Relating to cutting oxygen pressure P
0 and maximum cutting thickness T
m, cutting tests were made using several kinds of nozzles with the following results.
a) In case of applying proper pressure on divergent nozzle, T
m is increased with an increasing P
0, and the increasing degree of T
m is in proportion to oxygen energy density at nozzle exit.
b) In case of applying excess pressure on both straight bore and divergent nozzle, T
m reaches a limit value with an increasing P
0, and the limit value of T
m 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 T
m 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.
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