Modeling and Analysis of Microstructure Development in Resistance Spot Welds of High Strength Steels

Li, M. Victor; Dong, Ping; Kimchi, Menachem

doi:10.4271/982278

Cited by 10 publications

(10 citation statements)

References 1 publication

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“…Several finite element modellings have been developed to determine the thermal cycle during RSW. [80][81][82][83][84][85][86][87][88] A comprehensive review of weld thermal cycle simulation can be found elsewhere. 4 It was shown through modelling that spot welds in sheet thicknesses up to 2 mm, typically solidify in less than 3-4 cycles.…”

Section: Microstructure Evolution In Fz Of Resistance Spot Weldsmentioning

confidence: 99%

Critical review of automotive steels spot welding: process, structure and properties

Pouranvari

Marashi

2013

Science and Technology of Welding and Joining

423

375

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Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness-microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.

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Section: Microstructure Evolution In Fz Of Resistance Spot Weldsmentioning

confidence: 99%

Critical review of automotive steels spot welding: process, structure and properties

Pouranvari

Marashi

2013

Science and Technology of Welding and Joining

423

375

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“…It was shown through modelling that spot welds with thicknesses of up to 2 mm typically solidify in ,3-4 cycles. 13 Gould et al 14 developed a simple analytical model predicting the cooling rates of RSWs. According to this model, the cooling rate for 1?5 mm thickness is y4000 K s 21 .…”

Section: Microstructure and Hardness Profile Of Jointmentioning

confidence: 99%

Failure of resistance spot welds: tensile shear versus coach peel loading conditions

Pouranvari

Marashi

2012

Ironmaking & Steelmaking

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This paper aims at investigating the failure behaviour of resistance spot welds under tensile shear (TS) and coach peel (CP) loading conditions. A failure mechanism was proposed to describe both interfacial and pullout failure modes in each loading condition. The mechanisms were confirmed by SEM investigations, examining the cross-sections of the fractured welds to detail the fracture path. The experimental results showed that in the pullout failure mode during TS testing, necking is initiated at the nugget circumference in the base metal, and then failure propagates along the nugget circumference in the sheet, leading to the final fracture, while pullout failure during the CP test occurred by crack initiation and propagation near the weld nugget/heat affected zone boundary. The interfacial failure to pullout failure mode transition in the TS and CP tests was also studied. The critical weld nugget size required to ensure the pullout failure mode was obtained for each loading condition. The critical fusion zone size to ensure pullout failure mode during the TS test was larger than that of the CP test. It was found that the load bearing capacity of the spot welds under CP is significantly lower than that of the TS test.

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“…It has been shown through modelling that even at 500uC the cooling rates in spot welding were in excess of 1000uC s 21 . 16 5 Failure location of spot welds a without expulsion (electrode indentation is y8%) and b with expulsion (electrode indentation is y22%) Considering the higher hardness of weld nugget edge compared to that of the base metal, failure at the WN/ HAZ boundary accompanies with a higher resistance to necking which could lead to a higher load bearing capacity. Indeed, the interaction of these two factors (the reduction in sheet thickness due to the indentation and changing of the hardness of the failure location) determines the effect of increasing indentation on the peak load.…”

Section: Effect Of Porosity On Performance Of Spot Weldmentioning

confidence: 99%

Effect of expulsion on peak load and energy absorption of low carbon steel resistance spot welds

Pouranvari¹,

Abedi²,

Marashi³

et al. 2008

Science and Technology of Welding and Joining

104

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The effects of weld nugget size and expulsion on the performance of low carbon steel resistance spot weld have been investigated in the present paper. Failure mode, peak load and failure energy obtained in tensile-shear test have been used to describe the performance of spot weld. The influence of voids and porosity as well as electrode indentation associated with expulsion on peak load and failure energy is discussed. The results showed that although expulsion does not reduce the load carrying capacity of spot welds, it decreases their energy absorption capability which was attributed to the change of failure location due to excessive electrode indentation associated with expulsion.

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Modeling and Analysis of Microstructure Development in Resistance Spot Welds of High Strength Steels

Cited by 10 publications

References 1 publication

Critical review of automotive steels spot welding: process, structure and properties

Critical review of automotive steels spot welding: process, structure and properties

Failure of resistance spot welds: tensile shear versus coach peel loading conditions

Effect of expulsion on peak load and energy absorption of low carbon steel resistance spot welds

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