Optimal parameters for laser welding of advanced high-strength steels used in the automotive industry

Fernandes, Fábio A. O.; Oliveira, Danniel Ferreira de; Péreira, A.

doi:10.1016/j.promfg.2017.09.052

Cited by 32 publications

(24 citation statements)

References 9 publications

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“…However, improvement on the strength of the welds slightly compromised the ductility resulting in relatively lower elongations. In addition, it should be noted that the MIG-laser weld zone has excessive material brought in by the filler wire that may also contribute to the increase of strength [33]. Compared with BM samples, the stress in the laser-MIG hybrid welded joint samples reached the maximum value faster, and then the sample fractured with a relatively smaller strain, as shown in the enlarged upper-left corner figure in Fig.…”

Section: Tensile Strength and Fracture Morphologymentioning

confidence: 99%

Investigation of strengthening mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser-MIG hybrid welding processes

Zhang

Sun

et al. 2018

Int J Adv Manuf Technol

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In this study, in order to achieve a better understanding of the strengthening mechanism in the commercially pure (CP) Ti welds, autogenously laser beam and laser-MIG hybrid welding of 4.2 mm thick CP-Ti plates were performed and the correlation between microstructure, texture distribution and the mechanical properties were systematically investigated. Microstructural coarsening and increase in microhardness were observed in the HAZ and WZ. The tensile test results suggested the base metal was the weak point of the joint for both welding conditions. The EBSD observations confirmed that a large number of 1012 È É and 1122 È É twin grains occurred in the HAZ and WZ of both welded joints, while a higher concentration of these twin grains were found in the laser-MIG hybrid joints. High concentration of the twin grain boundaries can act as barrier to stop dislocation slip during deformation and therefore contribute to the strengthening of the welds. The existence of very small twin grains and acicular α phase in HAZ and WZ would equivalently reduce the averaged grain size and therefore induce an increase in strength based on Hall-Petch's law. In addition, the averaged Schmid factor of BM is higher than that of the WZ and HAZ in both welding joints suggesting that the grain boundary sliding will take place preferably in BM during deformation so that the necking and fracture occurred in base metal during tensile tests of both welding joint specimens.

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Section: Tensile Strength and Fracture Morphologymentioning

confidence: 99%

Investigation of strengthening mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser-MIG hybrid welding processes

Zhang

Sun

et al. 2018

Int J Adv Manuf Technol

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“…It has an average maximum power of 300 W and a peak pulse power of 12 kW. It has already been used to carry out other welding studies, from high-strength steels to dissimilar alloys [33,34], as well as to weld the two versions (white and black) of the material herein studied [28]. This machine makes it possible to set parameters such as the laser power, pulse duration, and frequency, percentage of overlapping between beams, and also their diameter.…”

Section: Laser Weldingmentioning

confidence: 99%

Laser Welding of Transmitting High-Performance Engineering Thermoplastics

et al. 2020

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Laser processing is a rapidly growing key technology driven by several advantages such as cost and performance. Laser welding presents numerous advantages in comparison with other welding technologies, providing high reliability and cost-effective solutions. Significant interest in this technology, combined with the increasing demand for high-strength lightweight structures has led to an increasing interest in joining high-performance engineering thermoplastics by employing laser technologies. Laser transmission welding is the base method usually employed to successfully join two polymers, a transmitting one through which the laser penetrates, and another one responsible for absorbing the laser radiation, resulting in heat and melting of the two components. In this work, the weldability of solely transmitting high-performance engineering thermoplastic is analyzed. ERTALON ® 6 SA, in its white version, is welded by a pulsed Nd:YAG laser. Tensile tests were performed in order to evaluate the quality of each joint by assessing its strength. A numerical model of the joint is also developed to support the theoretical approaches employed to justify the experimental observations.

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“…This observation was confirmed with the nano-hardness profile in the bead zone, Figure 11d. The result of the nano-hardness test was displayed in terms of [GPa], a procedure similar to the work of Fernandes et al [22] that studied the optimal parameters for laser-welding of Dual-Phase (DP600) AHSS. The hardness in the fusion zone is higher than in the base metal.…”

Section: Materials Microstructure and Micro-hardnessmentioning

confidence: 99%

The Evaluation of Laser Weldability of the Third-Generation Advanced High Strength Steel

Péreira

Santos

Carvalho

et al. 2019

Metals

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To meet the demands of vehicular safety and greenhouse gas emission reduction, the automotive industry is increasingly using advanced high strength steels (AHSS) in the production of the components. With the development of the new generation of AHSS, it is essential to study their behavior towards manufacturing processes used in the automotive industry. For this purpose, the welding capability of newly developed third-generation Gen3 980T steel was investigated using the Nd:YAG (Neodymium:Yittrium Aluminum Garnet) laser-welding with different parameter conditions. The analysis was made by uniaxial tensile tests, micro-hardness, Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The criteria used to evaluate the quality of the weld were the distance between the fracture and the weld bead and the surface finish. A relationship between the quality of the weld and the energy density was observed, expressed by a partial penetration for values below the optimal, and by irregularities in the weld bead and a high number of spatters for the values above the optimal.

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Optimal parameters for laser welding of advanced high-strength steels used in the automotive industry

Cited by 32 publications

References 9 publications

Investigation of strengthening mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser-MIG hybrid welding processes

Investigation of strengthening mechanism of commercially pure titanium joints fabricated by autogenously laser beam welding and laser-MIG hybrid welding processes

Laser Welding of Transmitting High-Performance Engineering Thermoplastics

The Evaluation of Laser Weldability of the Third-Generation Advanced High Strength Steel

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