The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

N E Kirk - One of the best experts on this subject based on the ideXlab platform.

  • the static strength of end and t Fillet Weld connections
    Materials & Design, 1999
    Co-Authors: B G Mellor, R C T Rainey, N E Kirk
    Abstract:

    Abstract The ultimate strength of Fillet Welded joints is of vital importance when analysing the collapse behaviour of a Welded structure. However, both the small size and difficulties in determining accurately, for the different regions of the Weld, relevant material properties to input in a finite element analysis complicates modelling. Hence the strength of Fillet Welds forming lap (cover plate) and cruciform (T) joints has been analysed by reviewing the various empirical relationships, based on both experimental and theoretical treatments, proposed in the literature. These results are compared with the strength of Fillet Welds predicted by different design codes, and are used to establish the correct materials parameters for input to a finite element model of a Welded T joint analysed by the finite element program DYNA 3D.

Jian Le - One of the best experts on this subject based on the ideXlab platform.

  • Realization of rectangular Fillet Weld tracking based on rotating arc sensors and analysis of experimental results in gas metal arc Welding
    Robotics and Computer-Integrated Manufacturing, 2018
    Co-Authors: Jian Le, Hua Zhang, Xiao Qi Chen
    Abstract:

    In order to improve the Welding quality and efficiency of the rectangular Fillet Weld in the shipyard and the steel structure workshop, reduce the labor cost, and improve the Welding automation, it is necessary to study a Welding robot that can track rectangular Fillet Weld. The working principle of the rotating arc sensor has been studied, and the mathematical model of the space posture of the arc Welding gun has been established. The equivalent link coordinate systems of the wheeled mobile robot have been built, and the jacobian matrix of the robot and its inverse matrix have been calculated. The transformation from the operational space speed to the joint space speed has been realized by using the inverse matrix of the jacobian matrix, and the trajectory planning of the Welding robot has been finished. The tracking algorithms of the linear Fillet Weld and the rectangular Fillet Weld have been studied, and the rectangular Fillet Weld tracking experiment has been done in the laboratory and the factory. Experimental results showed that the Welding robot can track the rectangular Fillet Weld with high accuracy and good reliability.

  • Rectangular Fillet Weld tracking by robots based on rotating arc sensors in gas metal arc Welding
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Xiao Qi Chen, Hua Zhang, Xiong
    Abstract:

    There are lots of rectangular Fillet Welds in the shipyard, and it is mainly Welded by manual Welding with low accuracy and poor reliability, so it is necessary to study a Welding robot that can accurately track the rectangular Fillet Weld. Firstly, the mathematical model of the space posture of the arc Welding gun has been established, path planning of the rotation of the Welding robot has been studied when the Welding robot tracks the linear Fillet Weld, and the inclination angle of the arc Welding gun has been identified. Secondly, the control algorithm of the linear Fillet Weld tracking has been studied, and the tracking algorithm of the rectangular Fillet Weld has been researched. Finally, the tracking experiment of the rectangular Fillet Weld has been done in the laboratory and the shipyard. Experimental results showed that Welding accuracy and reliability could be improved by using robotic Welding instead of manual Welding.

  • right angle Fillet Weld tracking by robots based on rotating arc sensors in gmaw
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Hua Zhang, Xiao Qi Chen
    Abstract:

    In order to improve the quality and the efficiency of Welding right-angle Fillet Weld, reduce the labor intensity of workers, it is necessary to research the tracking algorithm of right-angle Fillet Weld. The mathematical model of the space posture of the arc Welding gun was established, and the recognition algorithm of the inclination angle of the arc Welding gun was designed. When the Welding robot was Welding right-angle Fillet Weld, the path planning of the robot was studied. By using the method of pattern recognition, the cross point of right-angle Fillet Weld was identified accurately. The realization algorithm of right-angle Fillet Weld tracking was studied, and the Welding speed was a constant. Tracking experiment of right-angle Fillet Weld was done in the laboratory and shipyard, and experimental results showed that the robot could track right-angle Fillet Weld with high accuracy and good reliability by using the designed algorithm.

  • circular Fillet Weld tracking in gmaw by robots based on rotating arc sensors
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Hua Zhang, Yong Xiao
    Abstract:

    In order to reduce the Welding cost, improve the Welding quality, and enhance the automation level of the Welding, the circular Fillet Weld tracking algorithm was studied based on the coordinated movement between wheels and a horizontal slider, and the tracking algorithm can eliminate the impact on the Welding quality due to roundness errors of the circular Fillet Weld in the plane. Furthermore, the circular Fillet Weld tracking algorithm was studied based on the vertical slider moving up or down, and this algorithm can eliminate the influence on the Welding quality due to flatness errors of the circular Fillet Weld in the vertical direction. By using the circular Fillet Weld tracking algorithm that robots track the circular Fillet Weld based on the coordinated movement among wheels, the vertical and horizontal sliders, a large number of experiments have been done in the laboratory and the factory. For example, robots tracked the circular Fillet Weld with different diameters in the laboratory, and the circular Fillet Weld of the flat bottom container was tracked by robots in the factory. At last, the deviation that the arc Welding gun deviated from the Weld seam was analyzed, and the experimental results show that the robot based on the rotating arc sensor can track the circular Fillet Weld with high accuracy and good reliability by using the designed algorithm in gas metal arc Welding.

  • Rectangular Fillet Weld tracking by robots based on rotating arc sensors in gas metal arc Welding
    International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Xiao Qi Chen, Hua Zhang, Gen Xiong
    Abstract:

    In order to reduce the Welding cost, improve the Welding quality, and enhance the automation level of the Welding, the circular Fillet Weld tracking algorithm was studied based on the coordinated movement between wheels and a horizontal slider, and the tracking algorithm can eliminate the impact on the Welding quality due to roundness errors of the circular Fillet Weld in the plane. Furthermore, the circular Fillet Weld tracking algorithm was studied based on the vertical slider moving up or down, and this algorithm can eliminate the influence on the Welding quality due to flatness errors of the circular Fillet Weld in the vertical direction. By using the circular Fillet Weld tracking algorithm that robots track the circular Fillet Weld based on the coordinated movement among wheels, the vertical and horizontal sliders, a large number of experiments have been done in the laboratory and the factory. For example, robots tracked the circular Fillet Weld with different diameters in the laboratory, and the circular Fillet Weld of the flat bottom container was tracked by robots in the factory. At last, the deviation that the arc Welding gun deviated from the Weld seam was analyzed, and the experimental results show that the robot based on the rotating arc sensor can track the circular Fillet Weld with high accuracy and good reliability by using the designed algorithm in gas metal arc Welding.

B G Mellor - One of the best experts on this subject based on the ideXlab platform.

  • the static strength of end and t Fillet Weld connections
    Materials & Design, 1999
    Co-Authors: B G Mellor, R C T Rainey, N E Kirk
    Abstract:

    Abstract The ultimate strength of Fillet Welded joints is of vital importance when analysing the collapse behaviour of a Welded structure. However, both the small size and difficulties in determining accurately, for the different regions of the Weld, relevant material properties to input in a finite element analysis complicates modelling. Hence the strength of Fillet Welds forming lap (cover plate) and cruciform (T) joints has been analysed by reviewing the various empirical relationships, based on both experimental and theoretical treatments, proposed in the literature. These results are compared with the strength of Fillet Welds predicted by different design codes, and are used to establish the correct materials parameters for input to a finite element model of a Welded T joint analysed by the finite element program DYNA 3D.

Timo Bjork - One of the best experts on this subject based on the ideXlab platform.

  • fatigue strength of tig dressed ultra high strength steel Fillet Weld joints at high stress ratio
    International Journal of Fatigue, 2017
    Co-Authors: Tuomas Skriko, M Ghafouri, Timo Bjork
    Abstract:

    Abstract The effect of stress ratio on the fatigue strength of TIG-dressed Fillet Weld joints of S960 grade steel was studied by experimental testing, and statistical analyses using finite element (FE) modeling were performed to define geometric parameters and their effect on the stress concentration factor of the TIG-dressed Fillet Weld joints. Review of the literature and scientific publications indicated a need for studies related to both the fatigue durability of TIG-dressed ultra-high-strength steel (UHSS) Weldments and the fatigue strength of these joints at high stress ratio. The results of the experimental fatigue tests showed that International Institute of Welding recommendations accounting for the effects of TIG-dressing on fatigue classes are too conservative for S960 grade steel, although the fatigue resistance of TIG-dressed UHSS Fillet Weld joints was found to decrease with increasing stress ratio. Statistical analysis of geometric variables and FE modeling with an idealized Weld profile shape showed that toe radius and Weld undercut have the greatest effect on stress concentration in TIG-dressed Fillet Weld joints. In addition, TIG-dressing was found to cause notable softening in the fusion line and heat affected zone of the TIG-dressed S960 Weldments, which might have an effect on fatigue crack initiation and thus the fatigue strength of the structure.

Xiao Qi Chen - One of the best experts on this subject based on the ideXlab platform.

  • Realization of rectangular Fillet Weld tracking based on rotating arc sensors and analysis of experimental results in gas metal arc Welding
    Robotics and Computer-Integrated Manufacturing, 2018
    Co-Authors: Jian Le, Hua Zhang, Xiao Qi Chen
    Abstract:

    In order to improve the Welding quality and efficiency of the rectangular Fillet Weld in the shipyard and the steel structure workshop, reduce the labor cost, and improve the Welding automation, it is necessary to study a Welding robot that can track rectangular Fillet Weld. The working principle of the rotating arc sensor has been studied, and the mathematical model of the space posture of the arc Welding gun has been established. The equivalent link coordinate systems of the wheeled mobile robot have been built, and the jacobian matrix of the robot and its inverse matrix have been calculated. The transformation from the operational space speed to the joint space speed has been realized by using the inverse matrix of the jacobian matrix, and the trajectory planning of the Welding robot has been finished. The tracking algorithms of the linear Fillet Weld and the rectangular Fillet Weld have been studied, and the rectangular Fillet Weld tracking experiment has been done in the laboratory and the factory. Experimental results showed that the Welding robot can track the rectangular Fillet Weld with high accuracy and good reliability.

  • Rectangular Fillet Weld tracking by robots based on rotating arc sensors in gas metal arc Welding
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Xiao Qi Chen, Hua Zhang, Xiong
    Abstract:

    There are lots of rectangular Fillet Welds in the shipyard, and it is mainly Welded by manual Welding with low accuracy and poor reliability, so it is necessary to study a Welding robot that can accurately track the rectangular Fillet Weld. Firstly, the mathematical model of the space posture of the arc Welding gun has been established, path planning of the rotation of the Welding robot has been studied when the Welding robot tracks the linear Fillet Weld, and the inclination angle of the arc Welding gun has been identified. Secondly, the control algorithm of the linear Fillet Weld tracking has been studied, and the tracking algorithm of the rectangular Fillet Weld has been researched. Finally, the tracking experiment of the rectangular Fillet Weld has been done in the laboratory and the shipyard. Experimental results showed that Welding accuracy and reliability could be improved by using robotic Welding instead of manual Welding.

  • right angle Fillet Weld tracking by robots based on rotating arc sensors in gmaw
    The International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Hua Zhang, Xiao Qi Chen
    Abstract:

    In order to improve the quality and the efficiency of Welding right-angle Fillet Weld, reduce the labor intensity of workers, it is necessary to research the tracking algorithm of right-angle Fillet Weld. The mathematical model of the space posture of the arc Welding gun was established, and the recognition algorithm of the inclination angle of the arc Welding gun was designed. When the Welding robot was Welding right-angle Fillet Weld, the path planning of the robot was studied. By using the method of pattern recognition, the cross point of right-angle Fillet Weld was identified accurately. The realization algorithm of right-angle Fillet Weld tracking was studied, and the Welding speed was a constant. Tracking experiment of right-angle Fillet Weld was done in the laboratory and shipyard, and experimental results showed that the robot could track right-angle Fillet Weld with high accuracy and good reliability by using the designed algorithm.

  • Rectangular Fillet Weld tracking by robots based on rotating arc sensors in gas metal arc Welding
    International Journal of Advanced Manufacturing Technology, 2017
    Co-Authors: Jian Le, Xiao Qi Chen, Hua Zhang, Gen Xiong
    Abstract:

    In order to reduce the Welding cost, improve the Welding quality, and enhance the automation level of the Welding, the circular Fillet Weld tracking algorithm was studied based on the coordinated movement between wheels and a horizontal slider, and the tracking algorithm can eliminate the impact on the Welding quality due to roundness errors of the circular Fillet Weld in the plane. Furthermore, the circular Fillet Weld tracking algorithm was studied based on the vertical slider moving up or down, and this algorithm can eliminate the influence on the Welding quality due to flatness errors of the circular Fillet Weld in the vertical direction. By using the circular Fillet Weld tracking algorithm that robots track the circular Fillet Weld based on the coordinated movement among wheels, the vertical and horizontal sliders, a large number of experiments have been done in the laboratory and the factory. For example, robots tracked the circular Fillet Weld with different diameters in the laboratory, and the circular Fillet Weld of the flat bottom container was tracked by robots in the factory. At last, the deviation that the arc Welding gun deviated from the Weld seam was analyzed, and the experimental results show that the robot based on the rotating arc sensor can track the circular Fillet Weld with high accuracy and good reliability by using the designed algorithm in gas metal arc Welding.