What are the lines resulting from the cutting oxygen stream in metal cutting called?

The lines resulting from the cutting oxygen stream in metal cutting are known as drag lines. These lines are formed as the molten metal is blown away by the oxygen during the cutting process, creating a noticeable pattern on the surface of the cut metal. The presence and arrangement of these drag lines can indicate the direction of the cutting operation and the characteristics of the molten metal flow. Recognizing and understanding drag lines is essential for assessing the quality of cut surfaces in metal fabrication and ensuring precision in machining and construction.