Effect of heat input on HAZ softening in fiber laser welding of 22MnB5 steel

Tunçel, Oğuz; Aydın, Hakan; Davut, Kemal

doi:10.1016/j.optlastec.2023.109560

Cited by 10 publications

(1 citation statement)

References 32 publications

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“…Bright-field TEM images have been used to elucidate the microstructure of the FZ in both as-received welded (ARW) and as-received welded then hot-stamped (ARWHS) conditions, showing a mixture of hightemperature δ-ferrite and martensite in the ARW condition, and low-temperature α-ferrite and martensite in the ARWHS condition [17]. It is important to note that if the steel is welded after hot-stamping, it can lead to the formation of a heat-affected zone (HAZ) that can negatively affect the mechanical properties of the joint [72]. Generally speaking, press-hardened steels are always laser welded first and then hot-stamped to avoid HAZ softening related issues in TWBs.…”

Section: Microstructure Of Laser-welded Al-si Coated 22mnb5mentioning

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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Section: Microstructure Of Laser-welded Al-si Coated 22mnb5mentioning

confidence: 99%