2016
DOI: 10.3390/met6050111
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Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Abstract: Nowadays, environmental regulation encourages carmakers to reduce the global vehicle weight. Steelmakers develop grades with high performance (Advanced High Strength Steels, AHSS) and fine steel sheet assemblies are used in car body structures, with an optimized thickness in each part. However, unusual fracture modes are sometimes observed during the mechanical tests of heterogeneous AHSS welds, made of dissimilar steel grades and sheet thicknesses. Weld fractures can occur with a strength lower than expected.… Show more

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Cited by 42 publications
(31 citation statements)
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“…7-9) exhibit similar cross tension strengths to those of the samples welded with lower currents. These results are coherent with those of a previous work by Huin et al about the dissimilar welding of DP and hot stamping boron steels [21].…”
Section: Shear and Cross Tension Testssupporting
confidence: 83%
See 1 more Smart Citation
“…7-9) exhibit similar cross tension strengths to those of the samples welded with lower currents. These results are coherent with those of a previous work by Huin et al about the dissimilar welding of DP and hot stamping boron steels [21].…”
Section: Shear and Cross Tension Testssupporting
confidence: 83%
“…The transition between the two types of button pull failures is attributable to the nugget size and to the angle between the faying surface and the border of the nugget close to the notch tip. The lower the angle, the greater the tendency of a fracture to spread along the nugget border [21]. Moreover, the presence of metal splashes at the notch tip, referring to the left-hand notch tip in Figure 7f, could promote crack propagation in the HAZ regions, but not along the nugget border.…”
Section: Spot Weld Fracturementioning
confidence: 99%
“…Similar to conventional AHSS, Q&P steel should be weldability and be able to obtain favourable failure mode of spot welds. FEA model was an efficient method to make investigation on the failure mode and fracture mechanism of spot welds [3][4].Recently, numerous FEA models had been developed to predict and understand the failure mode in various loading conditions, such as tension condition, tensile shear condition and the combination [5][6][7]. For the tensile shear condition of AHSS, the influence of HAZ softening effect and stress intensity on failure modes were taken into consideration in FEA model [8,9].…”
Section: Introductionmentioning
confidence: 99%
“…Numerosos autores los utilizan directamente para expresar la resistencia de la soldadura por puntos. De acuerdo con las normas industriales, el tamaño mínimo de las soldaduras por puntos para garantizar la fractura extraíble sigue la relación D = K√t, donde D es el diámetro de la lenteja de soldadura en mm, K es una constante dependiente del proceso que va de 3 a 6, y t es el espesor mínimo de la chapa en mm [10,11].…”
Section: Introductionunclassified