The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform

Dongjie Yang - One of the best experts on this subject based on the ideXlab platform.

  • Plasma behavior and control with small diameter assisting gas Nozzle during CO2 laser welding
    Journal of Materials Processing Technology, 2016
    Co-Authors: Yong Zhao, Kaili Zhu, Qing Shang, Jian Huang, Dongjie Yang
    Abstract:

    Abstract The laser-induced plasma is an important physical phenomenon during the process of penetration welding with high-power CO 2 laser. To study the effect of assisting gas in the laser-induced plasma behavior and characteristics of weld formation, different configurations of heat input and Side assisting gas were arranged to investigate the plasma behavior, and plasma images were recorded using high speed camera. By analyzing plasma images, spectrum intensity, and static pressure, the results have showed that the application of Side assisting gas suppresses the laser-induced plasma significantly and improves the utilization of laser power, in which a sound weld quality is obtained. The combination of Side Nozzle used in the study with a gas flow rate around 20 L/min, the mixed gas composed of helium and argon in which helium accounted for 75%, and the position of Side Nozzle in which x and y were set at around 0 mm, h was set at around 6 mm could bring good controlling effect on plasma and well weld seam profile as well as deeper penetration. The reference value provides a promising solution to improve the absorption and efficiency of laser power during CO 2 laser welding using Side assisting gas.

S L Gong - One of the best experts on this subject based on the ideXlab platform.

  • Numerical and experimental study of the effect of Side assisting gas during laser welding
    Modelling and Simulation in Materials Science and Engineering, 2006
    Co-Authors: Linjie Zhang, Jianxun Zhang, A Q Duan, S L Gong
    Abstract:

    The influences of Side assisting gas flow conditions on the behaviour of laser induced plasma during laser welding process were studied using a two-dimensional model assuming compressible flow. The distributions of temperature, velocity and static pressure within plasma plume under different Side gas flow conditions were calculated. The dynamic behaviour of the induced plasma in laser welding process was recorded with the aid of high-speed imaging. The results show that the Side assisting gas flow conditions, such as Side Nozzle height, Side assisting gas flow rate and the Side Nozzle inclination angle, can significantly affect the plasma plume characteristic, the coupling of laser energy into the workpiece and the resultant weld geometry. Modelling results concerning the influences of Side assisting gas on plasma characteristics are reasonably consistent with experiment results.

Yong Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Plasma behavior and control with small diameter assisting gas Nozzle during CO2 laser welding
    Journal of Materials Processing Technology, 2016
    Co-Authors: Yong Zhao, Kaili Zhu, Qing Shang, Jian Huang, Dongjie Yang
    Abstract:

    Abstract The laser-induced plasma is an important physical phenomenon during the process of penetration welding with high-power CO 2 laser. To study the effect of assisting gas in the laser-induced plasma behavior and characteristics of weld formation, different configurations of heat input and Side assisting gas were arranged to investigate the plasma behavior, and plasma images were recorded using high speed camera. By analyzing plasma images, spectrum intensity, and static pressure, the results have showed that the application of Side assisting gas suppresses the laser-induced plasma significantly and improves the utilization of laser power, in which a sound weld quality is obtained. The combination of Side Nozzle used in the study with a gas flow rate around 20 L/min, the mixed gas composed of helium and argon in which helium accounted for 75%, and the position of Side Nozzle in which x and y were set at around 0 mm, h was set at around 6 mm could bring good controlling effect on plasma and well weld seam profile as well as deeper penetration. The reference value provides a promising solution to improve the absorption and efficiency of laser power during CO 2 laser welding using Side assisting gas.

Linjie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Numerical and experimental study of the effect of Side assisting gas during laser welding
    Modelling and Simulation in Materials Science and Engineering, 2006
    Co-Authors: Linjie Zhang, Jianxun Zhang, A Q Duan, S L Gong
    Abstract:

    The influences of Side assisting gas flow conditions on the behaviour of laser induced plasma during laser welding process were studied using a two-dimensional model assuming compressible flow. The distributions of temperature, velocity and static pressure within plasma plume under different Side gas flow conditions were calculated. The dynamic behaviour of the induced plasma in laser welding process was recorded with the aid of high-speed imaging. The results show that the Side assisting gas flow conditions, such as Side Nozzle height, Side assisting gas flow rate and the Side Nozzle inclination angle, can significantly affect the plasma plume characteristic, the coupling of laser energy into the workpiece and the resultant weld geometry. Modelling results concerning the influences of Side assisting gas on plasma characteristics are reasonably consistent with experiment results.

Hou Hui - One of the best experts on this subject based on the ideXlab platform.

  • Design of a Micro Side Nozzle Piezoelectric Synthetic Jet
    Aviation Precision Manufacturing Technology, 2012
    Co-Authors: Hou Hui
    Abstract:

    A micro piezoelectric synthetic jet actuator with Side Nozzle is designed,and the momentum coefficient is selected as an important design parameter of synthetic jet actuator.The jet velocity of different structure sizes of Nozzle were calculated,and the Nozzle width influence on momentum coefficient was analyzed.Based on these,the optimal size range of the Nozzle were determined.The numerical simulation results of NACA0015 airfoil with 23° attack angle showed that the micro piezoelectric synthetic jet suppress flow separation of the boundary layer effectively.The fabrication process of this kind of actuator was proposed,and the prototype device was obtained.