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Widely used spiral welded pipe units

Spiral welded pipe mill is widely used to make structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame a
Widely used spiral welded pipe units
Spiral welded pipe mill is widely used to make structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffold for construction jack, etc. Pipes have been widely used in manufacturing. When the pipe is under internal pressure, there are usually two kinds of primary stresses on the pipe wall of spiral welded pipe mill, namely radial stress Delta Y and axial stress Delta X. The stress at the weld is delta Y = (l/4sin2 alpha +cos2 alpha) 1/2, during which alpha is the helix angle of the weld of the spiral welded pipe. Tubes can be divided into circular and special-shaped tubes according to their cross-sectional shapes. Because the circular area is the largest when the circumference is flat, circular tubes can transport more fluid.



When the ring section of spiral welded pipe mill is subjected to internal or external radial pressure, the force is more uniform. Therefore, most of the steel pipes are circular. The weld of spiral welded pipe mill is longer than that of straight welded pipe. If the pipe length is L, the weld length is L/cos. There has been a long-standing debate about the superiority of spiral pipe and straight-seam pipe, especially in comparison with UOE pipe. To this day, we have evaluated and compared the manufacturing skills of spiral welded pipe mill with a correct view. The spiral welded pipe mill has reconsidered the question of longer welds of spiral welded pipe mill. The outer diameter of a pipe of spiral steel pipe is indicated by the letter D, after which the scale and wall thickness of the additional outer diameter, such as the seamless steel pipe with the outer diameter of 108, and the wall thickness of 5mm, are indicated by D108*5. The plastic pipe is also indicated by the outer diameter, such as De63. Other such as reinforced concrete pipe, cast iron pipe, galvanized pipe, etc. are indicated by DN. The nominal diameter is usually chosen to indicate that the nominal diameter of spiral welded pipe mill is a specification for describing the convenient man-made rules for manufacturing and repairing, and the nominal diameter is the standard name of the pipe (or fittings).
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