Abstract
As for oxygen impurities such as nitrogen, carbon dioxide and argon intentionally added to cutting oxygen, their effect on the cutting efficiency was investigated quantitatively at the early stage of this experiment and reported in an earlier paper of this series. The present paper reports the results of investigation made on the effect of the combustible gases, such as hydrogen and propane.
The results may be summarized as follows :
(1) When cuttig speed is lowered, cutting ability (the maximum cut thickness) generally increases until the speed falls to some specific level. However, when the speed fallsbelow this specific level, the cutting ability decreases rapidly.
(2) Combustible gas addition to oxygen seems to lower slightly such critical speed as above mentioned.
(3) Non-combustible gases have also a similar effect on the critical speed.
(4) Moreover, the addition of a small amount of these combustible or non-combustible gases to cutting oxygen enhances the cutting ability at slow cutting speed.
The results seem to have a close connection with the mechanism of cutting reaction itself, and the most reasonable explanation has been developed.
