Influence of Joint Configuration on the Strength of Laser Welded Presshardened Steel

Kügler, H.; Mittelstädt, Christoph; Vollertsen, Frank

doi:10.1016/j.phpro.2016.08.039

Cited by 9 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the smaller intersection line of the AlSicoated surface and the weld seam, the amount of Aluminum is small enough to avoid inclusions of a critical size. This improved the performance of the welds [129].…”

Section: Welding Of Press-hardened Steelmentioning

confidence: 92%

“…The third method to avoid both the reduction of strength and the additional processing step is to produce multiple parallel small welds, which add to an appropriate joint area and high joint strength [129]. Due to the smaller intersection line of the AlSicoated surface and the weld seam, the amount of Aluminum is small enough to avoid inclusions of a critical size.…”

Section: Welding Of Press-hardened Steelmentioning

confidence: 99%

See 1 more Smart Citation

Advances in macro-scale laser processing

Schmidt

Zäh

et al. 2018

CIRP Annals

View full text Add to dashboard Cite

Section: Welding Of Press-hardened Steelmentioning

confidence: 92%

Section: Welding Of Press-hardened Steelmentioning

confidence: 99%

Advances in macro-scale laser processing

Schmidt

Zäh

et al. 2018

CIRP Annals

View full text Add to dashboard Cite

“…To achieve maximum effect, the single paths have to be welded with a very small laser spot. This way, only a small quantity of coating is molten by each path and less precipitation can be found at the fusion line [16].…”

Section: Motivationmentioning

confidence: 99%

Modified laser beam welding of aluminum‐silicon coated 22MnB5

Gerhards

Engels

Olschok

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Press hardened 22MnB5 is an excellent structural material, but there are several issues when it comes to welding. Especially in the case of overlap joint laser welding, the most severe issue is precipitation of the aluminium silicon (AlSi) coating at the fusion line. If the coating remains on the sheets, an ultimate strength of 20 kN with a crack initiation at the fusion line is reached in tensile tests instead of 30 kN with a crack initiation in the heat affected zone (HAZ) when the coating is removed prior to welding. In the presented work, the influence of coating on the material properties as well as the structure of the precipitation at the fusion line are examined and discussed. It is stated that the precipitation does not consist of AlxFey intermetallic phases, but of an iron, aluminium and silicon solid solution. The fractured surfaces of tensile tests show brittle behavior for the precipitation and ductile behavior for areas where the crack propagated through the steel. A modified beam oscillation in the shape of a recumbent “8” in welding direction is introduced. It was possible to increase the ultimate strength by 10 kN and nearly double the possible elongation.

show abstract

“…However, the steel sheets are usually coated with Al-Si to prevent surface oxidation during the austenitization preceding the forming [4]. If the coating is not removed before welding, it can have a negative effect on the strength of the weld metal [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding

ŠEBESTOVÁ,

HORNÍK,

MIKA

et al. 2023

METAL Conference Proeedings

View full text Add to dashboard Cite

Weld microstructure depends on the characteristics of welded materials and parameters of welding technology, especially on the heat input that determines the peak temperature and the cooling rate. When the coated sheets are welded, the effect of the chemical composition of the coating must be also considered even though its thickness is only a few tens of microns. During 22MnB5+AlSi laser welding experiments, the ferritestabilizing elements of coating modified the weld metal microstructure. Ferrite appeared in a quenched weld metal. The rapid cooling rate accompanying welding with a focused beam limited the homogenization of the weld metal which resulted in the formation of ferritic bands in the regions rich in Si and especially in Al. On the other hand, a high level of homogenization was reached when welding with the defocused beam. The ferritic islands uniformly distributed in the weld metal were formed at 0.4 wt% and 1.6 wt% of Si and Al, respectively. The doubled heat input reduced the Al content to 0.7 wt% insufficient for the ferrite formation at still relatively high cooling rates. Predicting the distribution of ferrite in the weld metal is challenging due to its dependence on various factors, such as cooling rate and the volume of dissolved coating, which may vary with any modifications made to the welding parameters.

show abstract

Influence of Joint Configuration on the Strength of Laser Welded Presshardened Steel

Cited by 9 publications

References 10 publications

Advances in macro-scale laser processing

Advances in macro-scale laser processing

Modified laser beam welding of aluminum‐silicon coated 22MnB5

Microstructure modifications of Al-Si-coated press-hardened steel 22MnB5 by laser welding

Contact Info

Product

Resources

About