Residual stresses in resistance spot welded steel joints

Khanna, Sanjeev K.; Long, Xinping

doi:10.1179/174329308x283884

Cited by 28 publications

(9 citation statements)

References 44 publications

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“…The main method used to join sheet metals in the automotive industry is resistance spot welding (RSW), which is characterised by the low costs, high reliability, high operating speeds and suitability for automation [1,2]. The carefully designed multi-phase microstructures of the parent material are destroyed in and around the weld by the thermal-mechanical cycle imposed during RSW, with the resulting weld microstructures becoming chemically and mechanically heterogeneous.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of double pulse resistance spot welded advanced high strength steel

Eftekharimilani

Hermans

et al. 2017

Science and Technology of Welding and Joining

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The effects of single and double pulse resistance spot welding on the microstructures of an advanced high strength automotive steel are presented in this work. The double pulse welding schemes partially remelt the primary weld nugget and anneal the area at the fusion boundary of the nugget. The effects of the annealing treatment on the segregation and the microstructure have been studied by electron probe microanalysis (EPMA) in combination with electron backscatter diffraction (EBSD). Results show that phosphorus has been redistributed at the primary weld nugget edge of the double pulse welds, while the mean block width and ellipticity of the prior austenite grains were smaller in welds subjected to double pulsing compared with single pulse weld. A favourable failure mode was obtained for the double pulse welds although behaviour did not correlate with the measured grain size.

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Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of double pulse resistance spot welded advanced high strength steel

Eftekharimilani

Hermans

et al. 2017

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

show abstract

“…Resistance spot welding (RSW) is by far the most widely used joining method in the automotive industry due to the high operating speeds, low costs, the reliability of the process and the suitability for automation [2][3][4]. However, the thermal-mechanical cycle during resistance spot welding destroys the carefully designed multi-phase microstructure.…”

Section: Introductionmentioning

confidence: 99%

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

Eftekharimilani

Hermans

et al. 2017

Weld World

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This paper presents the effects of double pulse resistance spot welding (RSW) on the microstructural evolution, elemental distribution and mechanical properties of a 3 rd generation 1 GPa advanced high strength steel (AHSS). In order to investigate the effect of double pulsing, the steel was exposed to single and various double pulse RSW schedules. The first current pulse was applied to create the weld nugget, while the second current pulse generated a secondary weld nugget and annealed or (partial) re-melted the primary weld nugget, depending on the magnitude of the current. The effect of the second current pulse on the weld nugget and heat-affected zone characteristics was investigated using optical microscopy and electron probe microanalysis (EPMA). Optical and electron microscopy revealed that the secondary weld nugget is fully martensitic, showing a typical solidification microstructure, while the annealed zone reveals an equi-axed martensitic structure. EPMA results showed that elemental segregation has been considerably reduced in the annealed zone. Mechanical properties of the welds show that the AHSS studied is prone to weld metal failure for single pulse RSW. However, the double pulse RSW method can lead to significantly improved mechanical performance and favourable failure modes.

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“…Typically, a car body contains thousands of spot welds, whose mechanical strength and performance significantly affect the safety and reliability of the automobile structure. 4) Therefore, the investigation on how to improve the mechanical properties of the spot welds is necessary for the safe integration into the automotive architecture. Recent publications reported that the relationship among the welding process parameters, microstructures and welding properties of the spot welded DP steels.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Microstructures and Mechanical Properties of Resistance Spot Welded DP600 Steel by Double Pulse Technology

et al. 2011

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The effects of the second pulse in resistance spot welding (RSW) on the mechanical properties of dual phase (DP600) steel were investigated. The experimental results show that the addition of the second pulse can give rise to the formation of acicular ferrite, retained austenite and chromium carbides, which can markedly improve the cross-tensile strength (CTS) comparing to that treated by the single pulse technology. Meanwhile, the formation mechanism of acicular ferrite, bearing the cubic to cubic orientation relationship with respect to the surrounding martensite lath, was revealed by the analysis of the thermal history of DP600 steel under different RSW processes. The effect of microstructure on the fracture behavior was also discussed.

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Residual stresses in resistance spot welded steel joints

Cited by 28 publications

References 44 publications

Microstructural characterisation of double pulse resistance spot welded advanced high strength steel

Microstructural characterisation of double pulse resistance spot welded advanced high strength steel

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

Improvement of Microstructures and Mechanical Properties of Resistance Spot Welded DP600 Steel by Double Pulse Technology

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