TW2-TVV/EBROOT: Controlling root welding made by electron beam with adaptive system

Miikka Karhu, Tommi Jokinen, Veli Kujanpää

    Research output: Book/ReportReport

    Abstract

    During the work of this task, a closed loop feed-back control system was developed and connected to the EB-welding machine of VTT. Research and development procedure was dealt in two stages. At the first stage a proper measurement system was developed and built up. At that stage preliminary welding tests were carried out in order to plot sensitivity of the process and to get confirmation of functionality of the measurement system. The actions of the second stage were based on the promising results of preliminary welding tests carried out at the stage one. During the stage two, the measurement system was upgraded with building a closed loop adaptive control connection to the system. As a final part of stage two, bead-on-plate welding tests at flat position were carried out to clarify the performance and usability of the developed control system. The test pieces were austenitic stainless steel plates (thicknesses between 8 and 12mm) which thickness was whether linearly increased or decreased in ratio of 1:40 in the middle part of the test piece. An increment and a decrement of thickness was chosen to be altered within 2 mm, which will simulate possible thickness alteration of the root face, resulted from manufacturing of very large-size work piece. As a whole, the carried welding tests gave promising results on the functionality of the control system, as well as the applicability of the concept itself. Some further work is recommended though, mainly concerning the improvement of reliability of the system and welding experiments with a longer weld length and at different welding positions.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages27
    Publication statusPublished - 2004
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Research Report
    NumberBTUO25-041257

    Fingerprint

    Adaptive systems
    Electron beams
    Welding
    Control systems
    Welding machines
    Austenitic stainless steel
    Feedback control
    Welds
    Experiments

    Keywords

    • electron beam
    • welding
    • root side
    • through-current
    • adaptive
    • control system

    Cite this

    Karhu, M., Jokinen, T., & Kujanpää, V. (2004). TW2-TVV/EBROOT: Controlling root welding made by electron beam with adaptive system. VTT Technical Research Centre of Finland. VTT Research Report, No. BTUO25-041257
    Karhu, Miikka ; Jokinen, Tommi ; Kujanpää, Veli. / TW2-TVV/EBROOT : Controlling root welding made by electron beam with adaptive system. VTT Technical Research Centre of Finland, 2004. 27 p. (VTT Research Report; No. BTUO25-041257).
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    Karhu, M, Jokinen, T & Kujanpää, V 2004, TW2-TVV/EBROOT: Controlling root welding made by electron beam with adaptive system. VTT Research Report, no. BTUO25-041257, VTT Technical Research Centre of Finland.

    TW2-TVV/EBROOT : Controlling root welding made by electron beam with adaptive system. / Karhu, Miikka; Jokinen, Tommi; Kujanpää, Veli.

    VTT Technical Research Centre of Finland, 2004. 27 p. (VTT Research Report; No. BTUO25-041257).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - TW2-TVV/EBROOT

    T2 - Controlling root welding made by electron beam with adaptive system

    AU - Karhu, Miikka

    AU - Jokinen, Tommi

    AU - Kujanpää, Veli

    PY - 2004

    Y1 - 2004

    N2 - During the work of this task, a closed loop feed-back control system was developed and connected to the EB-welding machine of VTT. Research and development procedure was dealt in two stages. At the first stage a proper measurement system was developed and built up. At that stage preliminary welding tests were carried out in order to plot sensitivity of the process and to get confirmation of functionality of the measurement system. The actions of the second stage were based on the promising results of preliminary welding tests carried out at the stage one. During the stage two, the measurement system was upgraded with building a closed loop adaptive control connection to the system. As a final part of stage two, bead-on-plate welding tests at flat position were carried out to clarify the performance and usability of the developed control system. The test pieces were austenitic stainless steel plates (thicknesses between 8 and 12mm) which thickness was whether linearly increased or decreased in ratio of 1:40 in the middle part of the test piece. An increment and a decrement of thickness was chosen to be altered within 2 mm, which will simulate possible thickness alteration of the root face, resulted from manufacturing of very large-size work piece. As a whole, the carried welding tests gave promising results on the functionality of the control system, as well as the applicability of the concept itself. Some further work is recommended though, mainly concerning the improvement of reliability of the system and welding experiments with a longer weld length and at different welding positions.

    AB - During the work of this task, a closed loop feed-back control system was developed and connected to the EB-welding machine of VTT. Research and development procedure was dealt in two stages. At the first stage a proper measurement system was developed and built up. At that stage preliminary welding tests were carried out in order to plot sensitivity of the process and to get confirmation of functionality of the measurement system. The actions of the second stage were based on the promising results of preliminary welding tests carried out at the stage one. During the stage two, the measurement system was upgraded with building a closed loop adaptive control connection to the system. As a final part of stage two, bead-on-plate welding tests at flat position were carried out to clarify the performance and usability of the developed control system. The test pieces were austenitic stainless steel plates (thicknesses between 8 and 12mm) which thickness was whether linearly increased or decreased in ratio of 1:40 in the middle part of the test piece. An increment and a decrement of thickness was chosen to be altered within 2 mm, which will simulate possible thickness alteration of the root face, resulted from manufacturing of very large-size work piece. As a whole, the carried welding tests gave promising results on the functionality of the control system, as well as the applicability of the concept itself. Some further work is recommended though, mainly concerning the improvement of reliability of the system and welding experiments with a longer weld length and at different welding positions.

    KW - electron beam

    KW - welding

    KW - root side

    KW - through-current

    KW - adaptive

    KW - control system

    M3 - Report

    T3 - VTT Research Report

    BT - TW2-TVV/EBROOT

    PB - VTT Technical Research Centre of Finland

    ER -

    Karhu M, Jokinen T, Kujanpää V. TW2-TVV/EBROOT: Controlling root welding made by electron beam with adaptive system. VTT Technical Research Centre of Finland, 2004. 27 p. (VTT Research Report; No. BTUO25-041257).