Microstructure and fracture characteristics of spot-welded DP600 steel

Ma, Chao; Chen, D.L.; Bhole, S.D.; Boudreau, G.; Lee, A.; Biro, E.

doi:10.1016/j.msea.2007.08.010

Cited by 190 publications

(130 citation statements)

References 7 publications

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“…Zhang et al [19] reported that the failure mode primarily depends on the fusion zone size and failure tends to occur under pull-out mode as fusion zone size increases. Ma et al [20] reported about the formation of shrinkage voids in fusion zone of spot-welded DP600 steel. According to them, these voids are formed due to rich chemistry of DP steels as compared to low carbon steels.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Ramazani

Mukherjee

Abdurakhmanov

et al. 2015

Metals

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Abstract:Resistance spot welding (RSW) as a predominant welding technique used for joining steels in automotive applications needs to be studied carefully in order to improve the mechanical properties of the spot welds. The objectives of the present work are to characterize the resistance spot weldment of DP600 sheet steels. The mechanical properties of the welded joints were evaluated using tensile-shear and cross-tensile tests. The time-temperature evolution during the welding cycle was measured. The microstructures observed in different sites of the welds were correlated to thermal history recorded by thermocouples in the corresponding areas. It was found that cracks initiated in the periphery region of weld nuggets with a martensitic microstructure and a pull-out failure mode was observed. It was also concluded that tempering during RSW was the main reason for hardness decrease in HAZ. OPEN ACCESSMetals 2015, 5 1705

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Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Ramazani

Mukherjee

Abdurakhmanov

et al. 2015

Metals

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“…Hardness of martensitic structure occurred in welding zone can be written as follows depending on carbon ratio in alloy (Ma et al, 2008); An experimental study on fracture toughness of resistance spot welded galvanized • 9…”

Section: Discussionmentioning

confidence: 99%

An experimental study on fracture toughness of resistance spot welded galvanized and ungalvanized DP 450 steel sheets used in automotive body

Sevim

2016

REVMETAL

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ABSTRACT:The purpose of this study is to determine fracture toughness of Resistance Spot Welded (RSW) Dual Phase (DP) steels. RSW of galvanized and ungalvanized DP 450 steel sheets was carried out on spot welding machine. Fracture toughness of RSW joints of galvanized and ungalvanized DP 450 steel sheets was calculated from tensile-shear tests. New empirical equations were developed using Least Squares Method (LSM) between energy release rate, fracture toughness and critical crack size depending on the relationship between hardness and fracture toughness values. Results indicated that fracture toughness of joints welded by using RSW increased exponentially while the hardness decreased. In addition, fracture toughness and energy release rate of RSW galvanized DP 450 steel sheets were lower compared to RSW ungalvanized DP 450 steel sheets which had approximately the same hardness. RESUMEN:Estudio experimental sobre la resistencia a la fractura de los aceros de resistencia soldada por puntos DP 450, láminas de acero galvanizado y sin galvanizar utilizados en la estructura del automóvil. El objetivo de este estudio es determinar la tenacidad de fractura de los aceros dual (DP) soldados por puntos de resistencia (RSW). En la máquina de soldadura por puntos se realizó la soldadura de láminas de acero DP 450 galvanizado y sin galvanizar. A partir de los ensayos de tracción-cizallamiento, se calculó la tenacidad a la fractura de las uniones del acero DP 450 galvanizado y sin galvanizar. Aplicando el método de mínimos cuadrados (LSM) se desarrollaron nuevas ecuaciones empíricas entre el porcentaje de energía liberada, la tenacidad de fractura y el tamaño de grieta crítica en función de la relación entre los valores de tenacidad de fractura y de dureza. Los resultados indicaron que la tenacidad de fractura de las uniones soldadas por RSW aumentó exponencialmente, mientras que la dureza disminuyó. Además, el porcentaje de energía liberada de las láminas de acero DP 450 galvanizadas y soldadas fueron menores que en el caso de las láminas sin galvanizar a valores iguales de dureza.PALABRAS CLAVE: Aceros dual (DP); Fatiga; Resistencia soldada por puntos (RSW); Tenacidad a la fractura

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“…El perfil de microdureza tiene el aspecto típico para la soldadura RSW de aceros DP [21,22,23]. Los máximos registros de microdureza se encontraron en la zona de fusión (ZF).…”

Section: Análisis De Las Soldaduras Por Resistenciaunclassified

Soldadura de aceros dual phase en chapa fina: GMAW, PAW y RSW

2011

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ResumenLos aceros Dual Phase (DP) han encontrado recientemente una fuerte aplicación en elementos estructurales en la industria automotriz, debido a la necesidad de disminuir peso. La soldadura de estos materiales cobra particular importancia considerando su aplicación estructural y los procesos relacionados en su fabricación. En particular la soldadura de resistencia por punto (RSW) y semiautomática con alambre macizo y protección gaseosa (GMAW) RSW, GMAW and PAW. In Palabras clave: aceros Dual Phase, PAW, GMAW, RSW, ZAC Abstract: Dual Phase steels (DP) have been used recently as an interesting option for structural elements, specialy in automotive industry, due to weight reduce requirements. Welding of these materials becomes particularly important considering their application as structural elements and the related manufacturing methods. In particular resistance spot welding (RSW) and gas metal arc welding (GMAW) are widely used in the automotive manufacturing. The plasma arc welding (PAW) has the charateristic, within arc welding processes, to involve the highest energy density, being this parameter interesting to certain applications on automative industry (tailor welded blanks). The objective of this work is to study the microstructural evolution and properties of welded DP steels by mean of

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Microstructure and fracture characteristics of spot-welded DP600 steel

Cited by 190 publications

References 7 publications

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

An experimental study on fracture toughness of resistance spot welded galvanized and ungalvanized DP 450 steel sheets used in automotive body

Soldadura de aceros dual phase en chapa fina: GMAW, PAW y RSW

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