Spiral steel pipe can be widely used in the production of large diameter steel pipes for the following reasons:
1) As long as the forming angle is changed, steel pipes of various calibers can be produced with the same width of strip steel; 2) Because of the continuous bending forming, the fixed length of the steel pipe is not limited; 3) The spiral shape of the weld is evenly distributed throughout On the circumference of the steel pipe, the dimensional accuracy of the steel pipe is high, and the strength is also high; 4) It is easy to change the size, which is suitable for the production of small batches and multiple varieties of steel pipes.
The spiral steel pipe adopts the welding seam gap control device to ensure that the welding seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the welding seam gap are all strictly controlled. Both internal and external welding is performed by American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding specifications. The air plasma cutting machine is used to cut the steel pipe into single pieces. The welded seams are all inspected by an online continuous ultrasonic automatic injury instrument to ensure the coverage of non-destructive testing of spiral welds. If there is a defect, the marking is automatically applied and the production worker adjusts the process parameters at any time according to this, and the defect is timely.
Welded Steel Ssaw Spiral Pipe
The mechanical properties of large diameter spiral steel pipe are to ensure the final performance of steel, mainly depends on the chemical composition of the steel and heat treatment system, different uses of steel pipe heat treatment method is different, the detection method is also different Yes, the tensile strength, yield point, cross-sectional shrinkage, etc. of spiral welded steel pipes can be calculated using formulas, and the cross-sectional shapes of other steel pipes for different purposes are also different. The mechanical properties of spiral welded steel pipes are to ensure the final performance of the steel, which mainly depends on the chemical composition of the steel and the heat treatment system. The heat treatment methods of steel pipes for different purposes are different, and the detection methods are also different. The strength, yield point, cross-sectional shrinkage, etc. can all be calculated using formulas, and the cross-sectional shapes of other steel pipes for different purposes are also different.
Welded steel SSAW spiral pipe surface treatment method: 1, cleaning, the use of solvents, emulsion cleaning steel surface to achieve removal of oil, grease, dust, smoothing agent and similar organic matter, but it can not remove the steel surface Rust, scale, welding flux, etc., so it is only used as a supplementary trick in the production of anticorrosion. 2. For derusting tools, firstly use steel wire brushes and other tools to polish the steel surface, which can remove loose or warped 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 is attached with a strong scale, the result of tool rust removal is not ideal, and the anchor depth required for anti-corrosion construction cannot be reached. 3. Pickling, chemical, and electrolytic methods are generally used for pickling. Pipeline anti-corrosion only uses chemical pickling, which can remove the oxide scale, rust, and old coatings. Sometimes it can be used for reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor lines are shallow, and it is easy to form pollution to the situation. 4. Spray (throw) shot rust removal, spray (throw) shot rust removal is a high-speed motor-driven spray (throw) shot blade high-speed torsion, which makes the abrasive effect of steel grit, steel shot, wire section, minerals, etc. The spraying (throwing) treatment of the surface of the steel pipe can not only completely remove the rust, oxide and dirt, but also achieve the average roughness required by the steel pipe under the effect of the fierce impact and friction of the abrasive.
After spraying (throwing) the rust, not only can the physical adsorption effect of the pipe surface be expanded, but also the mechanical adhesion effect of the anti-corrosion layer and the pipe surface can be strengthened. Therefore, spray (jet) rust removal is an ideal rust removal method for pipeline corrosion protection. Generally speaking, shot blasting (sand) rust removal is mainly used for pipe internal and external disposal, shot blasting (sand) rust removal is mainly used for pipe surface treatment. The chemical derusting method is to apply the rust conversion primer directly to the place where there is rust. The polymer reaction occurs when the rust is encountered. The color is black after conversion, and the adhesion is extremely strong. It can prevent rust alone. After chemical cleaning, use the gas phase rust inhibitor. Put the gas phase rust inhibitor into a bag and string it inside, or use a blower to blow the gas phase rust inhibitor into it. It is simple and easy.
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