Measures to prevent milling defects of spiral seam submerged arc welded steel pipes

CHANGSHA, China - Jan. 7, 2025 - PRLog -- Reasonable selection of milling process according to actual production conditions. Under the condition of ensuring production, try to use a single milling process and select an I-type groove, to reduce milling defects and make it easy to process. Selecting a suitable working width can not only reduce the probability of de-milling but also maximize the life of the blade, thereby improving the processing accuracy. Theoretically, the milling amount of 8~10mm is generally selected, that is, the milling working width = the narrowest actual original plate width of 8mm. However, one thing needs to be pointed out if the narrowest width deviation of the steel plate is large during production, it is not appropriate to adopt a fixed milling width. For example, it is often encountered that a batch of steel pipes is produced using steel coils from two steel mills. Generally speaking, the width deviation of steel coils from different steel mills is large. At this time, to improve the yield rate and reduce the milling amount of the blade, a flexible adjustment method should be adopted. A reasonable selection of groove depth according to the thickness of the steel plate gives it a large room for maneuvering.

2. Strengthen the control of steel plates to ensure the quality of steel plates:

Strengthen the leveling control of the leveling machine to ensure that the flatness of the steel plates is consistent and prevent the steel plates from entering the milling machine with "wave bends"; strengthen the control of material discharge and vertical rollers to try to eliminate the influence of the "crescent bend" of the original plate and prevent the generation of artificial "crescent bends".

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