Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Huin, Thibaut; Dancette, Sylvain; Fabrègue, Damien; Dupuy, Thomas

doi:10.3390/met6050111

Cited by 42 publications

(31 citation statements)

References 25 publications

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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%

“…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%

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Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels

Spena

Maddis

D’Antonio

et al. 2016

Metals

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Abstract:This work aims at investigating the spot weldability of a new advanced Quenching and Partitioning (Q&P) steel and a Transformation Induced Plasticity (TRIP) steel for automotive applications by evaluating the effects of the main welding parameters on the mechanical performance of their dissimilar spot welds. The welding current, the electrode tip voltage and the electrical resistance of sheet stack were monitored in order to detect any metal expulsion and to evaluate its severity, as well as to clarify its effect on spot strength. The joint strength was assessed by means of shear and cross tension tests. The corresponding fracture modes were determined through optical microscopy. The welding current is the main process parameter that affects the weld strength, followed by the clamping force and welding time. Metal expulsion can occur through a single large expulsion or multiple expulsions, whose effects on the shear and cross tension strength have been assessed. Longer welding times can limit the negative effect of an expulsion if it occurs in the first part of the joining process. The spot welds exhibit different fracture modes according to their strengths. Overall, a proper weldability window for the selected process parameters has been determined to obtain sound joints.

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Section: Shear and Cross Tension Testssupporting

confidence: 83%

Section: Spot Weld Fracturementioning

confidence: 99%

Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels

Spena

Maddis

D’Antonio

et al. 2016

Metals

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“…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%

Failure Mode Prediction of Resistance Spot Welded Quenching and Partitioning Steel

Luo

Zhang

2019

MATEC Web Conf.

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In recent years, a novel Advanced High-Strength Steels called quenching and partitioning (Q&P) steel has been applied in the automotive industry because its good combination of strength and ductility. In this study, an experimental setup by adopting digital image correlation (DIC) method was firstly developed to establish the constitutive relationship of fusion zone in the spot welds produced by Q&P980. Stress-strain relationship extracted from the tensile bar within the fusion zone and compared the results to that of base metal. The fusion zone of Q&P980 found to have a higher tensile strength and similar elongation compared with base metal. A numerical model established to predict the failure mode of joints generated by Q&P980 after obtaining the constitutive relationship of fusion zone. The predicted failure mode was in good coherence with the experimental results under the lap-shear test conditions. The developed FE model was proven efficient in tensile strength and failure mode characterization of spot welded specimen. This study could provide solutions to maintain or even improve vehicle crashworthiness of lightweight vehicle structures.

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“…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

Optimización del proceso RSW para acero DP 1000

et al. 2018

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RESUMEN En el último tiempo se han introducido nuevos materiales en la construcción de automóviles a fin de disminuir su peso y consecuentemente el consumo de combustible y el nivel de emisiones. Entre ellos se encuentran los Aceros Dual Phase (DP), constituidos por una matriz ferrítica con islas de martensita. La soldadura por puntos de resistencia (RSW) es el proceso de soldadura más utilizado en la industria automotriz. Sin embargo, la soldadura de estos materiales presenta mayores desafíos, ya que los parámetros empleados para la soldadura RSW de aceros convencionales no son aplicables a estos aceros avanzados. Asimismo, los ciclos térmicos de la soldadura degradan sus propiedades encontrándose el mínimo de dureza en la zona sub y/o inter crítica. A su vez, debido a las altas velocidades de enfriamiento impuestas por la fuerte refrigeración de los electrodos, en la zona de la lenteja se pueden generar estructuras de elevada dureza. En este sentido, la optimización de los procedimientos de soldadura presenta un interés especial. Por otro lado, la productividad es un aspecto de gran relevancia en estas aplicaciones por lo que la reducción de los tiempos de soldadura es un requerimiento. El objetivo de este trabajo es evaluar el efecto de los parámetros de soldadura RSW en aceros DP1000 de forma de optimizar el mismo. A este fin, se soldaron mediante RSW probetas de acero DP1000 de 1,2 mm de espesor, variando la corriente y el tiempo de soldadura. Sobre las uniones soldadas se realizó la caracterización macro y microestructural mediante microscopía óptica y electrónica de barrido, perfiles de microdureza Vickers y ensayos de arrancamiento tipo peel-test y shear-test. Las superficies de fractura se analizaron mediante microscopía óptica. Se obtuvo un conjunto de parámetros que optimiza el procedimiento de soldadura de aceros DP1000 mediante RSW. Se encontró que a partir de los 10 ciclos de soldadura y con niveles de corriente de 7 KA los puntos cumplen con los requerimientos dimensionales y de propiedades mecánicas adoptados por la industria automotriz.

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Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Cited by 42 publications

References 25 publications

Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels

Weldability and Monitoring of Resistance Spot Welding of Q&P and TRIP Steels

Failure Mode Prediction of Resistance Spot Welded Quenching and Partitioning Steel

Optimización del proceso RSW para acero DP 1000

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