ERW Steel Pipe

In the hydrostatic test of ERW steel pipe, it is often found that the bursting opening breaks from the weld of the ERW pipe, which indicates that the strength of the weld site is lower than that of the base metal. Through experimental analysis, it has been found that if an internal scratch groove is formed on the inner surface of the steel pipe during the removal of the burr in the weld, the wall thickness of the sample at the weld site is reduced. In the tensile test, the sample is easily broken from this point. . The water pressure test of the water supply pipeline is the means for the final quality assessment of the ERW steel pipe laying. Generally, we have two requirements for the work of the hydrostatic pressure test: First, it must be able to accurately reflect the leakage of the pipeline; second is the pressure test. There is no problem, nor can the interface suffer damage due to pressure test. Instead, it will affect the quality of the project, or rework to retry, resulting ...

How to improve the impact toughness of ERW steel pipe welds is a major problem in the technology of pipe making. On the basis of mass production practices, various factors affecting the impact toughness of ERW straight seam resistance welded steel pipe welds were analyzed. It is pointed out that in order to further improve the impact toughness of welds and meet the high toughness requirements of long-distance pipelines for ERW steel pipes, it is necessary to start with the control of the quality of raw material coils, combined with the pipe-making process, and strengthen the quality control of forming, welding and on-line heat treatment after welding. . 1 ERW steel pipe weld joint toughness characteristics The welding process of ERW steel pipe uses the principle of skin effect produced by high-frequency current to heat the edge of the hot rolled plate to the molten state, and then it is welded by the mechanical extrusion method. A white fusion line appears at the center of the weld ...

ERW (resistance welded pipe) The name ERW is because such stainless steel pipes involve certain types of welding processes such as spot welding and seam welding. Seam welding is usually used when manufacturing round, square and rectangular stainless steel pipes. The stainless steel band is unwound from the coil and trimmed to control the width and adjust the edges for welding. The strip then passes through a series of shaped rolls that cold form the material into a circular (square or rectangular) shape. The edges are butt joints under pressure and then welded by heating the material to a temperature above 2000F. Wait until the flash weld that has been formed is removed from the outer diameter of the tube. Once the weld has been tested, it can then pass through a series of sizing rolls to obtain the exact final dimensions, and then the stainless steel tube is straightened and cut to the required length. The welding state (usually called the flash condition) of the product during the...

In order to give customers secure steel products, such as seamless steel pipe,  ERW steel pipe  and so on, Tianjin Xinyue Steel Group would do various tests before the finally step of selling. Our steel pipes’ tests covers from Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test to X-ray Test. Today, we would like to have a details introduction to Hydrostatic Pressure Testing. Hydrostatic Pressure Testing: Hydrostatic test is a test which coming after the pressure vessel is manufactured. Manufacturers would add appropriate amount of water to the vessel in order to test the macroscopic strength of the vessel (if it is deformed too much) and the sealing point and welding before the newly installed vessel 3 is used or entered. Check www.tjxysteel.com for more info. Contact Email: marketin...

Formed on hot rolling or cold rolling, steel pipe, no matter seamless steel pipe,   ERW steel pipe   or galvanized steel pipe has encounter the whole improvement with the advanced technology coming. Improved quality of raw materials for steel pipe: with the precise calculation of the components of raw material, such as steel design of low carbon, low P, S, Ni, and micro-alloying, we can make more exact quality for steel pipe which will make sure of the high quality of the steel pipe. What’s more, technical production skill would be improved. With the improvement of advanced skill to produce steel pipe, there is no doubt that we would provide high quality steel pipe for clients. For example, we can take computer automatic compensation system to automatic control high frequency, heat input and so on. Under this situation, the data would be precious than ever. Check www.tjxysteel.com for more info. Contact Email: marketing@xysteelpipe.com .

Resistance welding is to press the workpiece to be clamped between two electrodes and apply an electric current, which is heated to a molten or plastic state by the resistance heating effect caused by the current flowing through the contact surface of the workpiece and the adjacent region, so as to form a metal. A combination of methods. Welded pipes made with resistance welding are called electric resistance welded pipes(erw pipe). ERW pipe machine ERW pipe machine, its efficiency is 3 to 5 times higher than the traditional TIG welding. Due to frequent occurrence of defects such as incomplete penetration of the root and sagging of arc pits, the TIG welding MIG welding filler and capping process was used. Although the improved welding process basically solved the problem of incomplete penetration of the root, the welding efficiency was reduced. Increased investment in equipment, but also complicated operating procedures. The principle of hot wire TIG welding is to supply the...

According to the production process, we know that there are lots of processes for the manufacture of  ERW steel pipe . And here are some main welding process parameters during ERW steel pipe’s making. 1. Input power: input power control is an art for steel pipe’s production. If there is no enough input power, the edge of the strip cannot be completely melted. 2. Production speed: like the input power, we should make the right speed for ERW steel pipe’s making too. If the speed is too fast, the input heat is insufficient, and the solid oxide at the end can not be extruded to form a low-temperature welding defect 3. Opening angle: different angle would lead to different shape for steel pipe. So that we should take control for the opening angle during production. 4. Welding pressure: If the welding pressure is not enough, the weld lines on the two sides of the streamline of the metal structure are not obvious, and the welding strength does not meet the requirements. 5. ...

Welded skill has matured in the world and welded steel pipe from  ERW steel pipe  to galvanized steel pipe has been used widely in multifarious engineering project. Today, we’ve got a list for weld pipe. Welded pipe includes LSAW steel pipe, ERW steel pipe and SSAW steel pipe in Threewaysteel. SSAW Steel Pipe: This kind of steel pipe can convey fluid, metal structures, pile and so on. And thus they are widely used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. LSAW Steel Pipe: Longitudinal Submerged-Arc Welded Steel Pipe Process: LSAW-UO(UOE), RB(RBE), JCO(JCOE, COE); DSAW-Double Submerged Arc Welded Usage: Used for low pressure liquid delivery, such as water, gas, and oil. Standard: API 5L, API 5CT, ASTM 53, EN10217, DIN 2458, IS 3589, GB/T3091, GB/T9711 ERW Steel Pipe: Electric Resistance Welded Steel Pipe Usage:Used for low pressure liquid delivery, such as water, gas, an...