Finish machining is performed below, and after shot peening, the scales on the inner and outer surfaces of the elbow are removed, and both ends are processed with grooves to facilitate welding.
The process of thick wall straight seam coiled pipe is generally rolled. If the diameter required by the customer is particularly large, it is difficult for general machinery and equipment, so it is necessary to use coiled pipe. First, after the steel plate is rolled, then weld the two rolled steel pipes. The weld is also called T-welding. Sometimes, the large diameter thick wall straight seam steel needs to roll and weld the two steel plates Therefore, there may be two welds on a pipe body, also known as double welds. Thick wall straight seam coiled pipe has a wide range of materials. As long as it is a steel plate that can be ordered in a steel plant, it is basically OK. The main problem of the product is the welding quality. The welding quality directly determines the quality of the product, which is the main step in the thick wall rolling pipe. It is suitable for columns for bearing steel structures such as buildings, bridges, dams and offshore platforms, super long-span building structures and electric pole tower and mast structures requiring wind resistance and earthquake resistance.
.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, 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.
Weld size has a great influence on the quality of rolled steel pipe. Weld size mainly includes welding process parameters, welding wire shape and position parameters, flux flow, flux process performance and weld forming.
.Sealing and sealing shall be carried out in the pipeline. The wall thickness of general coiled pipe is 20mm and the outer diameter is 450-3000mm. The production process of general thick walled coiled pipe can be divided into cold drawing and hot rolling directly from the production process of steel plate rolling and general thick walled coiled pipe. 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 there is no response crack on the surface, the round pipe shall be cut by cutting machine and cut into a 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, 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,. Welding, forming, with short processing time, fast delivery and low cost, are mainly used for hot-rolled thick wall coils such as pipes, billboard and columns. The thickness of hot-rolled thick wall coils is generally greater than 20mm and the outer diameter is 450-3000mm. The hot-rolled thick wall coils are rolled under the heating of steel plates Welding, 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. Professional hot-rolled steel pipe, large-diameter thick wall coil, thick wall straight seam coil, steel casing coil factory inspection is strict, quality assurance. Preferential activities are in progress, welcome to consult. Hot-rolled thick wall coil is widely used: cylinder block, hydraulic pressure, bridge, roller table, etc.
Steel plate materials mainly include Q235, Q345, 20, 45, 35cimo and 42cimo, with 16 manganese and 16 manganese capacity. Generally, cold rolled plate can be used for pipe winding. Like oil, chemicals natural gas transportation, piling and urban water supply, gas supply and other projects can be customized! The required thickness and length can be adjusted as required! The rolling pipe weld is a double-sided weld. Two longitudinal welds are allowed, and the weld spacing exceeds 300 mm. The welding appearance and quality standard shall not be lower than the level standard in the welding specification.
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, 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.
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 expanding process has become an important process to ensure the quality of finished pipe in the production of large-diameter straight seam coiled pipe.
Executive standard for steel plate rounding: structural tube gb8162-2008 fluid tube gb8163-2008 low and medium pressure boiler tube gb3087-2008 high pressure boiler tube GB5310-2008 special tube for chemical fertilizer GB 79-2000 petroleum cracking tube gb9948-88 steel plate rounding production process: tube blank & mdash& mdash; Inspection & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Grinding & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash;& mdash;& mdash; Pickling and passivation & mdash& mdash; Inspection & mdash& mdash; Cold rolling & mdash& mdash; Degreasing & mdash& mdash; Cutting head & mdash& mdash; Air drying & mdash& mdash; Internal polishing & mdash& mdash; External polishing & mdash& mdash; Inspection & mdash& mdash; Identification & mdash& mdash; Process flow inspection of finished product packaging industrial pipe & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Mushroom trimming & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash; Solution treatment & mdash& mdash; Pickling & mdash& mdash; Pickling and passivation & mdash& mdash; Formula of steel plate rolling weight: [(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter)
The misalignment of butt weld of coiled pipe shall not exceed 20% of wall thickness and shall not exceed 2mm. Butt joint of two pipes with small adjacent deviation value.
quality standard.The process of heating the whole thick wall coil or welding area before welding is called preheating. For the steel with high welding strength grade, it has hardening trend, especially good thermal conductivity, weldment and large thickness. When the ambient temperature around the welding area is too low, it is necessary to preheat the weldment before welding.
The wall thickness of coiled pipe like coiled pipe is under 20mm and the outer diameter is 450-3000mm. It is made of steel plate by direct rolling, welding, forming, butt joint and rebar removal. Coil pipe has the characteristics of short processing time, rapid delivery and low cost. The rolling pipe is mainly used for pipes, billboards, etc.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
In short, hot rolled steel pipe is a special thick wall steel pipe rolled with steel plate under heating conditions. Here, hot coiling refers to heating to coil the steel plate. Its meaning shall be determined with cold rolled steel pipe.
Online consultation.Since the groove sizes of longitudinal and circumferential joints of hot-rolled pipes are different, it is necessary to confirm whether the inner side is upward before plate rolling to ensure the correctness of groove direction.
A series of water conservancy projects such as sand discharge, mud transportation, dredging and hydraulic reclamation. It is generally believed in the dredging industry that spiral pipe is the Zui best pipe for long-distance water conveyance and solid-liquid mixed transportation projects. The sand and mud discharge pipeline products produced by Hebei Xinghao pipeline industry have been used by hundreds of customers in China. Flange welded spiral steel pipe is widely used in long-distance water supply and drainage in various environments and exported to Japan. The connection is completed by adding flange gasket and fastening it with bolts. Some pipe fittings and equipment have their own flanges, which also belong to flange connection.
With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting are gradually recognized. It has long provided various brand products such as hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing and rolling pipe factory. The designated products are complete and the quality is guaranteed. 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. In industrial production, laser cutting and so on. Among them plasma cutting, 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, recently, 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.
.The continuous pipe has good characteristics and performance in use, and advanced technology is adopted. If we want to make progress and enhance competitiveness we must have a good opportunity at present. Just like the development of the iron and steel industry, although the pipe rolling industry has made remarkable achievements in recent years, accounting for more than 1 / 4 of the world's output, there is still a certain gap with the international advanced level in terms of technical equipment product quality and product grade, enterprise economic scale and main technical and economic indicators. The coil adopts PLC automatic system, and each part is operated on the panel. The cutting length of winding tube adopts photoelectric induction, accurate positioning and automatic cutting. Each process adopts double pump oil pressure system to ensure stable operation. The pipe rolling has different application ranges: winding pipe length: 0-1400mm, winding pipe thickness: 2-15mm, winding pipe diameter: 20-200mm, purpose: 3 inches x24x, working voltage: 380V, 50Hz. It can be used according to the specified parameters and scope, so as to ensure that it can play an important role and value in use. Large coil is durable, stable and easy to operate. The packaging process of coil includes filling, packaging, sealing and other main processes, as well as relevant pre and post processes such as cleaning, stacking and disassembly. In addition, the rolling process also includes measuring or stamping on the package. Using mechanical packaging products can improve productivity, reduce labor intensity, meet the needs of large-scale production and meet the requirements of cleanliness and hygiene. With the emergence of new packaging materials and the continuous innovation of packaging technology, spiral pipe can play an important role and value in different industries and fields.
The distance between the two longitudinal slits of the reel group shall be greater than 100mm. The outer wall of the branch pipe shall be longitudinal, and the circumferential weld shall not be less than 50mm.
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, the rolling quality of pipe, 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, rolling pipe factory, large quantity, excellent quality and low price, fire resistance - Waterproof - high temperature resistance, strong and durable, safe and reliable