The seamless high-frequency welded steel pipe has the characteristics of relatively simple processing, rapid and continuous production, and the process in production is simple and convenient, and is produced and processed according to the corresponding process. Seamless steel pipes are widely used in civil construction, petrochemical, light industry, etc., and are used to transport low-pressure fluids or make various engineering components and light industrial products. They exert important functions and values ​​in different industries and show good characteristics. And function. Let's first introduce the production and processing process of seamless steel pipe products, and the matters that should be paid attention to during use.
1. Production process of seamless pipe
The seamless steel pipe is a high-speed welding unit that winds a long strip of certain specifications into a round tube and seamlessly welds the steel tube, which has a good welding process and technology. When welding seamless steel pipes, the shape of the steel pipe may be circular or square or irregular. The choice of steel pipe depends on the sizing rolling after welding. The material of welded steel pipe, the material of steel pipe is different, the main production and processing technology will be different. The processing materials are low carbon steel and low alloy steel or other steel with σs≤300N/mm2 and σs≤500N/mm2. The welding technology of seamless steel pipe is relatively simple, and it is produced and processed through the corresponding process technology to ensure the important role and value in the use and reflect the good value.
2. High-frequency welding technology of seamless steel pipe
The high-frequency welding of seamless steel tubes is based on the principle of electromagnetic induction and the skin effect of alternating current charge in the conductor, the proximity effect and the eddy current heat effect, so that the steel of the edge of the weld is locally heated to a molten state, and the butt welding is performed by the extrusion of the roller. The seam achieves intergranular bonding to achieve the purpose of weld welding. High-frequency welding is a kind of induction welding (or pressure contact welding), which does not require weld filler, no welding splash, narrow welding heat affected zone, beautiful welding and good mechanical properties, so it is affected by the production of steel pipe. A wide range of applications.
The high-frequency welding of seamless steel tubes is precisely the skin effect and the proximity effect of alternating current. After the steel (strip) is rolled and formed, a circular tube blank with a broken cross section is formed, which is close to the center of the induction coil in the tube blank. Rotating one or a group of resistors (magnet bars), the impedance and the billet opening form an electromagnetic induction loop. Under the effect of the skin effect and the proximity effect, the edge of the billet opening has a strong and concentrated thermal effect, so that the welding The edge of the seam is rapidly heated until the temperature required for welding is pressed by the pressure roller, and the molten metal realizes intergranular bonding, and after cooling, a firm butt weld is formed.
The seamless tube welding technology needs to be mastered and well controlled during welding to ensure that the welded steel pipe has no quality and functional problems and quality, and exerts important functions and values ​​in use.
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