When the nominal diameter is greater than or equal to 600mm, back welding shall be carried out in the pipe.
The pipeline installation sequence shall be adopted according to the principle of zoning and subsystem. First the lower level, then the upper level, and then the difficulty. In principle, the pipes connected to the machine are arranged from inside to outside to reduce the impact of welding stress on the installation accuracy of the machine. The joints of indoor and outdoor pipes shall be left outdoors. Q345B thick wall continuous pipe is a widely used carbon steel material. Q345B thick wall continuous pipe with thickness greater than 10mm is widely used in drainage engineering, sewage pipeline, dredging pipeline, construction pipeline, etc. Q345B thick wall continuous pipe is a welded steel pipe product with relatively simple and flexible process. This kind of steel pipe is usually not in stock and is customized. If the quantity is small, the raw materials are not good. The main problem of Q345B thick wall continuous pipe is welding. As long as possible, delivery related requirements can be compared with other products.
.Purpose of steel plate rolling: steel plate rolling is mostly used in large-scale steel structure construction as the main support part, such as bridge piling, seabed piling and high-rise building piling. Its material: Q345C. Q345D and Q345E are also used in low temperature areas.
When the pipe is rolled, and the distance between the outer wall of the outer branch pipe 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 wall thickness of two cylinders should not exceed two. The butt weld of thick wall continuous pipe shall be flush with the. When the nominal diameter is larger than, 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. The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate.
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, bridges, dams and offshore platforms, 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 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. 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.
The pipe volume is huge, the production site environment is complex, and the measurement cannot pass through the lower support bench of the steel pipe. This operation is convenient and the measurement accuracy is within & plusmn; Within 10mm, repetition accuracy ≤ 5mm. Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and hot-rolled thick wall coiled pipe.
031 inspected 8517611 standard, and then made by high-frequency welding and submerged arc welding. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. According to the purpose, it is divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, transformer pipe, electric welded thin-walled pipe, electric welded special-shaped pipe and spiral welded pipe, coil, Q235B coil, Q345B coil, large-diameter thin-walled coil, large-diameter thick-walled coil, stainless steel coil L360 coil and 16Mn coil, Quality. Preferential activities are in progress. Welcome to consult. Large diameter welded pipe, etc. According to the purpose, it is divided into seamless steel pipe for structure; Seamless steel pipe for transportation; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; Seamless steel pipe for geological brick exploration; Seamless steel pipe for petroleum brick exploration; Seamless steel pipe for petroleum cracking; Seamless steel pipe for ships; Cold drawn cold rolled precision seamless steel pipe; Various seamless steel pipes expressed as outer diameter, wall thickness and thick wall are mainly used for machining, coal mine, hydraulic steel, etc.
The production process of thick wall welded pipe can be divided into cold rolling, cold rolling and hot rolling. The steel pipes are made of 10, 20, 35 and 45, which are referred to as ordinary steel pipes for short, and 16Mn is between ordinary steel pipes and alloy steel pipes. This material is called low alloy steel pipe, the steel pipe materials are 27SiMn, 12Cr1MoV, 10crmo9, and the stainless steel pipe is collectively referred to as alloy steel pipe. According to the use, it is divided into structural seamless steel pipe; Seamless steel pipe transportation; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; High pressure seamless steel pipe for fertilizer equipment; Seamless steel pipe for geological exploration; Jointed steel pipe; Seamless steel pipe for petroleum cracking; Marine seamless steel pipe; Cold drawn cold rolled precision seamless steel pipe; Various alloy pipes.
Installation materials.Deviation reel as follows (unit: mm): nominal diameter & amp; amp; lt; 800 800 to 1200 1300 to 1600 1700 to 2400 2600 to 3000 perimeter Deviation & plusmn; 5± 7± 9± 11± The ovality is 1% of the outer diameter, and the quality of no more than 4 steel plate coils is greatly affected by the weld size, mainly including the comprehensive factors such as welding process parameters, welding wire shape and position parameters, flux process performance and formed joint.
Thickness detection thickness detection is very simple, as long as the caliper is OK. Like other pipes.
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
Main technical measures for low hardening trend
Discount.Electric fusion connection: when the pipe fittings leave the factory, the resistance wire is buried in the pipe fittings to make electric fusion pipe fittings. At the construction site, only the plug of the special welding instrument and the socket of the pipe fittings need to be connected. The inner body of the pipe fittings melts the outer plastic of the pipe fittings and the inner plastic of the pipe fittings to form a reliable connection, and combines the timing methods such as special digital timekeeper and installation indicator hole.
Large diameter steel plate rolling pipe large diameter steel plate rolling pipe value large diameter steel plate rolling pipe is made of 16mm thick wall rolling pipe, adopts advanced technology, has good use characteristics and performance in use, and can show important value and function. It can wind the steel strip with appropriate quantitative and wide width into a parallel winding pipe with the required inner diameter and wall thickness; The roller is driven by active stepless speed regulation, with small mandrel deformation, large pressure, strong winding force, high power transmission efficiency, good winding strength and flat appearance; With self-locking function, Q345 large-diameter steel plate coil for bridge can be automatically locked without shaking after adjusting the swing arm angle; With automatic cutting device, the incision is neat without warping angle, and the cutting length is adjustable. To operate by two people. 16mm thick wall coiled pipe is durable in use, stable in performance and easy to operate.
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.
.The latter stage is called unloading regression. At this time, the sector continues to retract from the circumferential position of the rewind pipe before rewinding, and will eventually reach the initial expanding position, which is the small shrinking diameter of the sector required by the expanding process. In practical application, in the process simplification, which has no impact on the expanding quality of steel pipe. How to calculate the weight per meter of steel coil? Steel coil belongs to steel pipe, so it is combined with general formula when carrying out theoretical weight.
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 so even in some large enterprises, it is still widely used in small and medium-sized enterprises.
API seamless steel pipe is expressed as outer diameter, wall thickness and thick wall seamless steel pipe, 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 rolled thick wall seamless steel pipe, cold drawn 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, 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.