OXYGEN ASSISTED LASER CUTTING MECHANISM - A LAMINAR BOUNDARY-LAYER APPROACH INCLUDING THE COMBUSTION PROCESS

YILBAS B., SAHIN A. Z.

OPTICS AND LASER TECHNOLOGY, cilt.27, sa.3, ss.175-184, 1995 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 3
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0030-3992(95)93638-8
  • Dergi Adı: OPTICS AND LASER TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.175-184
  • Anahtar Kelimeler: LASER CUTTING, LASERS (CO2), OXYGEN ASSIST, SURFACE
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The present study examines the combined effects of chemical reactions taking place between a gas jet and molten metal, the cooling effect of the jet and the evaporation of metal, during a CO2 laser cutting process. A laminar boundary layer approach was used to develop a theoretical model for the oxygen gas jet laser cutting mechanism. An experiment was carried out to monitor the keyhole formation using a video recorder and detect the light emitted from the entrance and exist surfaces of the workpiece using a fibre-optic probe during the cutting process, The experimental study was extended to employ two different workpiece materials (stainless steel and mild steel) at two thicknesses, and varying oxygen assisting gas pressures. It is found that the theoretical model developed in the present study is valid for a cutting speed of about 30 mm s(-1) and all jet velocities up to sonic, since the effect of shock is excluded in the model.