1. Regardless of the rotation of the straight seam steel pipe or the fixed cutting nozzle, it should be kept perpendicular to the surface of the straight seam steel pipe. After cutting, the cutting nozzle is gradually inclined forward to an angle of 70°-80° with the tangent of the cutting point.
2. When gas cutting to fix straight seam steel pipe, generally start from the lower part of straight seam steel pipe.
3. The selection of cutting nozzle and oxygen pressure is related to the thickness of the straight seam steel pipe, and can be selected according to the actual situation.
4. The distance between the cutting nozzle and the surface of the straight seam steel pipe should be determined according to the length of the preheated flame and the thickness of the straight seam steel pipe, generally 3-5mm from the end of the flame core.
5. After the straight seam steel pipe is cut, use a file to remove the iron oxide slag at the incision to make it smooth and clean. At the same time, the end face of the straight seam steel pipe mouth should be kept perpendicular to the center line of the pipe.