Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Laazizi, Abdellah; Courant, Bruno; Jacquemin, Frédéric; Andrzejewski, H.

doi:10.1016/j.optlastec.2011.03.019

Cited by 19 publications

(4 citation statements)

References 20 publications

(26 reference statements)

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“…Figure 6 is the temperature results simulated under the heating parameter combination of P 0 = 1710 W (P in = 153 W), f = 30 Hz, τ = 3 ms and t = 3 s. Figure 6a shows the temperature of the laser heating central point on the surface of the filler alloy. When heat flux is periodically applied to the filler alloy, the temperature rapidly increases following the periodic fluctuation mode that coincides with the rhythm of the pulsed heat source, which is similar to the simulated temperature curve shown in [25,26]. Figure 6a shows the temperature of the laser heating central point on the surface of the filler alloy.…”

Section: Calibration and Validationsupporting

confidence: 65%

Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools

Wang

Huang

et al. 2019

Metals

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A 3D finite element (FE) model is built to numerically analyze heating parameters on temperature during brazing diamond grains by the pulsed laser spot heating. A pulsed Nd:YAG laser is used for experimental validation. The results show that during laser heating, the temperature varies periodically because of the pulsed heat flux. Four key thermal indices, the maximum temperature Tmax, the minimum temperature Tmin, the average temperature Tav and the temperature fluctuation amplitude ΔT are addressed. The primary factor affecting Tmax, ΔT and Tav is the pulse power and on Tmin is the pulse frequency. The secondary effect factor on Tmax, Tav and ΔT is the pulse width and on Tmin is the pulse power. For engineering practice, the order of designing heating parameters is recommended as: pulse power, second frequency and last width.

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Section: Calibration and Validationsupporting

confidence: 65%

Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools

Wang

Huang

et al. 2019

Metals

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“…In the present research work, the arc pressure is neglected due to the low welding currents [17]. The following equations govern the fluid flow and the temperature transfer [18]:…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation of the effect of driving forces on the weld pool convection and thermal stress in a GTAW process

Bensada

Laazizi²,

Fri³

et al. 2022

Preprint

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The present research article aims to obtain good weld integrity and avoid material fracture due to high welding temperature. The Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) were used to study GTAW process. The heat source distribution and the convection movement in the melted pool were taking into account. In fact, a two-dimensional (2D) numerical model has been developed for GTAW process and applied for 304L stainless steel. The effects of welding operating parameters were discussed such as voltage and current. The simulation showed that capillary force presented by Marangoni convection affects mainly the weld pool geometry. Therefore, as a result, increasing the welding power and specially the current intensity leads to the growth of the melted zone rapidly, which may induce high residual stress and risks of metal failure. Finally, comparing computed weld profile with the experimental results showed good agreement.

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“…Unmelted powders may have existed in the manufacturing process when the powder was not properly wetted to the underlying metal due to the in uence of the internal oxygen content. The porosity is also generated through powder spattering and metal evaporation [10,11]. These transitions may have a negative impact on the mechanical properties of the nal manufactured part.…”

Section: Introductionmentioning

confidence: 99%

The effects of energy density and heat treatment on the properties of 3D printed tungsten

Chen,

Yang

2023

Preprint

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A large temperature gradient led to rapid temperature changes in the selective laser melting (SLM) process, resulting in high residual stress and micro-cracks, which were the main challenges faced by the 3D printing of tungsten (W) materials. On the other hand, the volumetric energy density had a significant effect on the density of the pure W structural component fabricated by SLM. It was difficult to eliminate defects in the formed parts solely by optimizing SLM technology parameters. The crystalline W powder with a concentrated grain size was used as the raw material, and substrate preheating was adopted to prepare the W structural component with a lattice structure by selective laser melting (SLM). The processed samples were subsequently subjected to heat treatment at 1100℃, 1400℃, 1700℃and 1900℃ for 2 hours. The mechanical properties and microstructure of the specimens at different heat treatment temperatures were analyzed. The results indicate that the optimal volumetric energy density for obtaining a theoretical density of 96.2% is around 972 J/mm3. After the heat treatment at 1700℃, the samples achieved the best mechanical performance, with an ultimate compressive strength and microhardness reaching 1200 MPa and 457HV, respectively. The fracture morphology shows cleavage fracture characteristics, and microcracks were largely eliminated after the heat treatment at 1700℃, indicating strong metallurgical bonding between layers and particles.

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Applied multi-pulsed laser in surface treatment and numerical–experimental analysis

Cited by 19 publications

References 20 publications

Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools

Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools

Numerical investigation of the effect of driving forces on the weld pool convection and thermal stress in a GTAW process

The effects of energy density and heat treatment on the properties of 3D printed tungsten

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