Spiral seam submerged arc welded steel pipe surface how to do treatment?
Application of solvents, emulsions to clean the steel appearance, in order to achieve the removal of oil, grease, dust, smoothing agent and similar organic matter. But it can not remove the steel appearance of rust, oxidized skin, welding flux, etc., and therefore in the anti-corrosion production only as an auxiliary measure.
The primary use of wire brushes and other tools on the steel surface grinding, you can remove loose or warped oxide, rust, welding slag and so on. Hand tool rust removal can reach Sa2 level, power tool rust removal can reach Sa3 level.
Commonly use chemical and electrolysis two ways to do pickling disposal. Pipeline anticorrosion only chemical pickling, can remove the oxide skin, rust, old coating. Sometimes can be used as a sandblast rust removal after re-disposal. Chemical cleaning can make the appearance to reach a certain degree of cleanliness and roughness, but its anchor pattern is shallow, and easy to form pollution to the situation.
Spraying (throwing) shooting descaling is driven by high-power motor spraying (throwing) shooting blade high-speed twisting, so that steel sand, steel shot, wire segments, minerals and other abrasives in the centrifugal force effect of the steel pipe exterior spraying (throwing) shooting disposal. Not only can purge rust, oxides and dirt, and steel pipe in the abrasive ferocious impact and friction effect, but also to reach the required average roughness.
After spraying (throwing), it can not only extend the physical adsorption effect on the appearance of the pipe, but also strengthen the mechanical adhesion effect between the anti-corrosion layer and the appearance of the pipe. Therefore, spraying (throwing) descaling is the ideal descaling method for pipe anticorrosion. Generally speaking, shot blasting (sand) descaling is mainly used for the disposal of the inner appearance of the pipe, and shot blasting (sand) descaling is mainly used for the disposal of the surface of the pipe.
