Tensile-shear fracture behaviour of resistance spot-welded hot stamping sheet steel with Al–Si coating

Tan, Na; Hong, Jiyao; Lei, Ming; Jin, Xinyan; Zheng, Hongxing; Luo, Zhiping

doi:10.1080/13621718.2020.1751404

Cited by 7 publications

(2 citation statements)

References 37 publications

(46 reference statements)

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“…RSW is an effective welding process with high productivity owing to low cost and short process time. The coating layers affect resistance spot weldability of HPF steels [23][24][25][26][27][28]. In particular, AlSi-c HPF steels have a wide weldable current range due to their low contact resistance and a large current passage through the melting coating layer [23,29].…”

Section: Introductionmentioning

confidence: 99%

Improvement of resistance spot weldability of Al–Fe-alloy-coated HPF steel sheets

Yun

Gwon

et al. 2022

Science and Technology of Welding and Joining

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The resistance spot weldability of Al-Fe-alloy-coated (AlFe-c) HPF steels manufactured by heattreating Al-Si coated (AlSi-c) steel at 650°C for 10 h was investigated. Since AlFe-c steel had thick oxides in surface layer, the transition resistance was higher and weldability was poorer than the conventional AlSi-c steels. During spot welding of AlFe-c steels, expulsion occurred at low current, so the weld could not grow sufficiently. For this reason, AlFe-c steels had no weldable current range. To improve the weldability, pre-pulse current pattern was applied. By removing the oxides in the coating layer during the pre-pulse step, the resistance of the weld part was reduced, and the expulsion was delayed, so the weldable current range of AlFe-c steel was improved.

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Section: Introductionmentioning

confidence: 99%

Improvement of resistance spot weldability of Al–Fe-alloy-coated HPF steel sheets

Yun

Gwon

et al. 2022

Science and Technology of Welding and Joining

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“…Tan et al investigated the effect of Al-Si coating on the tensile shear fracture behavior of the RSW of press-hardened steel grade 22MnB5. They found that Fe-(Al,Si) on the edge of weld nuggets acted as a crack source and imitated the fracture [19]. However, these studies do not compare the tensile shear strength of welded joints between coated and uncoated steel in order to determine the effects of Al-Si coating on the tensile properties of hot-stamped steels.…”

Section: Introductionmentioning

confidence: 99%

Effects of Al-Si Coating on Static and Dynamic Strength of Spot-Welded Hot-Stamping Steel Joints

Afzal

Nielsen

2021

Metals

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Al-Si is the most popular coating used to prevent oxidation on the surfaces of hot-stamped steel sheets during the heating process. However, like other coatings, it affects the strength of the spot welds in joining the hot-stamped steel parts. In this study, the effects of Al-Si coating on the tensile strength of the resistance spot-welded joints in hot-stamped steel are discussed. Two types of 1.8 mm hot-stamped steel, in uncoated and Al-Si coated forms, were resistance spot-welded, and the tensile shear behavior of the welded joints was studied in both static and dynamic tests. To do this, a special fixture for impact tensile shear tests was designed and fabricated. In the case of the Al-Si coated steel, the presence of the molten Al-Si over the fusion zone, especially its aggregation in the edge of the weld nugget, caused a decrease in the maximum tensile load capacity and a failure of energy absorption in static and dynamic tests, respectively. Additionally, it increased the probability of changing its failure mode from pull out to interfacial fracture in the dynamic test. This study shows that the tensile strength behavior of the welded joints for the Al-Si coated hot-stamped steel is lower than the uncoated steel during static, and especially dynamic, force.

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A review of advances in resistance spot welding of automotive sheet steels: emerging methods to improve joint mechanical performance

Soomro

Pedapati

Awang

2021

Int J Adv Manuf Technol

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Tensile-shear fracture behaviour of resistance spot-welded hot stamping sheet steel with Al–Si coating

Cited by 7 publications

References 37 publications

Improvement of resistance spot weldability of Al–Fe-alloy-coated HPF steel sheets

Improvement of resistance spot weldability of Al–Fe-alloy-coated HPF steel sheets

Effects of Al-Si Coating on Static and Dynamic Strength of Spot-Welded Hot-Stamping Steel Joints

A review of advances in resistance spot welding of automotive sheet steels: emerging methods to improve joint mechanical performance

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