High-frequency welded steel pipe is a steel pipe made by rolling a long steel strip of a certain specification into a round tube through a high-frequency welding unit, heating and melting the edge of the tube blank through the skin effect and proximity effect of high-frequency current, and then pressure welding under the action of the extrusion roller. This welding method does not require weld filler, has less welding spatter, a narrow heat-affected zone, beautiful welding shape, and good welding mechanical properties.
Compared with traditional seamless steel pipes and spiral steel pipes, it has the following characteristics:
1. Reliable quality: High-frequency welded steel pipes adopt advanced welding technology and production processes, and the welds are uniform, firm, and reliable in quality.
2. High production efficiency: High-frequency welded steel pipes adopt continuous production methods, with high production efficiency and suitable for mass production.
3. Low cost: Compared with seamless steel pipes and spiral steel pipes, high-frequency welded steel pipes have lower manufacturing costs.
4. Wide application: High-frequency welded steel pipes are suitable for construction, transportation, oil, natural gas and other industries, and are widely used in pipelines for transporting liquids, gases and solids.
In addition, the production process of high-frequency welded steel pipes can be divided into four steps: steel plate forming, welding, cooling, and cutting. The specific process is as follows:
1. Steel plate forming: cold forming and hot forming are used. Cold forming refers to bending cold-rolled or hot-rolled steel plates through molds and welding them into steel pipes with a certain shape; hot forming refers to heating the steel plates and plastically deforming them into steel pipes with a certain shape.
2. Welding: The steel plates at both ends of the steel pipe are heated by high-frequency current to melt them quickly and tightly join to form a continuous weld.
3. Cooling: The welded steel pipe is cooled to achieve the ideal strength and hardness.
4. Cutting: The cooled steel pipe is cut as required to meet the requirements of shape and specifications.
High frequency resistor welded pipe
