Some Fundamental Research of New Type Powder Oxygen Cutting Method for Stainless Steel(WELDING PHYSICS, PROCESSES AND INSTRUMENTS)
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This investigation is carried out so that we clear the main action of iron powders on cutting of stainless steel, and obtain higher cutting efficiency. In this study, we adopted the new type cutting method, in which the iron powders are aspirated into cutting oxygen stream by giving the pressure difference between inlet and outlet of powder dispenser. The experiment was done to know the effect of various factors, such as the iron powder consumption, cutting oxygen pressure and etc. on the cutting speed of stainless steel. The cutting speed was regulated by lose-cut phenomena (flame out) generated during cutting, whose critical speed was mainly depended on iron powder consumption and cutting oxygen pressure. The critical lose-cut speed was not influenced by the plate thickness and cutting oxygen flow rate. The critical cutting speed increases sharply with decrease of cutting oxygen pressure under 1.5kg/cm^2 gauge and shows 1500mm/min at 0.5kg/cm^2 gauge. From the behavior of Cr element at the cutting surface of stainless steel, it is considered that the action of iron powder on cutting of stainless steel is based on diluting of molten alloy and oxide layer formed at cutting surface. The dilution by iron powders assists the favorable combustion of stainless steel at cutting surface during cutting, so that the cutting of stainless steel can continue without lose-cut phenomenon. The favorable supply of iron powders is obtained at lower cutting oxygen pressure than 1.5kg/cm^2 gauge, when iron powder consumption is constant.
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