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|Member since||Mar 13, 2020|
The seamless welded pipe production technology was invented in Germany, and the technology since then is mainly in Germany. The United States is a pioneer in the development of electric resistance welded pipe (ERW welded pipe) production technology. Since its birth, there have been major technological advances almost every ten years. During this period, the United States has always been the protagonist of technological progress. Other countries can only look forward to the project and adopt the method of introducing technology. American Elihu Thomson invented the application of resistance heating to welding metals. Around 1900, a large number of pipe making methods based on the Thomson principle appeared. Several typical methods were: the method invented by the American Standard Welding Company; the method invented by the German R. Kronenberg; the method invented by the Norwegian Soennichsen and the lap resistance law. Although these methods quickly disappeared, they ... Continue reading →
The high-frequency welded pipe (ERW steel pipe) forming roll is an important part of the welded pipe unit and the technical core of the welded pipe forming process. The forming of high-frequency welded pipe needs to go through five basic processes: edge bending-overall bending-closed introduction-extrusion welding-shaping. In the welded pipe industry, the process before high-frequency welding is usually called preforming. (1) Edge forming Edge forming is the first step in the forming process of high-frequency welded pipes. Its purpose is to bend the edge of the strip to the curvature of the squeeze roll radius. The traditional process uses single radius forming, and the modern process uses double radius forming. The initial double-radius forming was a simple double-radius upward bending, which was later developed into W forming. The bending of the middle part of the molding method uses reverse protrusions to more fully bend the edges, and the linear ... Continue reading →
Compared with traditional pipes, seamless steel pipes have lighter raw materials, high strength, good durability, can withstand higher internal pressure, are sensitive in production and use, and can be used in messy or harsh geological conditions. However, there are disadvantages in the use process, mainly because the internal and external anti-corrosion treatment is more troublesome. The first is the problem of outer wall anti-corrosion. The quality of outer wall anti-corrosion directly affects the service life. At present, the outer wall anti-corrosion of domestic steel pipes is mainly: concealed method, steel pipes are required to be reinforced or specially reinforced outer wall anti-corrosion, and cathodic protection is promoted in some areas. The common anti-corrosion methods for outer walls include coatings such as petroleum pitch and epoxy coal pitch. The latter is not easy to solidify at low temperatures, and there are many problems during field welding. In ... Continue reading →
There are many ways to inspect the quality of LSAW steel pipes, among which physical methods are also the most commonly used inspection methods. Physical inspection is a method of measuring or inspecting using some physical phenomena. The inspection of internal defects of materials or longitudinally welded pipes generally adopts non-destructive testing methods. The current non-destructive testing includes magnetic testing, ultrasonic testing, radiographic testing, penetrating testing and so on. 1. Magnetic inspection Magnetic inspection can only find defects on the surface and near the surface of the magnetic LSAW longitudinally welded pipe, and only quantitative analysis of the defects can be done, and the nature and depth of the defects can only be estimated based on experience. Magnetic inspection is to use magnetic field magnetization of ferromagnetic longitudinally welded pipes to generate magnetic flux leakage to find defects. According to the different methods of measuring ... Continue reading →
Steel pipe piles are commonly used components in the construction of bridge pile foundations. It has the advantages of high bearing capacity, flexible piling and fast construction speed. For complex terrain, steel pipe piles are more suitable for this environment. 1) Type of steel pile Types of steel piles There are currently three types of steel piles commonly used in engineering construction, namely steel pipe piles, profile steel piles, and steel sheet piles. 1. Compared with other steel piles, steel pipe piles have their unique advantages in many aspects. For example, bending stiffness, single pile bearing capacity and many other aspects. 2. Shaped steel piles I and H are the more common cross-sectional shapes of steel piles. Both I and H-shaped steel piles can be used in horizontal load and vertical load bearing. 3. The steel sheet pile has many forms, and the shape of the interface grooves on both sides are different. After the second sheet pile is in place, ... Continue reading →
Causes of scratches on the surface of welded pipes (LSAW/SSAW/ERW Pipe): The welded pipe using roll forming requires the strip to be bent into a circle transversely. This is achieved by deforming the strip by a series of rolls with different grooves. Each pair of rolls rotates at a certain speed, but the linear velocity of the roll surface is different due to the radius of rotation. However, the difference in linear speed makes the sliding friction between the strip and the forming roller the root cause of the scratches on the surface of the welded pipe. Most welded pipe mills adopt the horizontal forming method. For this mill, the active roll bottom diameter of the roughing roll, guide ring roll and sizing roll is considered to be the driving diameter, and the linear velocity of these roll bottom diameters is basically equal to the conveying speed of the strip. Due to the different radius of rotation, the roll edge of each roll makes the relative sliding friction between the strip ... Continue reading →
Submerged arc welding (SAW) is mainly suitable for welding at the flat welding position. If certain tooling aids are used, welding at fillet welding and horizontal welding positions can be realized. The main factor that affects the shape and performance of the submerged arc welding seam is the welding process parameters. The welding parameters of submerged arc welding mainly include: welding current, arc voltage, welding speed, welding wire diameter and extension length. 1. Welding current Under general welding conditions, the weld penetration is directly proportional to the welding current. With the increase of welding current, the penetration depth and weld reinforcement increase significantly, while the width of the weld does not change much. At the same time, the melting amount of the welding wire also increases correspondingly, which increases the residual height of the weld. As the welding current decreases, the penetration and the surplus height decrease. 2. Arc voltage As ... Continue reading →
The straightening of steel pipes is an important process in the production of straight seam steel pipes. Especially for the high quality API standard petroleum casing and oil and gas pipes, special pipes for machinery and equipment, these steel pipes not only have strict requirements on the steel grade and weld quality, but also have high straightness of the steel pipe. Requirement, because the deviation of straightness is directly related to the processing and connection of the pipe end threads and pipe collars of the oil casing and conveying pipe, as well as the distortion of the pipeline during use. There are two processing forms of pipe end wire turning-pipe rotation and tool rotation. Most of the wire processing uses pipe rotation, which requires higher straightness of the steel pipe. When it comes to steel pipe straightening, we must first figure out why the steel pipe bends during the production process? Many people will think: Is this problem still necessary? In fact, ... Continue reading →
There are many standards for selecting oil casing manufacturers, which can be divided into short-term standards and long-term standards according to the length of time. The short-term standards for selecting oil casing manufacturers mainly include product quality, price level, timely delivery and overall service level. 1. Product quality The quality of the purchased oil casing meets the requirements of the purchasing unit is a condition that the purchasing unit must consider when purchasing the oil casing. Poor quality and low price casing products have lower procurement costs, but will lead to an increase in the total cost, but if the quality is too high, it will far exceed the production requirements, which is also a waste. Therefore, the quality requirements of the oil casing in the procurement The production needs of the enterprise must be consistent, and the requirements are too high or too low are not appropriate. 2. Lower cost A lower purchase price is an important ... Continue reading →
The straight seam high frequency welded steel pipe (ERW welded pipe) has advanced forming technology, reliable quality, good welding position, stable welding parameters, fast welding speed and high output. The equipment and technology of the entire production line are at the current international first-class level. The high frequency straight seam welded pipe mill is used to level the fixed strip after slitting line, and entry it to forming machine, bend to open pipe by roller, melt the strip edges through the high frequency current, squeeze and weld the pipe to be closed by squeeze roll. Features: (1) The springback and residual stress of the longitudinal high-frequency welded steel pipe are small during the forming process. (2) The deformation and hardening effect is small, and the geometric dimensions are accurate after being rounded, which is beneficial to ensure the quality of construction and welding. (3) Longitudinal high-frequency welded steel pipe has ... Continue reading →
The production process of straight seam steel pipes is relatively simple, and the main content of the production process is high-frequency welded straight seam steel pipes (ERW) and submerged arc welded straight seam steel pipes (LSAW). The production efficiency of straight seam steel pipes is high, the cost is low, and the economy develops rapidly. The strength design of spiral steel pipes (SSAW) is usually higher than that of straight seam steel pipes. The main content of steel pipe production technology is submerged arc welding. Spiral steel pipes can be used to produce welded pipes with the same width of billets and different diameters, or narrow billets can be used to produce welded pipes with larger diameters. However, compared with the straight seam steel pipe of the same length, the welding length is increased by 30% and 100% respectively, and the production speed is relatively low. Therefore, most large-diameter steel pipes are welded by spirals, while most ... Continue reading →
Oil casing buckle type code: short circle (BTC), long circle (LC), buttress (BC), some imported goods are marked with the word LTC, that is, long threaded oil casing pipe. Let us follow the oil casing manufacturers to learn more about it: Common tubing thread Tubing thread is commonly divided into three types: EU, NU and New Vam. These three types of buckle can be found in the tool shop, among which EU and NU are difficult to distinguish from the appearance of the buckle alone, and they are all triangular buckle types. But it can be easily distinguished from the entire pipe string, that is, EU means external thickening, and NU means no external thickening. New Vam is actually a trapezoidal buckle (the cross section of the buckle is rectangular), and it is also not thickened outside, so it is easy to distinguish. The three types of buckles will be described in detail below with schematic diagrams. 1) EU(External upset) EU is an outer thickened tubing ... Continue reading →
The sizing of high-frequency straight seam welded pipes (ERW welded pipe) refers to the rolling of welded pipes after welding by rollers of a specific pass, and the round or special-shaped pipes of irregular size and shape are adjusted to finished pipes with regular shapes and sizes that meet the requirements of the standard. The basic functions of diameter technology have four aspects. 1) Determine the basic size and shape of the welded pipe 1. Circle→circle, by adjusting the adjustment of the sizing round pass roll, the irregular round pipe to be sizing after the squeeze roll is adjusted to a finished round pipe with a qualified cross-sectional shape and size. The roundness of the measurement pipe is not only determined The distribution of the actual tolerance zone also depends on the ovality of the pipeline. The ovality is generally 80% of the limit deviation. In practice, although some welded pipes have no over-tolerance, they exceed the ovality tolerance or tolerance zone ... Continue reading →
Welding heat-affected zone（HAZ) is different from welding seam. Welding seam guarantees performance requirements through chemical composition adjustment, redistribution and proper welding process, while the performance of heat-affected zone cannot be adjusted by chemical composition. This is due to the microscopic effect of thermal cycling. Due to the uneven distribution of the structure, for general welded structures, the hardening, embrittlement, toughening and softening of the heat-affected zone, as well as comprehensive mechanical properties, corrosion resistance and fatigue properties, are mainly considered, which should be determined according to the specific application requirements of the welded structure. A complete high-frequency welded pipe weld (ERW pipe) is composed of a fusion zone and a heat-affected zone. The fusion zone is a narrowly defined weld. Welding theory and practice point out that the quality of welding depends not only on the weld, but also ... Continue reading →
Because the multi-wire submerged arc welding of longitudinally welded pipes has the characteristics of large undercooling and fast welding speed, the equilibrium state is basically eliminated. If the same chemical composition as the base metal is used as the welding material, the weld metal will have low plasticity, Low toughness, high strength mechanical properties. When operating the oil and gas transportation longitudinally welded pipes(lsaw steel pipe) with high technical requirements, if the safe operation of the pipeline is to be fully ensured, it is necessary to have good impact toughness and plastic welds, in order to avoid the crack resistance, plasticity and toughness of the welded joints. The high strength of the weld metal is reduced. When welding high-strength, low-carbon and low-alloy straight seam welded pipes, it is necessary to control the mass fraction of alloy elements and carbon elements in the weld. Therefore, when choosing welding materials, you need to ... Continue reading →
The difference between carbon steel seamless pipe and stainless steel seamless pipe mainly refers to the difference in design rules between stainless steel and carbon steel, which means that the design rules of these two types of stainless steel pipes cannot be used in common. These differences are summarized as follows: The design rules for stainless steel cannot be used for carbon steel because there are 3 fundamental differences between stainless steel and carbon steel: The difference between stainless steel and carbon steel 1: Stainless steel undergoes work hardening during cold working. For example, there is anisotropy when bending, that is, the transverse and longitudinal properties are different. The increased strength by cold working can be used, but if the bending area is small compared to the total area and this increase is neglected, the increased strength can increase the safety factor to a certain extent. The difference between stainless steel ... Continue reading →
1. Prevent drilling damage to the oil casing In order to prevent drilling damage to the casing pipe, two points should be paid attention to: (1) Petroleum casing with corresponding anti-corrosion performance should be selected according to the specific conditions at the bottom of the oil well; (2) Petroleum personnel should optimize the drilling design plan before drilling operations, so that relevant personnel can reduce the wellbore curve rate and reduce the stress change of the oil casing during the drilling operation, so as to ensure the quality of the drilling and prevent damage during the drilling process Oil Casing. 2. Optimize perforation technology to ensure cementing quality In the perforation operation, the relevant parameters of the perforation operation should be optimized first to improve the accuracy of the perforation process and avoid damage to the oil casing during the perforation operation. The relevant management personnel of the oil company should strengthen ... Continue reading →
Steel pipes are generally divided into seamless steel pipes and welded steel pipes according to the production method. This time we mainly introduce welded steel pipes, that is, seam steel pipes. The production of pipe billets (steel plates and steel strips) is rolled into required cross sections by various forming methods Tubes with surface shapes and sizes are then welded by different welding methods to obtain steel pipes. Compared with seamless steel pipe welded pipes, it has high product accuracy, especially high wall thickness accuracy, simple main equipment, and small floor space. Continuous operation in production and flexible production features. Welded pipes should be divided from the production process, which can be divided into three types: spiral submerged arc welded pipe (SSAW), longitudinal submerged arc welded pipe (LSAW), and electric resistance welded pipe (ERW). 1. The production process of spiral steel pipe (SSAW) is roughly as follows: The raw materials ... Continue reading →
ERW Casing, generally low-carbon microalloyed steel (coil) rolled by TMCP process, is formed and continuously welded into tubes by high-frequency resistance welding (ERW), with excellent technology and high production efficiency. In recent years, with the development of clean steel, continuous casting slab and low-carbon microalloyed steel plate controlled rolling technology, the emergence of ultra-pure steel provides greater support for the development of ERW casing in terms of raw materials, plus overall heat treatment The technologies originally used for seamless pipe rolling, such as thermal tension reduction, are used in the production of ERW casing, as well as the introduction of automatic control technology and multi-probe nondestructive testing technology. The quality of ERW casing is continuously improved. Its products are developing in a high-grade and diversified direction, and their performance is equal to or surpassing seamless pipes. Features of ERW casing: ... Continue reading →
Cold drawn erw pipe, which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard. After the electric resistance welded pipe is welded, the whole pipe body is normalized to ensure the homogeneity of the weld and the heat affected zone with the rest of the metallographic structure and mechanical properties; cold drawing and subsequent heat treatment (eliminating internal stress) and the steel pipe have good dimensions. And mechanical properties. After the welded steel pipe is processed by cold drawing and deep processing, a high-quality steel pipe with small dimensional tolerance and good mechanical properties is obtained. In addition, cold drawn welded pipes have significant advantages over cold drawn seamless pipes in ... Continue reading →
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