ＣＯ２レーザ溶接における吹付ガスの役割

• 丸尾 大

  大阪大学工学部

• 宮本 勇

  大阪大学工学部

• 荒田 吉明

  大阪大学溶接工学研究所

書誌事項

タイトル別名

• The role of assist gas in CO2 laser welding.
• Laser Welding of Metal (Rept.3)
• 金属材料のレーザ溶接(第3報)

抄録

Optimum gas-assisting parameters have been determined to suppress plasma formation, and the role of the assist gas has been analized in CO₂ laser welding. Results obtained are summarized as follows:<BR>(1) When the assist-gas pressure p is higher than p_p, which is slightly higher than vapor pressure or surface tension pressure the plasma formation is suppressed by forcing the vapor stream going up along the laser beam axis to eject along the rear wall of the cavity, providing increased penetration depth without weld defects. The value p_p decreases with increasing laser power and decreasing welding speed. The fluctuation of the penetration depth tends to increase with increasing p, since the cavity diameter is enlarged by the vapor pressure which exeeds the value for the surface tension pressure to keep the cavity stable.<BR>(2) When p is too high, a lot of molten metal flowed out of the cavity closes the cavity entrance on re-entering into the cavity due to its large mass motion, providing humping bead containing large porosities.<BR>(3) The plasma formation is also suppressed effectively at vacuum pressure range 10-20 torr, providing deeper penetration depth without fluctuation of the penetration.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 3 (2), 276-283, 1985

  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: 1390001204723305472
• NII論文ID: 130003764731
• DOI: 10.2207/qjjws.3.276
• COI: 1:CAS:528:DyaL2MXkt1GlsLk%3D
• ISSN: 24348252
• ISSN: 02884771
• ISSN: http://id.crossref.org/issn/02884771
• 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