ＭＩＧパルスアーク溶接におけるアーク長のサンプル値制御

• 大嶋 健司

  京都大学

• 安陪 稔

  京都大学

• 窪田 武文

  姫路工業大学

書誌事項

タイトル別名

• Sampled-Data Control of Arc Length in MIG Pulsed Arc Welding

抄録

A computer controlled system is proposed for improving the stability of the pulsed arc in a constant wire feed rate system. The pulsed current transfer is achieved by pulsing the current between the globular and spray transfer current ranges. In the pulse durations the current conduction occurs over the whole metal drop surface through the plasma, and promotes the magnetic force field conducive to the spray transfer. When the pulse durations are long, a few droplets may successively be detached from the electrode. Drops should be ejected one by one from the electrode tip at a regular frequency synchronizing with the frequency of current pulses, in order to improve the stability of the pulsed current transfer with a sufficiently short arc. For this purpose, the saw tooth current is used in the pulse peak current range.<BR>The voltage drop at the electrode extension is dependent upon Ohm's law and will be greater with long electrode extensions. Hence, even if the voltage at the point of current pickup is kept constant, the arc voltage or arc length varies with a variation in the current and electrode extension. A sampled-data control system computes the arc length in process of the arc welding by using the current and voltage at the point of current pickup, and determines the current magnitude on each cycle of pulsating current to keep the arc length constant.<BR>The behavior of the arc welding system is described by difference equations. The stability of the arc is discussed by studying the solution in the transient state.<BR>Experiments are also carried out in the sampled-data control system which contains transistors and integrated circuits, and the metal transfer and arc phenomena are observed by means of the high speed motion pictures. The validity of the theoretical results is confirmed by the experimental investigations.

収録刊行物

• 溶接学会誌

  溶接学会誌 51 (8), 700-707, 1982

  一般社団法人 溶接学会

キーワード

• Metals and Alloys
• Surfaces, Coatings and Films
• Mechanical Engineering
• Mechanics of Materials

詳細情報

• CRID: 1390282681475746944
• NII論文ID: 130003763651
• DOI: 10.2207/qjjws1943.51.700
• ISSN: 18837204
• ISSN: 00214787
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可