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　　Galvanized steel pipe rust removing method

　　1. First, the surface of steel is cleaned by solvent, and the organic matter on the surface is removed.

　　2. Then use tools to remove rust (steel brush), loose or inclined scale, rust, welding slag, etc.

　　3. Use pickling method.

　　Welded connection

　　1. ASTM A106 Sch 20 Hot Dip Galvanized Steel Pipe nozzle is not in a straight line after butting and there is a problem of beveling in the steel pipe. It is suggested that the pipe nozzle should be cut off for a short period before processing.

　　2. After the butt of galvanized steel pipe orifice, the butt of two pipe orifices is not strict, resulting in uneven thickness of weld orifice; and the ellipse of pipe orifice caused by the collision of steel pipe due to its own reasons or transportation. It is suggested that the pipe head be cut off for a short period and then processed.

　　3. After the butt joint of galvanized steel pipe, there are zinc nodules at the pipe mouth due to technical reasons, resulting in difficulties in welding and sand holes. Simple removal of zinc nodules for excessive zinc nodules and excessive tubes is carried out.

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