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Wall Thickness Deviation And Welding Of Steel Pipe

Qingdao Wuxiao | Updated: Oct 30, 2017

Tube Billet heating should be even, prohibit the rapid take-off and landing temperature. The temperature of each liter should be kept steady and slow, and the maximum elevation should not exceed 30 ℃. Determine whether the centering roller installation is in place, adjust the center of the related core roller, open angle and the opening size of each action is consistent, the core roller center should be on the rolling line.Steel Pipe

Make sure that the center line of the piercing mill is consistent with the center line of the perforated trolley to avoid "rolling" or "rolling down" to keep the billet in force even during piercing. For wear of the Head, guide plate, roll and other rolling tools to be replaced in time.Steel Pipe

The center of the roller distance and guide distance must be on the rolling line. The center line of the guide distance and the roll distance is equal to the upper and lower roller spacing and the left and right guide distance. The perforation top bar generally chooses the outer diameter as the φ108mm-φ114mm, and the wall thickness requires ≥25mm and thick wall tube with uniform thickness. Core bar to choose thick wall thick tube processing, for the smaller size of the core bar, can be replaced by solid billet. The thickness of thick wall pipe and solid billet can greatly reduce the probability of bending deformation of the mandrel, which can effectively improve the wall thickness precision of the steel pipe.Steel Pipe The length of the mandrel is relatively large, the general use of the first car diameter and then break the mouth welding, or the use of long material directly turning molding. The external machining precision of the mandrel is controlled in ±0.1mm, the straightness deviation of the mandrel is not more than 5mm. When welding, the two-section mandrel is inserted into a fine-machined dowel for positioning to prevent the total straightness deviation caused by welding to be too large. Welded steel pipe used in the billet is steel plate or strip, because of its different welding process and divided into furnace welded pipe, welding (resistance welding) pipe and automatic arc welded pipe. Because of its different types of welding is divided into straight seam welded pipe and spiral welded pipe two.Steel Pipe

Straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe, which can produce pipe with larger diameter with narrower billet, and can produce pipe with different diameters with same width. But compared with the same length of straight seam tube, the weld length increases $number and the production speed is lower.Steel Pipe


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