Experimental and numerical study of temperature field and molten pool dimensions in dissimilar thickness laser welding of Ti6Al4V alloy

2020 ◽  
Vol 49 ◽  
pp. 438-446 ◽  
Author(s):  
Zhixiong Li ◽  
Khashayar Rostam ◽  
Afshin Panjehpour ◽  
Mohammad Akbari ◽  
Arash Karimipour ◽  
...  
Keyword(s):  
Temperature Field ◽  
Laser Welding ◽  
Molten Pool ◽  
Numerical Study ◽  
Ti6al4v Alloy ◽  
Dissimilar Thickness

scholarly journals NUMERICAL STUDY OF THE TEMPERATURE FIELD FOR Fe3Al LASER WELDING

2021 ◽  
Vol 55 (3) ◽  
Author(s):  
Josef Bradáč ◽  
Jiří Hozman ◽  
Jan Lamač
Keyword(s):  
Temperature Field ◽  
Laser Welding ◽  
Numerical Scheme ◽  
Numerical Study ◽  
Welding Process ◽  
Beam Power ◽  
Welding Parameters ◽  
Original Experiment ◽  
Butt Weld ◽  
Welding Processes

The main objective of this paper was focused on a numerical study related to a proper evaluation of the temperature field during the laser-welding process. The investigated material used for the experiments was Fe3Al, given its properties and promising application potential. The original experiment was based on a 3D model of a butt weld. However, to reduce the computational complexity, a planar variant of the heat-transfer equation with suitable choices of surface and volumetric heat sources, given by modified Gaussian pulses, is used to model the temperature distribution in the fixed cross cut during the laser welding. Subsequently, the numerical scheme based on the discontinuous Galerkin method was employed to evaluate the temperature field more properly and to identify the main characteristics of the molten zone. Finally, the numerical study was performed for various combinations of the welding parameters, such as laser-beam power and welding speed. The obtained results were in good agreement with the expected behavior, and thus illustrate the optimization potential of the proposed numerical scheme in the similar issues of a laser-welding processes.

scholarly journals High-Speed X-Ray Transmission and Numerical Study of Melt Flows inside the Molten Pool during Laser Welding of Aluminum Alloy

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Jin Peng ◽  
Liqun Li ◽  
Shangyang Lin ◽  
Furong Zhang ◽  
Qinglong Pan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Welding Speed ◽  
Molten Pool ◽  
High Speed ◽  
Numerical Study ◽  
Flow Behavior ◽  
Front Wall ◽  
X Ray ◽  
Rear Part

By using the X-ray transmission imaging system, melt flows inside a molten pool were studied during laser welding of aluminum alloy at different welding speeds. Then, the correlation between temperature gradients along the direction of weld penetration and melt flows in the rear part of a molten pool was analyzed by using a three-dimensional numerical method. And the presented model was verified by experimental results. The corresponding investigation was carried out to further study the correlation between temperature gradient and melt flow behavior of the molten pool in the plate heated by preheating temperature. The results indicated that, in the rear part of the molten pool, the maximum flow velocity was located at the bottom of the molten pool. The melt metal in the rear molten pool caused by different welding speeds had significantly different flow trends. As the welding speed increased, the absorbed intensity on the keyhole front wall also increased as well as the recoil pressure that could maintain the keyhole opened. Consequently, the increase of the welding speed was more beneficial to improving the stability of the molten pool.

scholarly journals Characteristics of the Molten Pool Temperature Field and Its Influence on the Preparation of a Composite Coating on a Ti6Al4V Alloy in the Micro-Arc Oxidation Process

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 464
Author(s):  
Xinyi Li ◽  
Chaofang Dong ◽  
Qing Zhao ◽  
Fasong Cheng
Keyword(s):  
Temperature Field ◽  
Composite Coating ◽  
Molten Pool ◽  
Composite Coatings ◽  
Secondary Phase ◽  
Ti6al4v Alloy ◽  
Temperature Phase ◽  
Active Period ◽  
Long Distance ◽  
Micro Arc Oxidation

In this study, the phase transition of secondary phase particles in a composite coating is used to estimate the temperature field of the molten pool on a Ti6Al4V alloy in the micro-arc oxidation (MAO) process. The behavior of the sparks and the molten pool during the MAO process was observed in real-time by a long-distance microscope. The microstructures and compositions of the composite coatings were studied by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The results revealed that, for the temperature field distribution range of the molten pool in the active period, the lower limit is 2123 K and the upper limit is not lower than 3683 K. The reason for the multiphase coexistence is that the high-temperature phase is retained by the rapid cooling effect of the electrolyte, and the low-temperature phase is formed due to secondary phase transformation during the long active time of the molten pool temperature field. The strengthening mechanism of the composite coating prepared by adding the secondary phase particles is elemental doping rather than particle enhancement. The secondary phase particles are able to enter the composite coating by adhering to the surface during the cooling process. The secondary phase particles will then be wrapped into the coating in the next active period.

Influence of laser pulse on solidification of molten pool during laser welding of dissimilar Ti-based amorphous alloys

2021 ◽  
Vol 26 (3) ◽  
pp. 264-272
Author(s):  
Minghua Chen ◽  
Dongmin Wei ◽  
Chenbin Li ◽  
Liang Liu ◽  
Qi Zhou ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Welding ◽  
Amorphous Alloys ◽  
Molten Pool

Ytterbium fiber laser welding of Ti6Al4V alloy

2015 ◽  
Vol 20 ◽  
pp. 250-256 ◽  
Author(s):  
Giuseppe Casalino ◽  
Michelangelo Mortello ◽  
Sabina L. Campanelli
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Ti6al4v Alloy ◽  
Fiber Laser Welding
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