Effect of Zn-coating type on intergranular Cu-penetration in steels during weld-brazing

Khan, M. Shehryar; DiGiovanni, Chris; Ghatei-Kalashami, A.; Sarmast-Ghahfarokhi, Shadab; Song, Gang; Goodwin, Frank; Zhou, Y.

doi:10.1016/j.matlet.2023.134442

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…In addition to Al-Si coatings, which are widely utilized for the protection of hot-stamped steels, alternative coatings like Zn-based galvanized (GI) and galvannealed (GA) coatings are employed to safeguard advanced high-strength steels (AHSSs). However, these alternative coatings come with their own challenges, such as the risk of liquid metal embrittlement (LME) which can impact mechanical properties of the joint [38,52,[67][68][69]. Some experiments have also been conducted on zinc-nickel alloy and hybrid coatings for PHS applications.…”

Section: Coating Technologiesmentioning

confidence: 99%

Recent advances in mitigating fusion zone softening during laser welding of Al-Si coated 22MnB5 press-hardened steels

Khan¹

2023

Mater. Res. Express

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The automotive industry is seeking reduced vehicle weight and improved safety of newer generation vehicles to meet global zero-emission targets. Tailor-welded blanks (TWBs) offer a solution to meet this demand by producing lightweight yet strong components, such as the B-pillar, using laser-welded press-hardened steels. The laser welding of Al-Si coated PHSs causes the coating to be diluted into the melt pool which can cause premature failure due to the presence of a softer ferrite phase in an otherwise martensitic joint. Currently, laser ablation is used to remove the Al-Si layer prior to welding, but other techniques have been proposed which can potentially bypass the need to remove the coating and instead, welding directly through the coating. This study examines the problem of fusion zone (FZ) softening during the laser welding of Al-Si coated 22MnB5 and discusses recently proposed novel solutions that can solve the issue without the prior removal of the Al-Si coating before welding or using expensive filler materials during welding. The paper concludes with several viable recommendations for future work that can be used as potential directions for further research.

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