Resistance Spot Welding Characteristics and Mechanical Properties of Galvannealed HSLA 350 Steel

Khan, M. Shehryar; Bhole, S.D.; Chen, D.L.; Boudreau, G.; Biro, E.; Deventer, Johanna van

doi:10.1179/cmq.2009.48.3.303

Cited by 18 publications

(5 citation statements)

References 6 publications

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“…Therefore, welding parameters, namely welding current, welding time and electrode force, which determine weld heat input, should be adjusted so that the sufficient weld size is obtained. In many studies, the effects of process parameters including welding current, welding time, electrode force, holding time and electrode geometry on the physical weld attributes were studied for a given steel BM using both experimental [187][188][189][190][191][192][193][194][195][196][197][198] and numerical techniques. [199][200][201] It is interesting to note that electrode degradation can affect the weld nugget growth, which in turn influences the failure mode transition.…”

Section: Adjusting Welding Parametersmentioning

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: Adjusting Welding Parametersmentioning

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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“…The hold time and the electrode force are important factors which can help to reduce the shrinkage voids. 12,[18][19][20]…”

Section: Welding Imperfectionsmentioning

confidence: 99%

Welding behaviour, microstructure and mechanical properties of dissimilar resistance spot welds between galvannealed HSLA350 and DP600 steels

Khan

Bhole

Chen

et al. 2009

Science and Technology of Welding and Joining

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Resistance spot welding experiments were conducted on dissimilar material combination of HSLA350/DP600 steels. The welds were characterised using optical and scanning electron microscopy. The fusion zone of the dissimilar material spot weld was predominantly martensitic with some bainite. Mechanical properties were also determined by tensile shear, cross tension and fatigue tests. The performance of dissimilar material spot weld was different from that of the similar ones in each of the HSLA350 and DP600 steels and exhibited different heat affected zone hardness. The DP600 weld properties played a dominating role in the microstructure and tensile properties of the dissimilar material spot welds. However, the fatigue performance of the dissimilar welds was similar to that of the HSLA350 welds. Fatigue tests on the dissimilar material spot welds showed that the 5?5 mm diameter nugget exhibited higher fatigue strength than the 7?5 mm diameter nugget.

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“…In a similar study, Jonardhan et al [38], stated that hardness values increased as they moved from the base metal towards the fusion zone, and that this was due to the presence of martensite and different zones formed in HAZ. Khan et al [39] also found that hardness increased from the base metal towards the fusion zone, and attributed this to the chemical composition of the steels and the rapid cooling process.…”

Section: Hardness Testmentioning

confidence: 95%

Regional Pre-Heat Treatment System Development and Applications for HAZ in RSW Joining of High-Strength Steels

Aydın

HIDIROĞLU²,

Kahraman³

2023

Preprint

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STRENX and DP steels are advanced high-strength dual-phase steel types used in the automotive industry for producing lightweight vehicles that have low cost, high fuel efficiency, and can carry more load volume. In this study, STRENX 700 CR and DP 800 steels were joined by resistance spot welding (RSW) using medium frequency direct current (MFDC). Some parts were joined under atmospheric conditions, while others were joined by applying regional pre-heating (RPH) to their heat-affected zones (HAZ) before welding. The design, manufacturing, and adaptation of the RPH system to the RSW machine were carried out as part of this study, considering it as a new system. After the joining process, non-destructive (visual inspection, magnetic particle) and destructive (microhardness, tensile-shear, cross-tension, fatigue) tests were performed on RSW connections between STRENX 700 CR and DP 800 steels. Hardness tests revealed that the RPH applied to the HAZ before welding reduced the hardness of the weld metal by approximately 8%, while the microstructure analysis showed that the RPH increased both the weld metal and the HAZ width. The tensile-shear strength increased by about 7%, and the cross-tension test strength increased by about 5% with the RPH applied to the HAZ before welding. In both the tensile-shear and cross-tension tests, all failures occurred in the form of button shearing from the HAZ. The RPH treated specimens showed the highest fatigue life, with an average of 947,632 cycles.

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Resistance Spot Welding Characteristics and Mechanical Properties of Galvannealed HSLA 350 Steel

Cited by 18 publications

References 6 publications

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

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

Welding behaviour, microstructure and mechanical properties of dissimilar resistance spot welds between galvannealed HSLA350 and DP600 steels

Regional Pre-Heat Treatment System Development and Applications for HAZ in RSW Joining of High-Strength Steels

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