1969 Volume 38 Issue 1 Pages 55-64
Relating to cutting oxygen pressure P0 and maximum cutting thickness Tm, cutting tests were made using several kinds of nozzles with the following results.
a) In case of applying proper pressure on divergent nozzle, Tm is increased with an increasing P0, and the increasing degree of Tm is in proportion to oxygen energy density at nozzle exit.
b) In case of applying excess pressure on both straight bore and divergent nozzle, Tm reaches a limit value with an increasing P0, and the limit value of Tm depends on design of nozzle.
c) Occurrence of shock wave in the oxygen jet with excess pressure is a cause of existence of the limit value of Tm.
d) Greater limit value of Tm is obtained with oxygen curtain nozzle than with conventional nozzle. The function of the shock wave in the cutting phenomena is discussed and made clear.