|Biography||I am a professional digital marketer and a content writer related to the steel pipe industry.|
|Member since||Mar 13, 2020|
What is high frequency welding? High-frequency welding is a new type of welding process that uses the skin effect and neighboring effect produced by high-frequency current to connect steel plates and other metal materials. The emergence and maturity of high-frequency welding technology is a key process in the production of ERW steel pipe. The quality of high-frequency welding directly affects the overall strength, quality level and production speed of welded pipe products. The basic principle of high frequency welding: The so-called high frequency refers to the frequency of the alternating current of 50Hz, and generally refers to the high frequency current of 50KHz to 400KHz. When high-frequency current passes through a metal conductor, two peculiar effects are produced: skin effect and proximity effect. High-frequency welding uses these two effects to weld steel pipes. So, what are these two effects? The skin effect means that when an alternating current of a ... Continue reading →
a) The following phenomena occur when the boiler tube is damaged 1. The water level of the boiler drops rapidly, the steam pressure and the feed water pressure decrease, and there is a noticeable noise when the boiler tube bursts. 2. There is a sound of steam ejecting in the combustion chamber and flue. 3. The negative pressure in the combustion chamber changes to a positive pressure, and furnace smoke is sprayed out of the furnace door. 4. The feed water flow rate is abnormally greater than the steam flow rate. 5. The exhaust gas temperature suddenly drops. 6. Unstable combustion of the boiler or cause fire extinguishing. b) Reasons when the boiler tube is damaged 1. The boiler inlet water is not deaerated, causing serious corrosion in the boiler tube. 2. The circulating water in the boiler tube vaporizes, causing a steam pocket in the tube, causing the tube wall to overheat, causing convex hulls and cracks. 3. The quality of boiler feed water does not meet the ... Continue reading →
In daily steel purchases, the most annoying thing is the purchase of low-quality seamless steel tubes, which affects product quality. How to identify low-quality seamless steel tubes? Let's take a look at the methods that can be used to identify high-quality seamless steel pipes and inferior seamless steel pipes with the naked eye: 1. Inferior quality seamless steel pipes are prone to scars. Mainly due to two reasons: (1) Inferior seamless steel pipes have many impurities and uneven materials. (2) Inferior pipe manufacturers have simple guide and guard equipment, which is especially easy to stick to steel, and the pipes containing impurities are prone to scars after biting into the roll. 2. Inferior quality seamless steel pipes are prone to pipe folding. The so-called folding refers to the various fold lines formed on the surface of seamless steel pipes. Such defects often run through the longitudinal direction of the entire product. The reason for the folding is that in ... Continue reading →
The quality assessment process of ERW steel pipe consists of online non-destructive testing, metallographic inspection, flattening and flaring destructive tests, and hydraulic tests. Evaluation process: 1. Online non-destructive flaw detection Rotate the detection arm of the flaw detection station and place it in the straight seam welded pipe production line, observe the position of the weld through the camera, adjust the front and rear positions of the probe with the operating lever, make the weld and the laser coincide, and save the parameters. Input the coil number of steel strip through DATASERVR and DACQ computer. Observe the waveform display on the flaw detection interface. When the waveform exceeds the alarm line, compare the thickness measurement information to determine whether it is a defect wave or interference wave signal, and visually inspect the pipe to see if the waveform exceeds the alarm line. If the waveform exceeds the alarm line, an alarm will be ... Continue reading →
The properties and functions of seamless steel tubes. When seamless steel tubes are made, different materials are used, and seamless steel tubes have different properties. For example, the most common seamless steel tubes in life are used in high-pressure boilers. The pressure and temperature of the high-pressure boiler are high. In this state, the seamless steel tubes are likely to be oxidized and corroded. Material and thermal processing technology have new requirements. Generally speaking, seamless steel tubes are required to have good compactness and corrosion resistance during use. Secondly, for the use and production of seamless steel tubes, there are generally certain requirements for its roughness. Depending on the place you want to use, it is necessary to clarify these conditions to determine which seamless steel tubes to be used for use. If you want to determine the quality of seamless steel tubes, whether they meet the standards you require, how to identify low-quality ... Continue reading →
The hydrostatic pressure test of oil casing pipe is an indispensable part of the steel pipe manufacturing process. Its function is to detect the leakage resistance of the steel pipe under the standard test pressure and the voltage stabilization time. Like radiographic, ultrasonic and other flaw detection techniques, it is an important means to inspect the overall quality of steel pipes. A popular description is a test in which the pipe is filled with water and tested under pressure to maintain the specified pressure without leakage or rupture. Its operation includes three steps of flushing, pressure test, and water control. The oil casing hydraulic testing machine can be used to detect the pressure resistance of the oil casing. It uses the form of a pressurized cylinder to pressurize. The pressurized form is fast, stable and reliable. It is equipped with automatic control technology to display water Pressure curve, input and output test statistics, and store test ... Continue reading →
Anti-corrosion technology of seamless anti-corrosion steel pipe: The production process of seamless anticorrosive steel pipes is relatively mature, and all kinds of anticorrosion can be produced. Among them, seamless anticorrosive steel pipes have outstanding performance advantages. The equipment usually used in the production of seamless anticorrosive steel pipes includes steel pipe buffering platform, pipe shifting unit, tractor, pipe-piercing machinery, high-pressure gun generator, repair platform, transmission line, steel pipe preheating furnace, shot blasting host and other equipment. The seamless anticorrosive steel pipe shall be applied to the inspection bench and the return transmission line of the unqualified steel pipe in the test. The application of these not only can obtain good insulation steel pipes, but also the product quality has passed strict inspections. The specific production process of seamless anti-corrosion steel pipes(astm a106 ) is to first ... Continue reading →
Straight seam steel pipe refers to a steel pipe whose weld seam is parallel to the length of the steel pipe. Its production process is relatively simple. The strength of spiral steel pipe is generally higher than that of straight seam steel pipe. It can produce welded pipes with larger diameters from a narrower blank, and can also produce welded pipes with different diameters from a blank of the same width, but compared with a straight seam welded pipe of the same length, the weld length is increased by 30%-100%. The production speed has slowed down. According to its production process, it can be divided into high frequency straight seam steel pipe (erw steel pipe) and submerged arc welded straight seam steel pipe (lsaw steel pipe). The submerged arc welded straight seam steel pipes are divided into UOE, RBE and JCOE steel pipes according to their different forming methods. For most forming methods, the last process is to expand the full-length diameter of the welded pipe blank again ... Continue reading →
Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is generally divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer refrigeration pipe, etc. The production process of straight seam steel pipe is simple, high production efficiency, low cost, and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can also be used to produce welded pipes with different pipe diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower. Can straight seam steel pipes be connected with certain materials? Is there a way to prevent the fracture of the straight seam steel pipe? Let me introduce to you. Although straight seam steel pipe ... Continue reading →
Straight seam welded pipes, steel pipes made of hot-rolled or cold-rolled steel plates or steel strip coils welded on welding equipment, are all called straight seam welded pipes. (The name is given because the welds of the steel pipe are in a straight line). Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Straight seam steel pipes can be divided into high-frequency straight seam steel pipes (ERW steel pipe) and submerged arc welded straight seam steel pipes (LSAW steel pipe) according to the production process. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. Description of the main production process of large diameter straight seam welded pipe: 1. Plate inspection: After the steel plate used to manufacture the large-diameter submerged arc welded straight seam steel pipe enters the production line, the full plate ultrasonic ... Continue reading →
Straight seam steel pipes are steel pipes whose welds are parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe and so on. Longitudinal welded pipe has simple production process, high production efficiency, low cost and rapid development. Spiral steel pipe is a spiral seam steel pipe made of strip steel coils as raw materials, often extruded and formed by automatic double-wire double-sided submerged arc welding. The spiral steel pipe feeds the strip steel into the welded pipe unit. After rolling by multiple rollers, the strip steel is gradually rolled up to form a round tube blank with an open gap. The reduction of the squeeze roll is adjusted to control the weld gap at 1~ 3mm, and make both ends of the welding joint flush. Features of straight seam steel pipe: The LSAW steel pipe adopts double-sided submerged arc welding welding technology, ... Continue reading →
Seamless steel pipes for boilers are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes used to manufacture high-pressure and above-pressure water-tube boiler heating surfaces. These boiler tubes are often working under high temperature and high pressure, and the tubes will be oxidized and corroded under the action of high temperature flue gas and water vapor. Therefore, the steel pipes are required to have high durability, high oxidation resistance, and good organization stability. Industrial boiler pipes are mainly seamless steel pipes, because the performance indicators of seamless steel pipes can fully meet the requirements of boiler applications. Although the cost is high, its safety and reliability are high. Welded steel pipes are generally used as low-pressure fluid delivery pipelines within 2Mpa. High-temperature and high-pressure equipment like industrial boilers must use seamless steel pipes, and the thickness of the ... Continue reading →
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 →
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