The volume of coiled pipe, Q235B coiled pipe, Q345B coiled pipe, large-diameter thin-wall coiled pipe, large-diameter thick wall coiled pipe, stainless steel coiled pipe, L360 coiled pipe, 16Mn coiled pipe and other special products have increased accordingly. With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting have been gradually recognized. NC cutting not only greatly improves the rate of plate and product quality, 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. 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. With the rapid development of computer and digital technology, NC cutting is also developing, which improves the machining 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, some domestic universities, research institutes and manufacturers have studied NC plasma cutting technology and gradually developed and produced various specifications of NC plasma cutting equipment narrowing the gap of foreign advanced technology. 20 old brands, price
Circumferential deviation of coiled pipe, pipe groove processing and joint pair: when the pipe wall thickness is less than 6mm, it is type I weld; when the pipe wall thickness is greater than 6mm, it is type V weld; For pipes with diameter greater than 600mm and wall thickness greater than 6mm, the bottom of the pipe shall be sealed at the bottom of the pipe; In addition to the lap joint, the other type of gas coil pipe is continuous and solid V-groove butt welding. If the weld is found to be defective, the weld must be re welded. Rewelding shall not be more than twice. Long term supply of hot rolled steel pipe, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory has complete products and excellent quality, The price is favorable. The longitudinal weld of the winding pipe with the same cylindrical part shall not be greater than the spacing between two longitudinal joints shall not be less than 200mm. The arc length of the winding pipe calibration template shall be 1 / 6 ~ I of the circumference of the pipe / the gap between the template and the pipe. Let me introduce the steel plate production standard winding pipe. During the winding process, the surface of the circuit board shall be protected from damage. Parts with severe scars shall be ground to achieve transition, and the wall thickness of the ground part shall not be less than the design wall thickness.
.Purchasing standards for steel plate coils in the steel market, steel plate coils are popular. What purchasing standards do some users have when purchasing such steel plate coils? The following year old Xiaobian, because steel plate coil plays an important role in construction, railway construction and bridge construction, its quality standards are also more important. If it is for quality solution, it is easy to have an impact. Generally, we can purchase from these aspects.
Thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. Why does this happen mainly because of raw material problems and equipment processing problems? 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 main problem of thick wall coiled pipe is welding. As long as flaw detection can be carried out, the requirements related to delivery are wider than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector. The longitudinal weld on the same cylindrical part of the coiled pipe shall not be greater than 2. When the coil pipe is butt welded, the corresponding parts shall be flushed to. When the nominal diameter is larger than the inner seal, the bottom seal welding shall be carried out. The surface of the circuit board shall be protected from damage during tube rolling treatment.
.The quality of steel rolling pipe is greatly affected by the size of weld, mainly including welding process parameters, shape and position parameters of welding wire, flux flow, flux process performance, forming joint and other comprehensive factors.
The rolling pipe factory mainly produces steel plate rolling pipe and thick wall rolling pipe. With the development of domestic economic situation and the acceleration of welding and casting trend, the advantage of NC cutting is 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 CNC cutting machines used in the thick wall rolling pipe 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 CNC cutting machines are CNC 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, but there is still a very obvious gap with foreign countries mainly in
For external welding, a larger welding current is used. However, under the condition of high welding current, the stirring effect of molten pool is enhanced, 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.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
Mixed alloy (eutectic mixture): when the liquid alloy solidifies, Qinhuangdao thick wall steel plate coil, the alloy formed by the crystallization of each component of the alloy, such as solder, bismuth cadmium solid melt alloy, and the alloy forming solid solution when the liquid alloy solidifies, such as gold and silver alloy; Many properties of alloys are better than pure metals, so alloys are mostly used in applied materials. The formation of alloys often improves the single element
However, the disadvantages of manual cutting and cutting are also obvious, and the quality of the incision is very poor Big size error There is a great waste of materials The post-treatment process has large processing capacity and poor working conditions. Cutting with a forming machine can greatly improve the quality of the workpiece, but the workpiece must be pre machined. It is not suitable for blanking of single chip, small batch and large workpiece. Although the semi-automatic cutting machine reduces the labor intensity, its function is simple and is only suitable for cutting two shapes. Due to the low cost of equipment, the above cutting is easy to operate compared with CNC cutting Easy to operate, Q19 q23 q34 16Mn, two or more steel pipes must be connected. Therefore, the process of this welded pipe is flexible, convenient and applicable. The disadvantage is that it can not be produced by mechanized line. The level of automation and mechanization is not high, which requires a lot of manual processing. The main problem of coiled pipes is welding. Thick wall coiled pipes can be delivered as long as they can be inspected by flaw detection. The relevant requirements are broader than other products.
The wall thickness of hot coil thick wall continuous pipe is generally greater than 20mm, and the outer diameter range is 450-3000mm. Hot rolled thick wall continuous pipe is rolled, welded, formed,Q235B thick wall coiled pipe, reinforced, flaw detected and delivered under the condition of steel plate heating. Sometimes the wall thickness is very special and needs secondary heating. It is characterized by small outer diameter tolerance and uniform wall thickness. The main reason is that the hot rolled thick wall continuous pipe will not damage the performance of raw materials. The disadvantages of hot rolled thick wall continuous pipe are long processing time and high cost. Hot rolled thick wall pipe is widely used: oil cylinder, hydraulic, bridge, roll, etc. Compared with seamless steel pipe, thick wall continuous pipe has the disadvantages of low cost, fast delivery, breaking the fixed specification of seamless steel pipe and so on. Thick wall coil is welded by bending steel plate or steel strip. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. It can be divided into ordinary welded pipe, galvanized welded pipe, oxygen blowing welded pipe wire sleeve, metric welded pipe,Q355b large diameter welded pipe, idler pipe deep well pump pipe, automobile pipe, transformer pipe, welded thin-wall pipe, welded special-shaped pipe and spiral welded pipe. It is a special product manufacturing enterprise integrating research, development and service. It has long been specialized in hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, and is reformed on the basis of the same specification and model of traditional rolling equipment. The function of parameters of coil welded steel pipe equipment is improved by 30%, which fills the gap that can not be produced by traditional rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 8-100mm. The main materials are q23 q34 20 16Mn, 16Mn, etc. the product standards are GB / t50205-200, GB / t3092-2001, etc. the products are widely used in petroleum, chemical industry, natural gas transmission, pile driving, urban water supply, heating, gas supply and other projects.
Due to the continuous application of thick wall coiled pipe in industry and the continuous expansion of its scope it has many advantages. In order to prevent the thick wall coiled pipe from rusting, we can apply antirust oil on the surface of the thick wall coiled pipe.
The wall thickness of general coiled pipe is 20mm and the outer diameter is 450-3000mm. It is made of steel plate by direct rolling, welding and forming. The production process of general thick walled 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 pipe blank first. If there is no response crack on the surface, the round pipe shall be cut by cutting machine, Cut into blanks about meters in length. However, 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, 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, quotation, honest operation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications,. Docking and strengthening. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, billboards, columns, etc.
Quality documents.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, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects.
The welding method of welded steel pipe is submerged arc welding; Molding process, forward swing intermittent production; Unit speed, 0.5 -- 3m / min; Welding speed, 0.5 -- 3m / min. The unit is composed of uncoiler, 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,20# reel, 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, and there is no coating on it. The flux of submerged arc welding is pre laid at the place to be welded. In the flux of submerged arc welding wire, 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.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
.Welding voltage because the welding arc is conical, and the welding voltage directly affects the length of the arc. Therefore, 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, the round pipe shall be cut by cutting machine to cut the blank with a length of about meters. However, 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, 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, honest operation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications,. With the increase of welding voltage, 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. We specialize in providing hot-rolled steel pipes, large-diameter thick wall coils, thick wall straight seam coils, steel casings and quality assurance of pipe rolling factory. New and old customers are welcome to consult during the preferential activities. It can be seen that the larger the welding voltage is, the wider the molten pool is, the more serious the trend of lateral flow of weld metal will be, * which will eventually lead to the bias flow of weld metal.
API seamless steel pipe is expressed as outer diameter, which is mainly used for machining, coal mine hydraulic steel and other purposes. Classification of thick wall seamless steel pipe & mdash& mdash; Hot rolled thick wall seamless steel pipe, cold drawn thick wall seamless steel pipe cold rolled thick wall seamless steel pipe, thick wall seamless steel pipe, stainless steel seamless steel pipe for pipe jacking structure (GB / t14975-199) are widely used in corrosion-resistant pipes and structural members in chemical, petroleum, light textile, food, machinery and other industries, and stainless steel hot rolled (,) and cold drawn (rolled) Seamless stainless steel pipe for fluid transportation (GB / t14976-199) is a hot-rolled (extruded) and cold drawn (rolled) seamless steel pipe made of stainless steel for fluid transportation.
In the production process, the hot-rolled steel pipe has the characteristics of no raw materials, the mechanical properties of thick wall steel plate. In this way the steel plate is heated first and then rolled, which softens the steel plate under great conditions, which will not affect the material quality, nor damage the properties such as strength, the specification and model of thick wall steel pipe are added.