The Experts below are selected from a list of 19734 Experts worldwide ranked by ideXlab platform
Yoshiaki Morisada - One of the best experts on this subject based on the ideXlab platform.
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development of simplified active flux tungsten inert Gas Welding for deep penetration
Materials & Design, 2014Co-Authors: Yoshiaki Morisada, Hidetoshi Fujii, Ni XukunAbstract:Abstract A new advanced active flux tungsten inert Gas (AA-TIG) Welding technique, named cap active flux tungsten inert Gas (CA-TIG) Welding using atmospheric oxygen, was proposed to increase the penetration depth of a weld. Only a simple nozzle cap with an air inlet was used for the Welding. Flowing inert Gas used as a shielding Gas through a nozzle center led to the aspiration of oxygen from the atmosphere to the molten pool. The penetration depth was increased by the reversal of the Marangoni convection due to the entrained oxygen, and it reached three times deeper than that of the conventional TIG Welding. Additionally, no degradation of the tungsten electrode was observed because it was protected by the inert Gas. The penetration depth was changed by the oxygen content in the molten pool and it could be easily controlled by the nozzle cap design and the Welding parameters.
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development of high frequency tungsten inert Gas Welding method
Materials & Design, 2013Co-Authors: Yoshiaki Morisada, Hidetoshi Fujii, Fuminori Inagaki, Masayoshi KamaiAbstract:Abstract A new Welding method, called high frequency tungsten inert Gas (TIG) Welding, was developed to decrease blowholes in a weld. A1050 aluminum alloy plates (100 mm l × 50 mm w × 5 mm t ) were welded at a frequency from 10 to 40 kHz. An Ar-1% hydrogen mixture was used as the shielding Gas to generate blowholes in the experiments. The Welding was performed in the horizontal position so that the blowholes can easily be a problem. For comparison, a normal TIG Welding was also performed at 60 Hz. After Welding, the distribution of the blowholes in the welds was observed in order to evaluate the effect of the sonic wave. The number of blowholes changed with the frequency. A frequency near 15 kHz is the most suitable to decrease the blowholes. Using this new method, the area of blowholes is decreased to less than about 1/8 of the normal TIG weld. This method is much more effective for decreasing the number of blowholes, compared with an ultrasonic wave vibrator which is directly fixed to the sample.
Arun Kumar Samantaray - One of the best experts on this subject based on the ideXlab platform.
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Determination of Optimal Pulse Metal Inert Gas Welding Parameters with a Neuro-GA Technique
Materials and Manufacturing Processes, 2010Co-Authors: Sukhomay Pal, Surjya K. Pal, Arun Kumar SamantarayAbstract:Optimization of a manufacturing process is a rigorous task because it has to take into account all the factors that influence the product quality and productivity. Welding is a multi-variable process, which is influenced by a lot of process uncertainties. Therefore, the optimization of Welding process parameters is considerably complex. Advancement in computational methods, evolutionary algorithms, and multiobjective optimization methods create ever-more effective solutions to this problem. This work concerns the selection of optimal parameters setting of pulsed metal inert Gas Welding (PMIGW) process for any desired output parameters setting. Six process parameters, namely pulse voltage, background voltage, pulse frequency, pulse duty factor, wire feed rate and table feed rate were used as input variables, and the strength of the welded plate, weld bead geometry, transverse shrinkage, angular distortion and deposition efficiency were considered as the output variables. Artificial neural network (ANN) mod...
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Optimization of quality characteristics parameters in a pulsed metal inert Gas Welding process using grey-based Taguchi method
The International Journal of Advanced Manufacturing Technology, 2009Co-Authors: Sukhomay Pal, Surjya K. Pal, Santosh K. Malviya, Arun Kumar SamantarayAbstract:Optimization of a manufacturing process has to take into accounts all of the factors that influence the product quality and productivity. Optimization of Welding process parameters is considerably complex because Welding is a multi-variable process, which is influenced by a lot of process uncertainties. In this paper, a grey-based Taguchi method has been adopted to optimize the pulsed metal inert Gas Welding process parameters. Many quality characteristic parameters are combined into one integrated quality parameter by using grey relational grade or rank. The Welding process parameters considered in this analysis are pulse voltage, background voltage, pulse frequency, pulse duty factor, wire feed rate, and table feed rate. The quality parameters considered are the tensile strength, bead geometry, transverse shrinkage, angular distortion, and deposition efficiency. Analysis of variance has been performed to find out the impact of individual process parameter on the quality parameters. If the tensile strength as the most important quality parameter is assigned a higher weight, then the pulse voltage was found to be the most influential process parameter. Experiments with the optimized parameter settings, which have been obtained from the analysis, are given to validate the results.
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artificial neural network modeling of weld joint strength prediction of a pulsed metal inert Gas Welding process using arc signals
Journal of Materials Processing Technology, 2008Co-Authors: Sukhomay Pal, Surjya K. Pal, Arun Kumar SamantarayAbstract:This paper addresses the weld joint strength monitoring in pulsed metal inert Gas Welding (PMIGW) process. Response surface methodology is applied to perform Welding experiments. A multilayer neural network model has been developed to predict the ultimate tensile stress (UTS) of welded plates. Six process parameters, namely pulse voltage, back-ground voltage, pulse duration, pulse frequency, wire feed rate and the Welding speed, and the two measurements, namely root mean square (RMS) values of Welding current and voltage, are used as input variables of the model and the UTS of the welded plate is considered as the output variable. Furthermore, output obtained through multiple regression analysis is used to compare with the developed artificial neural network (ANN) model output. It was found that the Welding strength predicted by the developed ANN model is better than that based on multiple regression analysis.
Wenya Peng - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of ultrasonic pulse frequency tungsten inert Gas welded ti 22al 25nb at alloy butt joint
Journal of Materials Processing Technology, 2018Co-Authors: Ling Shao, Amit Datye, Haitao Zhao, Miles Petterson, Wenya PengAbstract:Abstract Microstructural observations of cross sections of butt joints of Ti-22Al-25Nb (at.%) alloy manufactured using ultrasonic pulse frequency tungsten inert Gas Welding method at different Welding parameters without and with Welding wire, the butt joint at 50 KHz pulse frequency with Welding wire has the largest equiaxed crystal zone, finest columnar crystals, and improves damage of dendritic crystals and overburning. The tensile strength, yield strength and elongation of butt joint at 50 KHz Welding frequency with Welding wire are the highest, compared with those of butt joints at other Welding parameters without Welding wire, and the fracture of it is ductile fracture mode of dimples. Further, fusion zone composed of α2 + β/B2 two phases and heat affected zone composed of α2 + O + β/B2 three phases in the butt joint having the highest tensile strength are determined using X-ray diffraction technology. In this butt joint, the microhardness of heat affected zone is the highest, followed by that of base material, fusion zone lowest.
Xinjian Yuan - One of the best experts on this subject based on the ideXlab platform.
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tungsten inert Gas Welding brazing of az31b magnesium alloy to tc4 titanium alloy
Journal of Materials Science & Technology, 2016Co-Authors: Guangmin Sheng, Hui Wang, Ke Feng, Xinjian YuanAbstract:Tungsten inert Gas (TIG) Welding–brazing technology using Mg-based filler was developed to join AZ31B Mg alloy to TC4 Ti alloy in a lap configuration. The results indicate that robust joints can be obtained with Welding current in the range of 60–70 A. The joint interface was found to be likely composed of Mg–Ti diffusion reaction layer accompanied with Mg17Al12 precipitate phase, indicating that metallurgical joining was achieved. The optimized joint with average tensile-shear strength of 190 N/mm2 was obtained and fracture occurred at the Ti/fusion zone interfacial layer during tensile test. Moreover, the fracture surface was characterized by equiaxed dimple patterns accompanied with a few lamellar tearing. Finally, finite element modeling (FEM) numerical simulation was developed to analyze the distribution characteristics of the temperature field of joints.
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reinforcement of mg ti joints using ultrasonic assisted tungsten inert Gas Welding brazing technology
Science and Technology of Welding and Joining, 2014Co-Authors: Guangmin Sheng, Haodong Wang, Xinjian YuanAbstract:Ultrasonic assisted tungsten inert Gas Welding–brazing technology was developed to refine coarsening columnar α-Mg grains of Mg/Ti joints. In this study, ultrasonic vibration was introduced into molten pool of Mg/Ti joints with frequency of 20 kHz and maximum power of 1·6 kW. The results showed that, with ultrasonic power of 1·2 kW, the morphology of columnar α-Mg grains was refined to approximately equiaxed grains and the average grain size of columnar grains decreased from 200 to ∼50 μm. Moreover, the maximum joint strength of joints increased ∼18·1% to 228 N mm−1 over the joints welded without ultrasonic vibration (193 N mm−1). Furthermore, the optimised Mg/Ti joint fractured at base metal zone rather than fusion zone upon tensile–shear loading, indicating that efficient grain refinement was attained. However, Welding voids occurred with the ultrasonic power further increased to 1·6 kW, which resulted in the decrease in mechanical properties.
Ni Xukun - One of the best experts on this subject based on the ideXlab platform.
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development of simplified active flux tungsten inert Gas Welding for deep penetration
Materials & Design, 2014Co-Authors: Yoshiaki Morisada, Hidetoshi Fujii, Ni XukunAbstract:Abstract A new advanced active flux tungsten inert Gas (AA-TIG) Welding technique, named cap active flux tungsten inert Gas (CA-TIG) Welding using atmospheric oxygen, was proposed to increase the penetration depth of a weld. Only a simple nozzle cap with an air inlet was used for the Welding. Flowing inert Gas used as a shielding Gas through a nozzle center led to the aspiration of oxygen from the atmosphere to the molten pool. The penetration depth was increased by the reversal of the Marangoni convection due to the entrained oxygen, and it reached three times deeper than that of the conventional TIG Welding. Additionally, no degradation of the tungsten electrode was observed because it was protected by the inert Gas. The penetration depth was changed by the oxygen content in the molten pool and it could be easily controlled by the nozzle cap design and the Welding parameters.