IMPROVED FLAME-CUTTING ECONOMY BY USING NOZZLES WITH INCREASED CUTTING-OXYGEN PRESSURE

Economy in flame-cutting depends largely on cutting speed, but methods developed in recent years to increase the speed have disadvantages such as higher oxygen consumption and suitability only for straight cuts. A further method for increasing the cutting speed is to raise the cutting-oxygen pressure, and this concept has been embodied in a nozzle which has been developed for a cutting-oxygen pressure of 20 bars. The Author explains the principles on which this new nozzle is based, describes its construction, and discusses its characteristics and economic performance on the basis of initial practical experience with it. Compared with the usual nozzles (which use pressures of 2 to 8 bars, depending on the thickness of the workpiece), the new nozzle increases cutting speed by 15 to 20%, or by 30% in some cases; a cut up to 30% finer is obtained. Gas consumption per unit length of cut is decreased, and it is calculated that, depending on circumstances, the 20-bar nozzle can save between 10 and 15% in the cost per unit length of cut. Existing cutting-machines can be adapted to use the new nozzle; for hole-piercing, special equipment has been developed. The Author mentions that, if pressures higher than 20 bars are to be considered for future flame-cutting machines, safety matters will need to be studied and new equipment developed and tested. Pressures below 20 bars are also of interest and tests need to be made to establish the minimum gas-pressure for which the new nozzle is suitable; first test in the laboratory indicate cutting-speed improvements of about 10% at 14 and 16 bars.

  • Corporate Authors:

    Deutscher Verlag fuer Schweisstechnik GmbH

    Schadowstrasse 42
    4 Dusseldorf,   Germany 
  • Authors:
    • Gorde, W
  • Publication Date: 1977-12

Language

  • German

Media Info

  • Features: References;
  • Pagination: 2 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00178294
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM