Because the individual quality of the spiral welded pipe
is relatively large, it must be stacked outdoors, but it is unavoidable to be exposed to the sun and rain, so the problem of rust has always plagued the storage time and conditions of the spiral welded pipe
. Therefore, we must carry out a comprehensive answer to the rust prevention knowledge of spiral welded pipes
The steel surface is mainly polished with tools such as wire brushes. The cleaning and preheating of the spiral welded pipe
can remove the loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the rust removal of power tools can reach the Sa3 level. If the steel surface adheres to a firm scale of iron oxide, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
Pickling uses solvents and emulsions to clean the surface of welded steel pipes (welded pipes) for low-pressure fluid transportation to remove oil, grease, dust, lubricants, and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. on the surface of the steel. Therefore, it is only used as an auxiliary means in anti-corrosion production.
Generally, two methods of chemical and electrolysis are used for pickling treatment. Pipeline anti-corrosion only adopts chemical pickling, which can remove oxide scale, rust, and old coating. Sometimes it can be used for reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow, and it is easy to cause pollution to the spiral welded pipe
Reasonable use of means to clean rusted pipe fittings ensures that the pipe fittings serve production for a long time and create more production benefits.