The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform

Yoshinori Hirata - One of the best experts on this subject based on the ideXlab platform.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Welding International, 2013
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short-circuit current to a low level just before the re-arcing. The reduction in spatter requires an improvement in the accuracy of predicting the re-arcing by stabilizing the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimizes the accuracy of predicting the re-arcing in real time in response to the metal transfer, realizes spatter reduction and stable arc in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extra-thin steel sheets, specifically those thinner than 1.0 mm. With electrode negative (EN) CBT process, although slight arc voltage fluctuation occurs caused by the behaviour of cathode spots on the tip of the wire during EN polarity GMAW, instantaneous voltage uses command computation to improve the transient response against the disturbance. C...

  • Spatter reduction in gas metal arc welding of stainless steel sheets using Controlled Bridge transfer process
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Tomoyuki Ueyama, Yoshinori Hirata
    Abstract:

    Abstract In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by controlling the short circuit current to a low level just before the re-arcing. The Controlled Bridge transfer (CBT) process, which optimises the accuracy of predicting the re-arcing in real time in response to the metal transfer, realises stable, low spatter level. In this research, the methods for controlling short circuit transfers to minimise spatter and realise stable arcs in GMAW of stainless sheet using argon rich shielded gases are investigated. The new CBT process has been developed by applying the specific arc length estimation method that is not affected by abnormal rise in arc voltage. This process can suppress the spatter generation caused by a fluctuation in the vibratory motion of the weld pool or inaccurate prediction of the re-arcing in the succeeding short circuit/re-arcing cycle, and thereby spatter free GMAW in the short circuit transfer mode can be carried out even on stainless steels.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    AbstractIn non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short circuit current to a low level just before the rearcing period. The reduction of spatter requires an improvement in the accuracy of predicting the rearcing by stabilising the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimises the accuracy of predicting the rearcing in real time in response to the metal transfer, in order to realise spatter reduction and stable arcs in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extrathin steel sheets, specifically those thinner than 1·0 mm. With an electrode negative (EN) CBT process, although some slight arc voltage fluctuation occurs caused by the behaviour of the cathode spots on the tip of the wire during in EN polarity GMAW, instantaneous voltage is used, through a command computation, to impr...

Tetsuo Era - One of the best experts on this subject based on the ideXlab platform.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Welding International, 2013
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short-circuit current to a low level just before the re-arcing. The reduction in spatter requires an improvement in the accuracy of predicting the re-arcing by stabilizing the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimizes the accuracy of predicting the re-arcing in real time in response to the metal transfer, realizes spatter reduction and stable arc in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extra-thin steel sheets, specifically those thinner than 1.0 mm. With electrode negative (EN) CBT process, although slight arc voltage fluctuation occurs caused by the behaviour of cathode spots on the tip of the wire during EN polarity GMAW, instantaneous voltage uses command computation to improve the transient response against the disturbance. C...

  • Spatter reduction in gas metal arc welding of stainless steel sheets using Controlled Bridge transfer process
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Tomoyuki Ueyama, Yoshinori Hirata
    Abstract:

    Abstract In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by controlling the short circuit current to a low level just before the re-arcing. The Controlled Bridge transfer (CBT) process, which optimises the accuracy of predicting the re-arcing in real time in response to the metal transfer, realises stable, low spatter level. In this research, the methods for controlling short circuit transfers to minimise spatter and realise stable arcs in GMAW of stainless sheet using argon rich shielded gases are investigated. The new CBT process has been developed by applying the specific arc length estimation method that is not affected by abnormal rise in arc voltage. This process can suppress the spatter generation caused by a fluctuation in the vibratory motion of the weld pool or inaccurate prediction of the re-arcing in the succeeding short circuit/re-arcing cycle, and thereby spatter free GMAW in the short circuit transfer mode can be carried out even on stainless steels.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    AbstractIn non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short circuit current to a low level just before the rearcing period. The reduction of spatter requires an improvement in the accuracy of predicting the rearcing by stabilising the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimises the accuracy of predicting the rearcing in real time in response to the metal transfer, in order to realise spatter reduction and stable arcs in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extrathin steel sheets, specifically those thinner than 1·0 mm. With an electrode negative (EN) CBT process, although some slight arc voltage fluctuation occurs caused by the behaviour of the cathode spots on the tip of the wire during in EN polarity GMAW, instantaneous voltage is used, through a command computation, to impr...

  • Spatter Reduction of Steel Sheets Welding Using Controlled Bridge Transfer (CBT) GMA Process
    Materials Science Forum, 2008
    Co-Authors: Tetsuo Era, Akihiro Ide, Toshiro Uezono, Tomoyuki Ueyama
    Abstract:

    In non-pulsed GMA welding, spatter can be reduced by controlling the short-circuit current to a low level just before the re-arcing. The reduction of spatter requires improving the accuracy of predicting the re-arcing by stabilizing the molten metal transfer, and improving the consistency of accuracy against disturbances. The Controlled Bridge Transfer (CBT) process, which optimizes the accuracy of predicting the re-arcing in real time in response to the molten metal transfer, realizes stable, low spatter level GMA welding.

Tomoyuki Ueyama - One of the best experts on this subject based on the ideXlab platform.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Welding International, 2013
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short-circuit current to a low level just before the re-arcing. The reduction in spatter requires an improvement in the accuracy of predicting the re-arcing by stabilizing the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimizes the accuracy of predicting the re-arcing in real time in response to the metal transfer, realizes spatter reduction and stable arc in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extra-thin steel sheets, specifically those thinner than 1.0 mm. With electrode negative (EN) CBT process, although slight arc voltage fluctuation occurs caused by the behaviour of cathode spots on the tip of the wire during EN polarity GMAW, instantaneous voltage uses command computation to improve the transient response against the disturbance. C...

  • Spatter reduction in gas metal arc welding of stainless steel sheets using Controlled Bridge transfer process
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Tomoyuki Ueyama, Yoshinori Hirata
    Abstract:

    Abstract In non-pulsed gas metal arc welding (GMAW), spatter can be reduced by controlling the short circuit current to a low level just before the re-arcing. The Controlled Bridge transfer (CBT) process, which optimises the accuracy of predicting the re-arcing in real time in response to the metal transfer, realises stable, low spatter level. In this research, the methods for controlling short circuit transfers to minimise spatter and realise stable arcs in GMAW of stainless sheet using argon rich shielded gases are investigated. The new CBT process has been developed by applying the specific arc length estimation method that is not affected by abnormal rise in arc voltage. This process can suppress the spatter generation caused by a fluctuation in the vibratory motion of the weld pool or inaccurate prediction of the re-arcing in the succeeding short circuit/re-arcing cycle, and thereby spatter free GMAW in the short circuit transfer mode can be carried out even on stainless steels.

  • Controlled Bridge transfer (CBT) gas metal arc process for steel sheets joining
    Science and Technology of Welding and Joining, 2009
    Co-Authors: Tetsuo Era, Toshiro Uezono, Tomoyuki Ueyama, Akinobu Ide, Yoshinori Hirata
    Abstract:

    AbstractIn non-pulsed gas metal arc welding (GMAW), spatter can be reduced by lowering the short circuit current to a low level just before the rearcing period. The reduction of spatter requires an improvement in the accuracy of predicting the rearcing by stabilising the metal transfer and improving the robustness of the accuracy against disturbances. The Controlled Bridge transfer (CBT) process optimises the accuracy of predicting the rearcing in real time in response to the metal transfer, in order to realise spatter reduction and stable arcs in non-pulsed GMAW. Traditionally, GMAW is carried out using electrode positive polarity. However, this polarity is not sufficient for welding extrathin steel sheets, specifically those thinner than 1·0 mm. With an electrode negative (EN) CBT process, although some slight arc voltage fluctuation occurs caused by the behaviour of the cathode spots on the tip of the wire during in EN polarity GMAW, instantaneous voltage is used, through a command computation, to impr...

  • Spatter Reduction of Steel Sheets Welding Using Controlled Bridge Transfer (CBT) GMA Process
    Materials Science Forum, 2008
    Co-Authors: Tetsuo Era, Akihiro Ide, Toshiro Uezono, Tomoyuki Ueyama
    Abstract:

    In non-pulsed GMA welding, spatter can be reduced by controlling the short-circuit current to a low level just before the re-arcing. The reduction of spatter requires improving the accuracy of predicting the re-arcing by stabilizing the molten metal transfer, and improving the consistency of accuracy against disturbances. The Controlled Bridge Transfer (CBT) process, which optimizes the accuracy of predicting the re-arcing in real time in response to the molten metal transfer, realizes stable, low spatter level GMA welding.

R. Bonert - One of the best experts on this subject based on the ideXlab platform.

  • High Performance Single-Chip Gating Circuit for a Phase-Controlled Bridge
    IEEE Transactions on Industrial Electronics, 1994
    Co-Authors: Francis P. Dawson, R. Bonert
    Abstract:

    The increasing availability of single-chip low cost\nmicrocontrollers has made it possible to reconsider conventional\nhardware designs for a variety of gating circuits. This paper, in\nparticular, presents the design of a gating circuit for a six-pulse\nphase-Controlled Bridge utilizing a single-chip programmable\nmicrocontroller. The dynamic performance of the proposed gating circuit\nis similar to an analog circuit implementation. The resolution of the\nfiring angle is better than 0.1 degrees at 60 Hz. Moreover, the system\nis designed to operate over a frequency range of 3 Hz to 120 Hz, and to\nautomatically adapt to changes in line frequency. The experimental\nverification of the performance criteria are also presented. Finally, an\nexample of a special application for a dual-Bridge AC to DC converter is\npresented

Mohd. Hasan Ali - One of the best experts on this subject based on the ideXlab platform.

  • Transient stability enhancement of power grid by neural network Controlled BFCL considering cyber-attacks
    SoutheastCon 2017, 2017
    Co-Authors: Mohammad Ashraf Hossain Sadi, Huaxi Zheng, Mohd. Hasan Ali
    Abstract:

    In this paper, a neural network predictive Controlled Bridge type fault current limiter (FCL) is proposed to enhance the transient stability of power systems. Cyber security issues on the performance of neural network controller is also investigated. It is noteworthy that simulations have been conducted by the Matlab/Simulink software. Both symmetrical and unsymmetrical types of permanent and temporary faults have been considered at different locations of a multi-machine power system. Based on the simulation results, it can be concluded that the Bridge type FCL based on neural network predictive controller can enhance the transient stability of the system well. Moreover, the cyber-attack has profound effect on the controller performance and the system becomes fully unstable even with the presence of the neural network predictive Controlled Bridge type FCL.

  • a fuzzy logic Controlled Bridge type fault current limiter for transient stability augmentation of multi machine power system
    Power and Energy Society General Meeting, 2016
    Co-Authors: Mohammad Ashraf Hossain Sadi, Mohd. Hasan Ali
    Abstract:

    This paper proposes a fuzzy logic Controlled Bridge type fault current limiter (FCL) to enhance the transient stability of multi-machine power systems. The transient stability performance of the fuzzy logic Controlled Bridge type FCL is compared with that of another static nonlinear Controlled Bridge type FCL. The total kinetic energy (TKE) of the generators in the system is used to determine the transient stability enhancement index. Also, the critical clearing time has been presented as a stability limit. Instead of conventional reclosing, the optimal reclosing of circuit breakers is considered. Simulations are performed by using the Matlab/Simulink software. Simulation results of both permanent and temporary faults at different points of the IEEE 30 bus power system indicate that the fuzzy logic Controlled Bridge type FCL can enhance the transient stability of the system well. Also, the performance of the proposed fuzzy logic controller is better than that of the static nonlinear controller.