The specifications and materials of Welded steel pipes

A high-frequency welding machine to roll a long strip of certain specifications into a round tube and weld it through a straight seam. The shape of the steel pipe may be round or square or shaped depending on the sizing rolling after welding. The data of welded steel pipes are mainly low-carbon steels and low-alloy steels or other steels with σ s ≤ 300N/mm 2 σ s ≤ 500N/mm 2 . 

In short, the product can be said to be of reliable quality and welcome to send inquiry to us. Attentive service will let you fully loaded. The quality of the product is not blown out below bring everyone to see what is the product in the eyes, take straight seam steel pipe as an example:
With the characteristics of high production efficiency, low interest, and rapid and continuous production, the straight seam steel pipe has a relatively simple process. Civilian buildings, petrochemicals, light industry and other departments have a wide range of application. They are used to transport low-pressure fluids or to make various engineering components and light industrial products. Straight seam steel pipe is a high-frequency welding unit that rolls a certain length of strip into a round tube and welds it through a straight seam. The shape of the steel pipe may be round or square or shaped depending on the sizing rolling after welding. The data of welded steel pipes are mainly low-carbon steels and low-alloy steels or other steels with σ s ≤ 300N/mm 2 σ s ≤ 500N/mm 2 . 

Under the pressure of the squeezing roller, the two edges of the control tube of the extrusion force are heated to the welding temperature. Forming a common metal grain infiltrates each other, crystallizes, and finally forms a strong weld seam. If the extrusion force is too small, the number of common crystals formed is small, the strength of the weld metal is reduced, cracking will occur after the force is applied, and if the extrusion force is too large, the molten metal will be extruded out of the weld, not only reducing Weld strength, and will produce a large number of internal and external burrs, and even lead to welding joints and other defects. 

The effective heating time is longer, and the high-frequency induction coil of the high frequency induction coil position should be as close as possible to the squeeze roller position. If the sensor coil is far away from the squeeze roller. The heat affected zone is wider, and the strength of the weld seam is decreased. On the contrary, the weld seam is insufficiently heated and the molding is poor after extrusion. 

The cross-sectional area of the impeder is usually not less than 70% of the cross-sectional area of the inner diameter of the steel tube. Its role is to form an electromagnetic induction loop between the edge of the induction coil, the weld edge of the tube blank and the magnet bar, and the impeder is a special magnetic bar for one or more welded tubes. Proximity effects occur, eddy current heat is concentrated near the edge of the tube blank weld, and the edge of the tube is heated to the welding temperature. The impeder is dragged with a wire inside the tube blank. 

Due to the rapid movement of the tube blank, its center position should be relatively fixed near the center of the squeeze roll. At startup. The impeder is subject to friction due to the friction of the inner wall of the tube blank and needs frequent replacement. 

Need to clear. The method of cleaning is to fix the tool on the frame. After the weld is welded and squeezed, a welding file will be produced. By the rapid movement of the welded pipe, the welding screed is leveled. The burr inside the pipe is generally not removed. 

Both seamless and welded pipes are our product range. The company solemnly promise: to ensure that the best quality, the competitive price, the most complete after-sales service, to thank the new and old customers. If you need special model specifications, that can be customized in advance.