下向姿勢における水中ガス切断現象

水中ガス切断の基礎的研究(第1報)

抄録

Characteristics of underwater gas cutting in the flat position, compared with gas cutting in air, were investigated from the viewpoint of cutting ability. This ability was estimated from the maximum cut thickness (Tm) of wedge-shaped specimen, and the relationship between Tm and velocity of cutting oxygen jet was inquired.
The results obtained are summarized as follows;
(1) When the proper cutting conditions employed in air were applied to underwater gas cutting, Tm was remarkably smaller than that in air, especially by using a large diameter-tip. And also, unstable phenomena were observed on cutting process and cut surface.
(2) By the increases in cutting oxygen pressure and preheating gas consumption, Tm was increased in the similar tendency as that in air. However, Tm was still smaller than that in air.
(3) It was known that Tm was influenced by the decrease of velocity of cutting oxygen jet in relation to tip diameter, cutting oxygen pressure and kerf width.