Although the standard specifies the "surface smooth" of the spiral tube, some spiral pipe manufacturers are on the surface of steel pipes on the surface of the steel pipes in the manufacturing. Many problems include: gaps (cracks), hair pattern, hair pattern, inner folding, outer folding, rolling, outer trails, outer layers, crusts, recessed, convex buns, hemp (hemp surface (quilted, outer trails, outer trails, outer trails, outer trails, outer trails, outer trails, outer trails, outer tracts, outer tracts, outer tracts, outer tracts, outer straight laminates, scabs, recessed bags, hemp noodles (hemp surface (hemp surface (hemp surface ), Scratch (scratch), internal spiral roads, external spiral roads, green lines, corrected concave, roller prints, etc.
In the surface problems on the surface of the steel pipes, some problems are very serious for the harm of steel pipe performance indicators and are called harmful issues.
Such as steel pipe cracks (cracks), inner folding, folding, rolling, departure, scabs, stretching, convex bags, etc.; Some problems directly affect the performance indicators of the steel pipes less. Such as the spiral tube tube aneng (surface), blue line, rubbing (scratch, touch) injury, mild inner trail and external straight road, mild internal spiral roads and external spiral roads, orthodontic recesses, roller prints, etc. Although some very mild and practicality of the spiral tube directly affects extremely small problems can be retained on the steel pipe, the depth and length (size) of the standards still have very stringent limitations on the depth and length (size) of its problems.
The method of removing or grinding for harmful spiral tubes on the surface of the harmful spiral tube is completely eliminated. When the problems on the surface of the steel pipes that can be used for repair are completed, the depth of the standard ground and the shape of the grinding point must meet the standard standards. Therefore, in order to better improve the surface quality of the spiral tube, the spiral pipe manufacturer sometimes completes the spray (sand), sand milling or machine processing on the surface of the steel pipe.
