Development of Automatic Beam Focus Detecting System for Electron Beam Welding

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Other Title
  • 電子ビーム溶接における焦点自動検出システムの開発

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Description

In electron beam welding, it is very important to set focal position of beam on work piece appropriately. However, it is very difficult to set one accurately in case of complex joint geometry. New beam focus detecting system have been developed as part of intelligent welding system for electron beam welding. When electron beam is irradiated on work poece, backscattered electron, thermoelectron, secondary electron, ion or X-ray emitted from work piece are observed. Among these, thermoelectron is much affected with surface condition of a work piece. That is, as soon as the surface melted, thermoelectron increased rapidly. The results obtained are as follows. 1. In case that the condition of beam convergency on work piece is shifted from out of focus to in focus, signal of thermoelectron shows peak value when beam focal position coincide with the surface of work piece. 2. It is possible to obtain high S/N ratio by employing positive collector bias by which thermoelectron gathered easily to the collector. 3. The detecting accuracy is within ±1% in the case that a_b factor is 1.0.

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Details 詳細情報について

  • CRID
    1572543027253635072
  • NII Article ID
    110003423656
  • NII Book ID
    AN1005067X
  • ISSN
    02884771
  • Text Lang
    ja
  • Data Source
    • CiNii Articles

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