ERW Steel Pipe

During the construction of natural gas and oil pipeline stations, the installation of valves, meters, and flanges should be tapped in the main channel. It is difficult to identify the straight seam position of the base pipe by high-frequency resistance welding. The installation of some lugs is very close to the welding seam. Therefore, it is very necessary to deeply study and analyze the influence of the boss on the basic pipeline. In this paper, the residual stress distribution of high-frequency longitudinal resistance welded pipe is analyzed, and the influence of welding position of a different boss on residual stress is analyzed. The stress increases sharply and the longitudinal welding residual stress is affected when the boss installed on the   ERW pipe   is much larger than the parent pipe. ERW pipeline The distribution of residual stress in the welded pipe is closely related to the forming process. HFW resistance welding is the cross-section of a circular tube af...

The ERW welding machine technology is used to realize the high frequency welding of the electromechanical system. The high-frequency welding equipment is composed of a high-frequency welding machine and a forming machine. A high frequency welding machine is usually made up of two parts of high frequency generator and feed device. The effect is to produce high frequency current and control it. By extrusion roll frame, the function of the molding machine is high frequency current. The extrusion and melting part eliminates the oxide and impurities on the surface of the steel and makes the steel plate completely integrated into one. ERW pipe High frequency generator In the past, the use of high-frequency welded pipe unit is the three loop: high-frequency generator; solid state inverter; electronic high-frequency oscillator, and then basically improved to a single loop. There are many ways to adjust the output power of high frequency oscillator, such as autotransformer, reactance m...

ERW carbon steel tube vs spiral pipe: First, the difference between the production process ERW   carbon steel pipe   is the hot rolled coil through the continuous roll forming, the use of high-frequency current skin effect and proximity effects, so that the edge of the coil heat fusion, pressure in the squeeze roller under pressure welding to achieve production. Therefore, erw carbon steel pipe residual stress is small, through the weld heat treatment, sizing, straightening, water pressure and other processes, the residual stress to further release and reduce. Practice has proved that erw carbon steel pipe in the storage and use of residual stress on the steel pipe does not affect. Without any welding wire, the weld in the physical properties and chemical composition with the plate exactly the same. The quality of the erw carbon steel pipe depends on the quality of the sheet. Second, the difference between raw materials 3, ERW carbon steel pipe within the weld is rela...

ERW   carbon steel pipe   welding advantages: The resistance welding of ERW carbon steel pipe is a way of connecting the workpiece by welding between two electrodes, and applying the current, the application of the current through the thermal resistance produced by the surface of the workpiece and adjacent areas to heat it into the form of molten or plastic, so that the metal is connected. Advantages of ERW carbon steel tube 1, the heating time is short and the heat concentration is concentrated, so the heating area is small, the deformation and stress are small, and the mortals do not have to adjust after welding and heat treatment. 2, gold bullion has been surrounded by plastic rings, and molten metal and air are blocked. Metallurgical process is simple. 3, there is no need to solder wire, electrode and other filler metals, and oxygen, acetylene, hydrogen and other welding materials, welding costs are low. 4, resistance welding has high output, no noise and ha...

In both low and high pressure environment, we should obtain the legal steel pipe from seamless steel tube,   ERW steel pipe   and   SSAW steel pipe for long-term life service.Under this situation, we should figure out the characters and main application environment for different steel pipes. Today, we would have an introduction for application range for high frequency longitudinal ERW steel pipe. 1. Oil, natural gas convey: Municipal gas transmission, long distance transportation of oil and natural gas would under the help of high frequency longitudinal ERW steel pipe. 2. Casing and tubing: This is another area we can count on ERW steel pipe. There is only seamless steel pipe can hold on this duty. However, with the high technology's development, now we can use ERW steel pipe to replace it. 3. Constructional structural pipes: No matter round, square or rectangular, we can use ERW steel pipe for frameworks of super malls, theater, airports, bridges and so on. ...

We would hesitate between   seamless steel pipe ,   ERW steel pipe   or other welded steel pipes when we need to choose some of them for our engineering projects. Comparative method would be a nice way to decide which kind of steel pipe we need. Today, we cannot miss the three advantage for ERW steel pipe. Low cost: Cost would be a main consideration for purchasing except the quality elements. And low raw material cost and manufacturing cost would give advantage for it when customers compare it with seamless steel pipe or other welded steel pipe. High welded seam security: With the development of high technology, there is no doubt that production process of ERW steel pipe has improved a lot. Thus as a result of special welding method of melting, the weld property is better than submerged-arc welded pipes and other seamless steel pipes. Wide Range: With its range usage, ERW steel pipe can be applied with a wide range from low pressure liquid delivery, such a...