Laser beam welding of hot crack sensitive Al-alloys without filler wire by intensity controlled dynamic beam oscillation

Dittrich, Dirk; Keßler, Benjamin; Strohbach, R.; Jahn, Axel

doi:10.1016/j.procir.2022.08.182

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Modern laser beam sources or mirror‐optical manipulations of the laser beam to adjust the intensity of the beam in the welding area dominate recent developments for process stabilization. For example, Dittrich et al [ 15 ] were able to significantly reduce instabilities in the keyhole and at the same time significantly reduce hot cracking in their investigations on AA7075 by using scanner optics with high beam deflection (up to 4 kHz). Another approach, which also aims to minimize the tendency to hot cracking, is described in the work of Norman et al [ 16 ] and Sokoluk et al [ 17 ] In an alternative to the approaches described so far, the weldability is not improved via the laser beam, but via a metallurgical approach by using special filler materials.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Strength Assessment of Laser Beam Welded Joints Made of AA7075 and Magnetic Pulse Welded Joints Made of AA7075 and 3D‐Printed AlSi10Mg

et al. 2023

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The use of 7000 aluminum alloys has an important role in future lightweight structures in the field of mobility due to the low density and high strength. However, these alloys can only be fusion welded to a limited extent because welding defects can rarely be prevented. For this reason, investigations are carried out to identify the most suitable welding parameters for two processes: laser beam and magnetic pulse welding. Herein, laser beam welding is successfully used to manufacture a roll‐formed and longitudinally welded pipe made of AA7075 and joined by magnetic pulse welding with a 3D‐printed lug‐tube made of AlSi10Mg. The fatigue strength of these pipe joints and of laser beam welded butt joint specimens is determined using load‐controlled fatigue tests. For the characterization of the specimens, cross sections are prepared and examined metallographically, which reflect the local weld seam geometry in the joining area. A fatigue assessment is made using linear‐elastic approaches. The reference radius concept is applied to map the influence of geometric notches on the fatigue strength, assuming linear‐elastic stress–strain behavior. It is shown that the recommended notch stress fatigue class FAT 178 (von Mises stress) can be applied for a safe and reliable fatigue assessment.

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Section: Introductionmentioning

confidence: 99%

Fatigue Strength Assessment of Laser Beam Welded Joints Made of AA7075 and Magnetic Pulse Welded Joints Made of AA7075 and 3D‐Printed AlSi10Mg

et al. 2023

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Mechanisms of Increasing Weld Depth during Temporal Power Modulation in High‐Power Laser Beam Welding

Grajczak,

Reynders,

Nowroth

et al. 2024

Adv Eng Mater

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Understanding the fundamental mechanisms of action for increasing weld depth during temporal power modulation in laser beam welding could allow dissimilar rotational welding without the introduction of concomitant turbulence, but with enhanced intermixing. The investigations are conducted on 30 mm‐diameter round bars of stainless steel alloy 1.4301 and nickel base alloy 2.4856 utilizing a 16 kW disk laser beam source. Modulation frequencies are 0/50/100/200 Hz at low, medium, and high amplitudes of laser beam power. The influence on the process and weld characteristics is investigated through high‐speed imaging with grayscale analysis, keyhole depth measurements, metallographic sections, and energy‐dispersive X‐ray spectroscopy analysis. The objectives are successfully achieved, and the underlying mechanism is maintaining the keyhole depth at a higher level for modulation frequencies of 200 Hz and a high amplitude of laser beam power, which is related to the keyhole inertia. Based on this, a novel welding mode with a constant keyhole depth is proposed. Furthermore, up to 20% increase in weld depth is achieved, a saturation limit for the modulation frequency is identified, intermixing within the weld is enhanced, and a model for predicting the weld depth based solely on measurements of the surface width is developed.

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Experimental study on morphology, microstructure and mechanical properties of adjustable-ring-mode (ARM) laser welded Al-Mg alloy

Guo,

Jin,

Wei

et al. 2024

CIRP Journal of Manufacturing Science and Technology

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Laser beam welding of hot crack sensitive Al-alloys without filler wire by intensity controlled dynamic beam oscillation

Cited by 4 publications

References 5 publications

Fatigue Strength Assessment of Laser Beam Welded Joints Made of AA7075 and Magnetic Pulse Welded Joints Made of AA7075 and 3D‐Printed AlSi10Mg

Fatigue Strength Assessment of Laser Beam Welded Joints Made of AA7075 and Magnetic Pulse Welded Joints Made of AA7075 and 3D‐Printed AlSi10Mg

Mechanisms of Increasing Weld Depth during Temporal Power Modulation in High‐Power Laser Beam Welding

Experimental study on morphology, microstructure and mechanical properties of adjustable-ring-mode (ARM) laser welded Al-Mg alloy

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