Numerical optimization approaches of single-pulse conduction laser welding by beam shape tailoring

Sundqvist, Jesper; Kaplan, Alexander; Shachaf, L.; Brodsky, Alexander; Kong, Choon Yen; Blackburn, Jon; Assunção, Eurico; Quintino, L.

doi:10.1016/j.optlaseng.2015.12.001

Cited by 19 publications

(9 citation statements)

References 22 publications

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“…The ionization process involves removing or adding electrons to the atoms or molecules, creating charged particles. The plasma, consisting of ionized particles, can exhibit a slightly conical or cylindrical shape due to the dynamics of the shock wave and the interaction with the surrounding environment [3][4][5][6][7][8].…”

Section: Surface Morphologymentioning

confidence: 99%

Laser Induced Shock Wave Studies of Aluminum Metal

Abdulzahra¹

2023

Preprint

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Non-destructive laser testing (NDLT) or laser shock penning (LSP) describes the no-damaging material testing method by employing a laser; this denies damaging or inducing helpfulness to give information about a material or component. The experimental study examined the physical characteristics of aluminum and compared it with normalized Hugoniot data. The experimental data depends on studying super eye images supported by SEM images to study the track effect induced by different energy of nanosecond Nd-YAG laser in Laser-Induced Shock Peening (LSP). The forward velocity of the shock wave depends on the material and the sample's shocked medium related to the excised atoms' ionization rates. It noted that the LSP of Al in water and ethanol is the closest to the little shock Hugoniot data pressure is 4.5 GPa, while it is typically (0.46,3.2, and 3) GPa when the incident laser intensity is 11.4 GW/cm2 in air, water, and ethanol media. NDLT technique could apply to examine material shock properties like (particle velocity, shock time, shock wavelength, shock energy, shock intensity, loudness, and force) which is essential to finding mechanical properties. We compared NDLT with classical measurements where Stress-Strain was measured by Tensile test, and the hardness was measured by Vicker hardness; we found the shocked Al in water and ethanol gives more matching for the tensile test. The Vickers hardness more matching when shocked Al in water. In addition, the Elastic Modulus value by the Tensile test is 28 GPa, while by NDLT is (8.4MPa, 4.9, 4.7G Pa) in air, water, and ethanol media.

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Section: Surface Morphologymentioning

confidence: 99%

Laser Induced Shock Wave Studies of Aluminum Metal

Abdulzahra¹

2023

Preprint

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“…Optimizing the machining parameters for the pulse duration, repetition rate, and combined pulse has been the focus of considerable interest [3][4][5][6][7][8]. A growing number of theoretical and experimental works have also investigated the effects of atmosphere pressure on the processed material [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Beam Mode on Hole Properties in Laser Processing

Zhang,

Li,

Zhang

et al. 2024

Coatings

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The laser beam mode affects the power density distribution on the irradiated target, directly influencing the product quality in laser processing, especially the hole quality in laser drilling. The Gaussian beam shape, Mexican-Hat beam shape, Double-Hump beam shape, and Top-Hat beam shape are four typical laser beam modes used as a laser heat source and introduced into our proficient laser-drilling model, which involves complex physical phenomena such as heat and mass transfer, solid/liquid/gas phase changes, and two-phase flow. Simulations were conducted on an aluminum target, and the accuracy was verified using experimental data. The results of the simulations for the fundamental understanding of this laser–material interaction are presented in this paper; in particular, the hole shape, including the depth–diameter ratio and the angle of the cone, as well as spatter phenomena and, thus, the formed recast layer, are compared and analyzed in detail in this paper. This study can provide a reference for the optimization of the laser-drilling process, especially the selection of laser beam mode.

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“…When using a pulsed-periodic beam, the redistribution of energy density can also provide an opportunity to improve the structure and properties of the welded joint. For example, in [19,20], a method was studied where overlap conduction mode welding was used to produce a shaped joint of sheet materials. In this case, it was possible to adjust the penetration depth by changing the pulse energy and duration.…”

Section: Introductionmentioning

confidence: 99%

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

et al. 2022

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Sandwich panels are promising composite materials, although the possibilities for their thermal joining are limited due to the degradation of the polymer core at elevated temperatures. The purpose of this study is to improve the quality of the butt joints in metal–polymer sandwich composites performed by laser welding. A pulsed Nd:YAG Rofin StarWeld Performance laser was used to perform the two-sided welding of the metal–polymer three-layer composite material. On each of the two sides of the material, a welded joint was made with partial penetration of the covering steel sheets, which was considered a prerequisite for preventing the degradation of the core polymer layer. The energy density of the laser irradiation was redistributed by increasing the diameter of the laser spot. The structure of the welded joints was examined using a polarized optical microscope and a scanning electron microscope. It was determined that the laser treatment resulted in a partial penetration weld on each of the two covering metal sheets of the material, reaching a depth of more than 50% of the sheet’s thickness without damaging the polymer. The welding area consisted of two zones, one being the weld metal and the other the heat-affected zone. As a result of relatively rapid heating and cooling cycles, fine-dispersed structures were formed in the heat-affected and remelted zones. The performed tensile tests showed that the strength of the welded area was about 80% of that of the base material.

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Numerical optimization approaches of single-pulse conduction laser welding by beam shape tailoring

Cited by 19 publications

References 22 publications

Laser Induced Shock Wave Studies of Aluminum Metal

Laser Induced Shock Wave Studies of Aluminum Metal

Effects of Beam Mode on Hole Properties in Laser Processing

Improving the Quality of Laser-Welded Butt Joints of Metal–Polymer Sandwich Composites

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