Study on Gas Cutting Relating to Oxygen Pressure and Masimum Cutting Thickness

Abstract

Relating to cutting oxygen pressure P₀ 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 P₀, 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 P₀, 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.