has compared the fatigue behaviour of resistance spot welds and laser spot welds of dissimilar materials, including advanced high-strength steels (AHSS), while others have analysed different types of butt-welded specimens on a microstructural level [14]. Thermo-mechanical analysis of laser spot welding can provide useful information to improve the understanding of the cyclic behaviour of welded structures, and this information can lead to better damage-tolerant design of these structures.…”

Section: Introductionmentioning

confidence: 99%

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Residual stress analysis of laser spot welding of steel sheets

et al. 2009

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a b s t r a c tExperimental and numerical studies were conducted to characterize laser and resistance spot welds to gain an understanding of load carrying capacity, temperature distributions and residual stress states of different joint geometries used in the automotive industry. Different laser spot weld path geometries are compared with conventional resistance spot welds to find the residual stress distributions in each. It was found out that the weld region in laser spot welding is surrounded by a compressive region which has higher compressive stress values and larger size than that of resistance spot welds. Simulations showed good agreement with experimental temperature distributions, and were able to qualitatively predict the residual stress distributions in each of the weld geometries. The thermal history at known failure locations within the welds and the influence of the weld geometries on cooling rate are also discussed.

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Section: Residual Stress and Cooling Rate Analysesmentioning

confidence: 99%

Section: Welding Path Geometriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Residual stress analysis of laser spot welding of steel sheets

et al. 2009

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“…Stainless steel sheet is widely used in the welded structure of biopharmaceutical, medical device, aerospace, and precision instrument manufacturing industry because of its characteristic of smooth surface, nonmagnetic performance, and corrosion resistance [1]. Currently, the common welding methods are MIG-MAG, TIG, and laser welding [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…However, the study of the welding temperature field is a prerequisite for the analysis of welding stress and deformation [1]. It is very important to measure accurately the welding temperature field.…”

Section: Introductionmentioning

confidence: 99%

Research on Heat Source Model and Weld Profile for Fiber Laser Welding of A304 Stainless Steel Thin Sheet

Fan

Zhang³

et al. 2018

Advances in Materials Science and Engineering

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A heat source model is the key issue for laser welding simulation. e Gaussian heat source model is not suitable to match the actual laser weld profile accurately. Furthermore, fiber lasers are widely recognized to result in good-quality laser beam output, a narrower weld zone, less distortion, and high process efficiency, compared with other types of lasers (such as CO 2 , Nd : YAG, and diode lasers). At present, there are few heat source models for fiber laser welding. Most of researchers evaluate the weld profile only by the bead width and depth of penetration, which is not suitable for the laser keyhole welding nail-like profile. is paper reports an experimental study and FEA simulation of fiber laser butt welding on 1 mm thick A304 stainless steel. A new heat source model (cylindrical and cylindrical) is established to match the actual weld profile using Marc and Fortran software. Four bead geometry parameters (penetration depth, bead width, waist width, and depth of the waist) are used to compare between the experimental and simulation results. e results show that the heat source model of cylindrical and cylindrical can match the actual shape of the fiber laser welding feasibly. e error range of the penetration depth, bead width, waist width, and depth of the waist between experimental and simulation results is about 4.1 ± 1.6%, 2.9 ± 2.0%, 13.6 ± 7.4/%, and 18.3 ± 8.0%, respectively. In addition, it is found that the depth of penetration is more sensitive to laser power rather than bead width, waist width, and depth of the waist. Welding speed has a similar influence on the depth of penetration, weld width, waist width, and depth of the waist.

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Combined corrosion and fatigue performance of joined materials for automotive applications

Vucko

LeBozec

Thierry

et al. 2016

Materials and Corrosion

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The aim of this study is to evaluate fatigue performance of joined assemblies (spot weld and/or adhesive bonding) in corrosive environment. Various assemblies have been tested in alternated and simultaneous fatigue‐corrosion modes. Adhesive joints are strongly affected by simultaneous fatigue‐corrosion with a large drop of the fatigue life compared to results in air. By alternating fatigue and corrosion, the reduction of fatigue life is important. For spot welding, fatigue life is decreased at higher load amplitudes and increased at lower amplitudes. These results are strongly linked to the opening of the gap near the spot weld at high load amplitudes. At low amplitudes, corrosion might limit the local stress at the notch root of the weld.

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Mechanical and fatigue behaviour of laser and resistance spot welds in advanced high strength steels

Cited by 49 publications

References 9 publications

Residual stress analysis of laser spot welding of steel sheets

Residual stress analysis of laser spot welding of steel sheets

Research on Heat Source Model and Weld Profile for Fiber Laser Welding of A304 Stainless Steel Thin Sheet

Combined corrosion and fatigue performance of joined materials for automotive applications

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