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Investigation of optimal process parameters for laser cutting of Inconel-718 sheet
摘要： Precise machining of advance material like Inconel-718 is an emerging need. Selection of an appropriate optimal range of cutting parameters is quite essential to achieve the high-quality cut and is a challenging task within this domain of study. The aim of this research is to develop a robust prediction model, which can suggest the desired range of cutting parameters for accomplishing better cutting quality, precision, and geometrical accuracy. Experiments have been performed on a 300 W (CNC-PCT 300) pulsed Nd: YAG laser cutting system at various levels of input cutting parameters, namely gas pressure, standoff distance, cutting speed, and laser power. Thereafter, response surface methodology has been adopted to develop mathematical models in terms of aforementioned input cutting parameters for geometrical quality characteristics: top kerf width and bottom kerf width. These developed models have been validated by comparing the predicted values with the experimental ones. Further, these models have been optimized using the multiobjective genetic algorithm in order to ascertain the optimal range of cutting parameters pertaining to better quality cut with high precision and geometrical accuracy.
关键词： laser cutting,response surface method,Inconel-718,genetic algorithm
更新于2025-09-16 10:30:52
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Correlation of Process Parameters and Porosity in Laser Welding of 7A52 Aluminum Alloy using Response Surface Methodology
摘要： The article presents an experimental investigation of the effect of process parameters (i.e. laser power, welding speed and defocus distance) on porosity in laser welding of 7A52 aluminum alloy. A three-factor, three-level factorial Box–Behnken design (BBD) of response surface methodology (RSM) was used to complete the design matrix with the objective of optimizing the process parameters. Multiple regression models were established to predict the correlation between the selected process parameters and porosity, and then were tested for adequacy using analysis of variance (ANOVA). The results showed that macro pores in laser welding seam were mainly keyhole induced, and porosity susceptibility was mostly dominated by welding speed. The optimal combination of process parameters is the laser power of 3.5kW, welding speed of 10.0mm/s, and the defocus distance of +4.0mm. Under the optimal process parameters, superior weld seams without macro pore were produced. The predicted porosity area fraction with RSM models was confirmed to be in good agreement with the measured values of validation experiments.
关键词： process parameter,response surface methodology,porosity,7A52 aluminum alloy,laser welding
更新于2025-09-16 10:30:52
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Optimization of laser welding of DP780 to Al5052 joints for weld width and lap-shear force using response surface methodology
摘要： A laser welding of DP780 steel to Al5052 joint has been investigated to optimize the weld width and lap-shear force. Four types of steel-Al welded joints and fracture model have been proposed. Response surface methodology and central composite design were applied to develop mathematical relationships between the control parameters and the responses. Then, the validation and optimization experiments were carried out to check the models adequacy. The results show that there exists good consistency between the predicted and actual value. This indicates the developed models could predict the weld width and lap-shear force within the limits of the process parameters.
关键词： Steel-Al dissimilar alloys,Response surface methodology,Laser penetration welding
更新于2025-09-16 10:30:52
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Prediction of Weld Interface Depth and Width at Optimum Laser Welding Temperature for Polypropylene
摘要： In this preliminary research, Through Transmission Laser Welding (TTLW) of polypropylene is systematically studied through finite element method (FEM) and response surface methodology (RSM) combined approach. The thermal field simulated by solving a three-dimensional transient heat diffusion equation using COMSOL Multiphysics. Statistical software Minitab v17 has been used to develop an experimental design as per central composite design. The objective of the work is in twofold. The first objective of the study aims to develop mathematical models to predict the weld interface depth (MD), weld interface width (MW) and maximum temperature (Tmax), primarily in terms of the process line-energy. The developed mathematical models are examined by analysis-of-variance (ANOVA) technique to check their adequacy. The second objective of the study is to establish an optimised combination of laser welding parameters (laser power, scanning speed and spot diameter) to prevent polypropylene thermal degradation. The desirable MD and MW conditions have been predicted for the established optimised set of laser welding parameters. The results from this preliminary investigation using a FEM approach, can provide the basis for future design of experiments to help predict and obtain enhanced weld quality for polypropylene specifically and other polymer material system in general.
关键词： polypropylene,finite element method,response surface methodology,through transmission laser welding,weld bead dimensions
更新于2025-09-12 10:27:22
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Optimization of process parameters during laser cutting of Ni-based superalloy thin sheet using response surface methodology
摘要： The present investigation deals with the modeling and optimization of multiple quality characteristics of kerf geometry during pulsed Nd: YAG laser cutting of nickel based superalloy thin sheet along the straight cut profile. Top kerf deviation and kerf taper are considered as quality characteristics. These laser cut quality characteristics are the functions of four input parameters are namely: lamp current, Pulse duration, Pulse repetition rate and Scanning speed. Box-Behnken design (BBD) based experiments have been conducted to obtain experimental results of cut quality characteristics for the study. The experimental results have been analyzed for developing models and optimizing the responses using response surface methodology (RSM).
关键词： Box-Behnken design,laser cutting,Response surface methodology,superalloy sheet
更新于2025-09-12 10:27:22
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Free Space Optical Communication (System Design, Modeling, Characterization and Dealing with Turbulence) || 5. Low power and compact RSM and neural-controller design for beam wandering mitigation with a horizontal-path propagating Gaussian-beam wave: focused beam case
摘要： Beam wander on the detector plane is one of the main causes of major power loss which severely degrades the performance of Free Space Optical (FSO) links. Confronted with this big problem, designing a suitable controller to compensate beam wandering at a fast rate so as to increase beam stability becomes significant. This chapter presents an investigation of the performance of two types of controller designed for increasing the stability of the beam on the detector plane under dynamic disturbances. The first design is based on Taguchi’s method: Response Surface Model (RSM) controller while the second is the Artificial Neural Network (ANN) method (neural-controller). These controllers process the beam spot information and generate the necessary outputs to mitigate beam wandering, so as to perfectly couple the Power In the Bucket (PIB): receiver aperture, into the detector. Pipelined-parallel architecture for both controllers are proposed and developed in a Field Programmable Gate Array (FPGA). The implementation of these two candidate controllers is described in detail as installed at the receiver station. Evidence of the suitability and the effectiveness of the proposed controllers in terms of prediction exactness, prediction error, reduction of beam wander, response to impulse and effective scintillation index are provided through experimental results from the FSO link established for the horizontal range of 0.5 km at an altitude of 15.25 m.
关键词： Artificial Neural Network (ANN),Field Programmable Gate Array (FPGA),beam wander,Free Space Optical (FSO) links,Response Surface Model (RSM)
更新于2025-09-12 10:27:22
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Modeling and optimization for laser cladding via multi-objective quantum-behaved particle swarm optimization algorithm
摘要： The process parameters of laser cladding have significant effects on the quality of the laser clad coating. Generally, optimizing one property usual lead to deterioration in some other performances. In this study, the influence of key parameters to preparing the CoCr1.5FeNiNb0.5 coating, namely laser beam power, scanning speed and defocus, on the dilution and residual stress were systematically researched. The polynomial model for the parameters on dilution and residual stress was designed by response surface methodology and the effect of each parameter on the responses was investigated. Then the quadratic models were used as the constraint functions and multi-objective quantum-behaved particle swarm optimization was applied to find the minimum dilution and residual stress. At last, the optimal process parameters were predicted by this algorithm and the high entropy alloy coating was manufactured. The CoCr1.5FeNiNb0.5 HEA coating consisted of FCC and Laves phase.
关键词： Dilution,Residual stress,Response surface methodology,Laser cladding,Multi-objective
更新于2025-09-12 10:27:22
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Response surface methodology can be used to predict photoinactivation of foodborne pathogens using Rose Bengal excited by 530?nm LED
摘要： In this work, the photodynamic bactericidal effect of Rose Bengal (RB), combined with green LED light, against Staphylococcus aureus and Salmonella Typhimurium, was investigated. The interaction of RB concentration and illumination time was evaluated using a response surface methodology, and a second-order polynomial empirical model was adjusted to the experimental data. The derived model predicted the combined influences of these factors on S. aureus and S. Typhimurium counts, in accordance with predictions and experimental observations (R2 = 0.8483 and p = .0013 for S. aureus; R2 = 0.9191 and p = .0001 for S. Typhimurium). Total inhibition of S. aureus and S. Typhimurium was observed when applying a light dose of 0.125 J cm?2 and 152.0 J cm?2, respectively. The treatments also showed loss of membrane integrity, morphological changes, and internal cell structural alterations. In sum, the polynomial model developed could provide accurate information on the combined influences of RB and green LED light in aPDT treatment and, that this combination was able to inactivate S. aureus and S. Typhimurium.
关键词： Rose Bengal,green LED light,Salmonella Typhimurium,response surface methodology,Staphylococcus aureus,photodynamic bactericidal effect
更新于2025-09-11 14:15:04
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Optimization of welding parameters on pores migration in Laser-GMAW of 5083 aluminum alloy based on response surface methodology
摘要： The mathematical model to reveal the relationship between process parameters and pores migration distance of 5083 aluminum alloy Laser-GMAW was established based on the center composed design of response surface methodology. Three of the welding parameters were chosen as the factors: The welding current, welding speed, and the laser-arc distance. The distance between pores and weld bottom was calculated as the response value. The analysis of variance was used to test the significance of the model. According to the result of experiments, the low welding speed and high current were beneficial to decrease the solidification rate of the molten pool, the pores could overflow from the weld in time. When welding speed is increasing, it is necessary to appropriately increase the welding current and the Laser-arc distance, the volume of the molten pool would be expanded, pores were difficult to be caught by solidifying wall. The optimized parameters of the 30 mm aluminum alloy Laser-MIG hybrid welding were calculated based on the established model. The maximum pores migration distance can be obtained in 135 A/0.6 m/min/1.22 mm (welding current/welding speed/laser-arc distance).
关键词： Laser-arc welding,Pores migration,Response surface methodology
更新于2025-09-11 14:15:04
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Effect of shielding gas flow rate on cladding quality of direct laser fabrication AISI 316L stainless steel
摘要： Direct laser fabrication (DLF) has been widely used as an additive manufacturing technology. However, the effect of shielding gas flow rate and interaction among other parameters such as laser power, scanning speed, and powder feed rate in fabrication have not been studied. In this study, four factors were evaluated by two levels of full factorial experiment and response surface methodology (RSM). Thus, the interactions between processing parameters affecting two responses (shape factor and dilution rate) were determined, and regression models for two responses related to shielding gas flow rate were statistically evaluated for the first time. Interactive optimization was performed using contour and surface plots. Hence, the optimum combinations of four parameters were verified by metallurgical and mechanical analyses. More uniform surface profiles and finer microstructures can be obtained by adjusting the shielding gas flow rate. The results show that shielding gas flow rate and its interaction with other parameters for two responses play an important role in fabricating parts of AISI 316 L stainless steel. This fundamental study provides the significance of this parameter and better understanding of interaction between multiple processing parameters.
关键词： Full-Factorial experiment,Response surface,Methodology,Direct laser fabrication
更新于2025-09-11 14:15:04