Q235B welded steel pipeSee more

Continuous pipe products are widely used in petroleum, chemical industry, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects. The detection of thick wall continuous pipe is mainly ultrasonic flaw detection. The longitudinal weld of the same barrel section of thick wall continuous pipe shall not exceed two passes. The butt weld of thick wall continuous pipe shall be flush with the. When the nominal diameter is larger than, back sealing welding shall be carried out in the pipe. In the process of pipe rolling, Q235B rolling, Q345B rolling, large diameter thin wall rolling, large diameter thick wall rolling, stainless steel rolling, L360 rolling and 16Mn rolling were analyzed. Professional hot rolled steel pipe, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe steel casing, large quantity, excellent quality and low price, fire resistance - Waterproof - high temperature resistance, strong and durable, safe and reliable

Thick wall coiled pipe is a kind of familiar steel. It is widely used in construction and pipeline industry because of its durable performance and excellent quality. Have we known about the packaging process of the frequently used steel? With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting are gradually recognized. NC cutting not only greatly improves the rate of plate and product quality, but also improves the working environment and labor efficiency. At present the NC cutting machines used in the thick wall coil processing industry are mainly flame and ordinary plasma cutting machines, but pure flame cutting can not meet the needs of modern production. At present, most NC cutting machines are NC plasma cutting machines. This type of cutting machine can meet the needs of thick wall coiled pipe plate processing and thick wall coiled pipe parts processing, so the demand will be greater and greater but there is still a very obvious gap with foreign countries, which is mainly reflected in: 90% of the developed thick wall coiled pipe processing industry is digital control cutting machine, and only 10% is manual cutting; The CNC cutting machine only accounts for part of the total blanking. 10%, of which the proportion of NC plasma cutting is small. Professional hot rolled steel pipe large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory to ensure quality, service and quality. Your satisfaction is our pursuit! Welcome to inquire. In industrial production, thick wall coil thermal cutting generally includes gas cutting, plasma cutting, laser cutting, etc. Among them, plasma cutting has a wider cutting range than gas cutting More efficient. Fine plasma cutting technology is close to laser cutting in material cutting surface quality, but the cost is much lower than laser cutting. Therefore, since the successful development of the United States in the mid-1950s, plasma cutting has developed rapidly. With the rapid development of computer and digital technology, NC cutting is also developing, which improves the machining accuracy. Save materials

.The welding method of welded steel pipe is submerged arc welding; Molding process, forward swing intermittent production; Unit speed,Q235B straight seam welded pipe, 0.5 -- 3m / min; Welding speed 0.5 -- 3m / min. The unit is composed of uncoiler, straightener, centering device, hydraulic shear, milling welding machine, disc shear, edge milling machine, plate surface cleaning equipment, delivery machine, plate edge pre bending equipment, forming machine, internal welding, external welding, flash, pulling out, slag pouring, repair welding, flat head chamfering, hydraulic inspection, finished product inspection and degreasing collection. The whole process of submerged arc welding of spiral steel pipe is as follows: the principle of spiral steel pipe submerged arc welding: submerged arc welding is welded with arc heat energy. The difference from manual electrode arc welding is that the welding wire of submerged arc welding is, the arc is under the flux. For welding wire and workpiece, when the start button is pressed, the welding wire and workpiece are energized, the welding wire is pulled back, the arc is ignited, the welding trolley moves forward, and the welding wire is continuously transported downward to maintain the arc under the flux layer and form a welding pool under the arc. Around the arc, the flux melts to form a cavity. The cavity and molten pool advance continuously, and the metal behind the molten pool solidifies to form a continuous weld. This process is carried out under flux, so we can't see it. It can be seen by means of X-ray photography. Because the spiral steel pipe adopts the welding technology of submerged arc automatic welding, in addition to this, the production efficiency is high; The auxiliary time of production is less, which saves the time of electrode replacement; The welding conditions are clean, saving the cleaning time; High weld quality. It also provides necessary conditions for the delivery of spiral steel pipe factory, so that the production time of large amount of spiral steel pipe can be guaranteed, so it is still widely used.

Welding voltage because the welding arc is conical, and the welding voltage directly affects the length of the arc. Therefore, with the increase of welding voltage, the arc length increases, the moving range of arc spots expands, the weld pool widens, and a wider weld formation will be obtained. If welding is carried out in a horizontal position, it will only change the width of the weld without affecting the edge transition of the weld. However, the external welding of spiral welded pipe is carried out on the slope, and the molten weld metal will flow laterally under the action of gravity. It can be seen that the larger the welding voltage and the wider the weld pool, the more serious the trend of lateral flow of weld metal, * eventually leading to the bias flow of weld metal. Coil products are not only rich in types, but also diversified in processing technology and molding. In most cases, after forming, the next process is to expand the diameter of the welded pipe blank to improve the quality of welded pipe shape. In other words the expanding process has become an important process to ensure the quality of finished pipe in the production of large-diameter straight seam coiled pipe.

.Generally, wrapping, sealing and other processes, as well as related pre and post processes such as cleaning, stacking and disassembly. Because it is used strictly, the process of thick wall rolling pipe shall be strict, and the production shall be carried out according to the correct methods and principles. In addition, the process of thick wall rolling pipe also includes stamping on the package. The use of mechanical packaging products can improve productivity, reduce labor intensity and meet the needs of large-scale production. Thick wall coiled pipe is developed with the emergence of new packaging materials and the continuous innovation of packaging technology. It can show important value in different industries and fields.

High. Hot rolled thick wall coiled pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller etc.

Generally, the wall thickness of the rolled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled,Q345B large diameter welded pipe, welded, formed, butted and rolled directly from the steel plate. It has the advantages of short processing time, fast delivery and low cost. The rolled pipe is mainly used for hot-rolled thick wall coils such as pipes, forming, deburring, defect detection and delivery. Sometimes the wall thickness is relatively thick and secondary heating is required. The feature is that the outer diameter tolerance is small Uniform wall thickness. It is important that the hot rolled thick wall coil will not damage the properties of raw materials. The disadvantages of hot roll thick wall rolling pipe are long processing time and. Hot rolled thick wall coils are widely used: cylinder, hydraulic, roller table, etc.

The main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally, cold rolled sheet can be used for pipe rolling, and the product standards are GB / t50205-200, GB / t3092-2001, etc. Continuous pipe is widely used in petroleum chemical industry, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects.

Adopt external control or internal control roll forming.

For external welding, a larger welding current is used. However, under the condition of high welding current, and the melting amount of welding wire increases accordingly, resulting in the increase of weld reinforcement, the deterioration of weld formation and poor edge transition.

Promise and keep promise.The inspection requirements for thick wall coiled pipe treatment are that the thick wall coiled pipe is made of steel plate. The thick wall coiled pipe can be divided into coiled pipe and hot rolled thick wall coiled pipe. Generally, the production process of thick wall coiled pipe can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipe is generally more complex than hot rolling. Roll sizing test shall be carried out for the pipe blank first. If the surface does not respond to the crack, when entering the annealing process, acid shall be used for annealing, and attention shall be paid to whether a large number of bubbles are generated on the surface. If a large number of bubbles are generated, it indicates that the quality of steel pipe can not meet the response standard. In appearance,Q345B welded pipe, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe, and its wall thickness is generally smaller than that of the hot-rolled seamless steel pipe, but the surface is brighter than that of the thick wall seamless steel pipe. There is not too much roughness on the surface, and there are not too many burrs in the diameter. The thick wall coiled pipe is a powerful manufacturer, quotation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications,. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, welded, formed, butted, removed and reinforced directly from the steel plate. Coil processing time is short and delivery is fast.

The function of parameters of pipe rolling equipment is improved by 30% which fills the gap that can not be produced by traditional steel rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 4-100mm. The main materials are q23q3420, 435cimo and 42cimo 16 manganese and 16 manganese capacity. Generally speaking, cold-rolled sheet can be used for pipe rolling. Product standards: GB / t50205-200, GB / t3092-2001, etc.

After, we should prevent the surface damage of the plate. The parts with serious scars must be grinded to make transition, and the wall thickness of the grinded part shall not be less than the design wall thickness. Steel rolling pipe is an unconventional pipe, and there is no domestic standard at present. Therefore, the inspection is mainly aimed at the thickness and weld quality.

The steel plate rolling pipe we call the steel plate rolling pipe is actually a process. The following small series will describe the process sequence: plate inspection, blanking, beveling, steel plate rolling, assembly spot welding, campus, perimeter and roundness deviation inspection, welding, weld inspection, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory and other special products, old brands, price advantages and guaranteed quality. These processes can not be less.

Trustworthy.Profiled seamless steel pipe is the general name of API seamless steel pipe with other section shapes except circular pipe. According to the shape and size of steel pipe cross section, it can be divided into profiled seamless steel pipe with equal wall thickness (code D), profiled seamless steel pipe with unequal wall thickness (code BD) and profiled seamless steel pipe with variable diameter (code) Special shaped seamless steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with circular pipe, special-shaped pipe has large moment of inertia and section modulus, and has large bending and torsion resistance, which can greatly reduce the structural weight and save energy

How is the strength grade of thick wall coiled pipe specified?

The pipeline installation sequence is based on the principle of sub area and sub system, with small diameter, from the lower layer to the upper layer, from difficult to easy, the pipeline connected with the machine is configured from the inside to the outside to reduce the impact of welding stress on the installation accuracy of the machine. The interface between indoor and outdoor pipelines shall be left outdoors. Q345B thick wall coiled pipe is a kind of material in carbon steel and is widely used. The thickness of Q345B thick wall coiled pipe is generally more than 10mm which is widely used in drainage engineering, sewage pipeline, dredging pipeline, etc. Q345B thick wall coiled pipe is a welded pipe product, and the process in the welded pipe is relatively simple and flexible. This type of steel pipe usually has no inventory and is processed by user. If the quantity is small, the raw materials are not good. The main problem of Q345B thick wall coiled pipe is welding. As long as it is possible, the delivery related requirements can be compared with other products.

.: 90% of the developed thick wall coil processing industry is CNC cutting machine, and only 10% is manual cutting; The CNC cutting machine only accounts for part of the total blanking. 10%, of which the proportion of NC plasma cutting is small. In industrial production, the thermal cutting of thick wall coiled pipe generally includes gas cutting, plasma cutting, laser cutting and so on. Among them, plasma cutting has a wider cutting range than gas cutting More efficient. Fine plasma cutting technology is close to laser cutting in material cutting surface quality, but the cost is much lower than laser cutting. Therefore, since the successful development of the United States in the mid-1950s, plasma cutting has developed rapidly. Professional hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory, high pressure rating, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection and long service life. With the rapid development of computer and digital technology, NC cutting has also expanded and improved the processing accuracy. It shows great advantages in saving materials and improving labor productivity. This leads to the development of plasma cutting technology from manual or semi-automatic to NC, which has become one of the main directions of NC cutting technology. NC plasma cutting technology is a set of high-tech technologies such as NC technology, plasma cutting technology and inverter power supply technology. Its development is based on the common progress of computer, plasma arc characteristic research, power electronics and other disciplines. The CNC cutting technology began in the 1980s, and the CNC plasma cutting technology was later. However, recently, some domestic universities, narrowing the gap of foreign advanced technology. The large-scale rolling pipe factory of rolling pipe, t-welded rolling pipe, flaw detection welding rolling pipe, 16Mn rolling pipe, Q345B rolling pipe and special-shaped rolling pipe, and the t-welded rolling pipe, 16Mn rolling pipe, Q345B rolling pipe and special-shaped rolling pipe produced by the rolling pipe factory are exported to major engineering buildings at home and abroad.

The diameter of thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. The reason why this happens is mainly due to the problems of raw materials and equipment processing. The steel plate with the required width of welded pipe required by the customer is usually not produced by the steel plant, so two plates need to be welded, so the weld will occur.

The influence of welding process parameters on welding current mainly includes two aspects: according to the production characteristics of spiral steel pipe, small welding current is usually used for internal welding