Microstructure and Mechanical Properties of Fiber Laser Welding of Aluminum Alloy with Beam Oscillation

Pang, Xiaolu; Dai, Jiao; Chen, Shun; Zhang, Mingjun

doi:10.3390/app9235096

Cited by 21 publications

(7 citation statements)

References 31 publications

(36 reference statements)

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“…Laser beam oscillation at frequencies of several 100 Hz is generally known to stabilize laser welding processes. Studies have shown that circular beam oscillation produces ner grains and more homogeneously distributed dentrite structures in the weld zone compared to other oscillation mechanisms [23].…”

Section: Introductionmentioning

confidence: 96%

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

AVCI,

Franciosa

2024

Preprint

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The advancement of technology has led to an increased need for new materials, which has necessitated the development of new joining techniques. With the adaptation of advanced automation technology, remote laser welding, which has become increasingly widespread, has facilitated the joining of desired complex structures. In this context, the determination of the laser beam power, which is the locomotive of the welding parameters, before the joining process has played an important role in the weld quality. In this study, 2 mm thick AA6082 plates were joined with a wobling mode remote laser welding system using 4 kW, 3 kW and 2.5 kW laser beam powers. Except for the laser beam power, other parameters were optimized by preliminary studies. The welding process was performed in circular oscillation mode and the time-dependent motion of the laser beam was calculated in advance. The seam geometry, microstructure and hardness properties of the weld line initial, middle and end regions of each joining plate were investigated. As a result of the investigations, full penetration was achieved in the joints made with 4 kW and 3 kW laser powers, but the use of 4kW laser power reduced the weld quality. As a result of using 2.5 kw laser power, full penetration was not achieved and porosity formations were observed. In addition, seam geometry values, HAZ distance and compound dimensions close to the fusion line decreased and weld zone element values changed with decreasing laser power. The transformation in structural and elemental values caused regional hardness changes.

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Section: Introductionmentioning

confidence: 96%

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

AVCI,

Franciosa

2024

Preprint

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“…Aluminum alloys are an important engineering material in the automobile, rail, and aerospace industries as the overall performance meets the requirements of mechanical strength and low weight as well as due to their low density and high specific strength [1]. The surface quality is quite important for the efficient working of machine parts.…”

Section: Introductionmentioning

confidence: 99%

Researching the Process of Laser Structuring of the Surface of Aluminum

Bulavskis

Yankov

Lazov

et al. 2023

ETR

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In this scientific study, the ability to modify the surface using nanosecond 1064 nm fiber laser by controlling the speed and scanning line step in the marking process was demonstrated. An experimental matrix for laser marking was developed, consisting of 8 columns for marking line step and 5 rows for marking speed. The laser marked surfaces were measured using a laser scanning microscope and compared with the surface as supplied. From the obtained deviations of roughness Ra, Rz and Rq as a function of marking speed and marking line step, graphical dependencies were constructed for comparative analysis. The modified roughness is also compared with the roughness as supplied. Within this research the effect of laser treatment on the hydrophilicity/hydrophobicity of the surface was studied as well. Plots of dependences of the contact angle CA, the marking line step Δx and the overlap coefficient Ksoc are plotted.

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“…To overcome the nonuniform power distribution and to produce the desirable energy distribution over a defined surface area, a beam oscillating technique was developed-firstly for the electron beam [12] and, later, for the laser [13]. Recently, laser oscillating welding has gained growing interest, mainly in the field of welding of dissimilar metals [14] and aluminum alloys [11,[15][16][17][18], and also for other alloys such as low carbon steel [19], stainless steel [20,21], and Invar alloy [22]. During oscillating laser processing, the laser head moves along the defined path at a constant velocity, while the laser beam is oscillated at high frequency by a certain trajectory, for example, sinusoidal, square, triangular, circular, elliptical, etc.…”

Section: Introductionmentioning

confidence: 99%

Oscillating Laser Post-Processing of NiCrCoFeCBSi/WC Thermally Sprayed Coatings

et al. 2022

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In the present experimental study, the transverse oscillating laser beam technique was applied for the post-melting of metal matrix composite coatings, thermally sprayed with nickel-based self-fluxing NiCrCoFeCBSi alloy and 40 wt.% WC, to improve their hardness and wear resistance. The study was conducted using the single module optical fiber laser at 300 W power, >9554 W/cm2 power density, 250–1000 mm/min laser speed, 1 mm and 2 mm transverse oscillation amplitude. Scanning electron microscopy, energy dispersive spectroscopy, Knop hardness measurements, and “Ball-on-disc” dry sliding tests were conducted to study the effect of the processing parameters on the molten pool geometry and microstructure, hardness, and tribology of the processed layers. Oscillating laser processing with an amplitude of 1 mm, 250–750 mm/min laser operating speed, and sample preheating to 400 °C gave a satisfactory result: wide and shallow molten pools of ~200–350 μm in depth, hardness between ~1100 and 1200 HV0.2 and minimum cracks obtained. The coatings obtained with laser beam oscillation and preheating, and ~1150 HV0.2 hardness showed an improvement in the wear resistance and friction coefficient (~0.33) of ~2.9 times and ~20%, respectively, compared with the respective values of the coatings remelted in furnace.

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Microstructure and Mechanical Properties of Fiber Laser Welding of Aluminum Alloy with Beam Oscillation

Cited by 21 publications

References 31 publications

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

Researching the Process of Laser Structuring of the Surface of Aluminum

Oscillating Laser Post-Processing of NiCrCoFeCBSi/WC Thermally Sprayed Coatings

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