1987 Volume 5 Issue 2 Pages 224-229
It was previously reported that the maximum cut thickness (Tm) obtained in underwater gas cutting in the flat position was remarkably smaller than that in air, especially by using a large diameter-tip. It was considered that this -was caused by the difference of the state of oxygen jets in the kerf in underwater or in·air cutting process. In this report, underwater gas cuttings by such three cutting positions as the vertical up, the vertical down and the horizontal position were carried out to make clear the phenomena in underwater gas cutting, from the view point of the maximum cut thickness.
The results obtained are summarized as follows;
(1) The value of Tm obtained in underwater gas cutting was affected with the cutting position. The Tin obtained in the vertical down position by using the large diameter-tip was smaller than those of the vertical up and horizontal position.
(2) It was cleared. that the state of oxygen jets was influenced by the direction, the width, and the shape of the kerf, and this caused the difference of the Tm in various cutting positions.
(3) Unstable phenomena were observed in oxygen flow in the kerf model of acrylic resin in the vertical down position. In actual cutting, the unstable exclusion of slag was observed and the cutting surface was disturbed.