The steel plate or strip is bent and then welded to form a thick wall coil. According to the welding form, it is divided into straight seam welded pipe and spiral welded pipe. It is divided into ordinary welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, rolling pipe, deep well pump pipe, automobile pipe, transformer pipe, welded thin-wall pipe, welded pipe and spiral welded pipe. Coil pipe is dedicated to the production of, longitudinal ring coil pipe and steel pressure pipe, and is modified according to similar specifications of traditional rolling equipment. The function of increasing the parameters of spiral steel pipe equipment by 30% fills the gap that the original traditional rolling equipment can not produce. It can produce steel pipes with a diameter of 400 or more and a wall thickness of 8-100mm. The material mainly includes q23 q34 20#,Q235B thick wall welded pipe, 16 manganese, 16 manganese capacity, etc. Product executive standards include: GB / t50205-2001, GB / t3092-2001, etc. The products are widely used in petroleum, chemicals, natural gas transportation, pile driving, urban water supply, heating, gas supply and other projects.
Generally, the production technology of thick wall coil can be divided into cold drawing and hot rolling. The production process of cold rolled thick wall coil is generally more than that of hot rolling. The pipe blank must first be tested by roll sizing. Assuming that the surface does not take care of the crack the round pipe should be cut by cutting machine. Sometimes there are two welds in thick wall coil. Why does this happen? It is mainly because of the problems of raw materials and materials Equipment processing problem. The steel plate with the required width of the welded pipe required by the customer is generally not produced by the steel plant, so the two plates must be welded, so this kind of weld occurs. The main problem of thick wall coiled pipe is welding. As long as the flaw detection can be carried out, the delivery can be carried out. The relevant requirements are broader than other products. The detection of thick wall coiled pipe is mainly For the ultrasonic flaw detector, the longitudinal weld on the same cylinder section of the coil pipe should not be more than two. The group of the butt weld of the coil pipe should be flush. When the nominal diameter is greater than, the back sealing welding should be carried out in the pipe. During the processing of the coil pipe the surface damage of the plate should be prevented. The cost is high. The hot-rolled thick wall coil pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller, etc. & amp; quot; quality control 2 thick Compared with seamless steel pipe, thick wall rolling pipe has the disadvantages of low cost, rapid delivery, thick wall rolling pipe breaking the fixed specification of seamless steel pipe, etc. professional hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory and other products have a full range of products, which sell well at home and abroad, and the equipment has a long service life! Products are the leader in the electric wire industry. Welcome to call for consultation Inquiry. Quality department 3 editing of welding process and welded pipe type
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.
.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.
When the nominal diameter is larger than the internal seal of the pipe, and when the butt weld is flush with the pipe, it is and coiled pipe. During pipe rolling, the surface of the circuit board shall be protected from damage.
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.
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, large diameter thick wall rolling pipe,20# large diameter thick wall coiled 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
Accurate measurement of steel plate curl length according to the different process requirements of various pipe rolling manufacturers, the steel pipe length measurement system has a variety of length measurements. There are mainly the following: the basic principle of grating ruler length measurement is: two grating rulers with fixed length are set outside both ends of high-frequency welded coil pipe, and the rodless cylinder drives the grating ruler close to both ends of the steel pipe to realize the measurement of the length of the steel pipe due to the interference of light.
Material used for steel plate coil: it is required to be explained by the user.
Quality improvement.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, 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, columns, etc.
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, 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, which improves the machining accuracy. Save materials
After pushing, the elbows should be formed in this hot state, because some elbows will be distorted after improper handling, which is not allowed. In addition, after pushing the head, the outer diameter of the front end is usually large and formed by the forming die. The forming die is actually a press. It must have a set of molds two semi arcs, one on each side. The outer diameter after forming reaches the size of the finished product.
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
Quality improvement.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, material, 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 principle of encoder length measurement is to install an encoder at the oil cylinder, the oil cylinder pushes the welded steel pipe to move on the roller table, and a series of photoelectric switches with equal distance are installed on the other side. When the steel pipe is pushed by the oil cylinder and the pipe end touches the photoelectric switch, the distance of the oil cylinder can be converted from the recorded encoder reading, 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, 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 research institutes and manufacturers have studied NC plasma cutting technology and gradually developed and produced various specifications of NC plasma cutting equipment,16Mn welded steel pipe, 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, Q345B rolling pipe and special-shaped rolling pipe produced by the rolling pipe factory are exported to major engineering buildings at home and abroad.
.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
It is important that the thick wall coiled pipe will not damage the performance of raw materials. The disadvantage of hot roll thick wall rolling pipe is that the treatment time is long Very expensive. Thick wall rolling pipe is widely used: cylinder hydraulic, roller, etc.
Generally, the wall thickness of the coiled pipe is 20mm and the outer diameter is 450-3000mm. It is directly welded, formed, rolled, butted, removed and reinforced from the steel plate. The coil pipe has the advantages of short processing time, fast delivery and low cost. The rolling pipe is mainly used for pipes, billboards, etc.