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Experimental research of thermal processing phenomena by micro-arc

Research Project

Project/Area Number 10450271
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionOsaka University

Principal Investigator

HIRATA Yoshinori  Graduate School of Eng., Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (00116089)

Co-Investigator(Kenkyū-buntansha) URAGAKI Hiroshi  Faculty of Education, Kochi University, Professor, 教育学部, 教授 (10107138)
OHJI Takayoshi  Graduate School of Eng., Osaka University, Professor, 大学院・工学研究科, 教授 (00089880)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 1999: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1998: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsMicro-Arc / Electrical breakdown / Micro materials processing / Very small size welding / Tungsten cathode / Melting and evaporation process / グロー放電 / 微細加工 / アーク溶棲 / 溶融・蒸発現象 / アーク溶接
Research Abstract

The phenomena associated with micro-arc, which is struck in argon gas atmosphere in the gap between thin tungsten cathode and stainless steel plate anode, were experimentally investigated. The experimental setup, which is consisted of a micro-arc torch, precise positioning mechanisms actuated by piezoelectric devices and pulse motors, and a power supply for discharge, was constructed. Time-resolution of micro-discharge appearance was observed through microscope with high-speed shutter CCD camera. The results obtained are summarized as follows :
(1) Electrical breakdown voltage increases with increase of gap length beyond about 10μm. In the range of small gap length of a few micrometer, it requires almost constant voltage of 250-300 V independently of gap length. High intense luminous region of micro-arc is concentrated at the electrode tip in the early stage of the discharge and then expands with time.
(2) The size and/or the form of melting spot at anode surface by micro-arc depend mainly on gap length. Melting spot with flat surface having diameter of 5-10μm can be obtained by adjusting gap length, current level and pulse width.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] Hirata Y.: "Micro-Arc Discharge Phenomena"Vacuum. Vol.53(予定). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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