it is type I weld; when the pipe wall thickness is greater than 6mm
Pipe groove processing and joint pair: when the pipe wall thickness is less 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. The longitudinal weld of coiled pipe in the same cylindrical part shall not be greater than, and the spacing between two longitudinal joints shall not be less than 200mm.
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.
.With the increase of arc length, the range is expanded the weld pool is widened, and a wider weld formation will be obtained. If welding is carried out in a horizontal position, only the width of the weld will change without affecting the edge of the weld. Over external welding is carried out on a slope, and the molten weld metal will flow laterally under the action of gravity. It can be seen that the greater the welding voltage and the wider the weld pool, the more serious the weld metal will develop, * and eventually lead to the bias current of weld metal.
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, from the pipe gallery to the equipment. In principle, 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, construction 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.
.When the pipe is rolled, the distance between the two welds shall be greater than 100mm, and the distance between the outer wall of the outer branch pipe shall not be less than 50mm.
In addition, when the pipe rolling equipment is made, we should not have more than two longitudinal welds on the same cylinder section of the pipe rolling. For long-term pipe rolling, Q235B pipe rolling, Q345B pipe rolling, large-diameter thin-wall pipe rolling, large-diameter thick wall pipe rolling, stainless steel pipe rolling, L360 pipe rolling and 16Mn pipe rolling, the products are complete, the quality is excellent and the price is favorable. The distance between the two longitudinal welds should not be less than 200.
In general, the process of expanding the diameter of coiled pipe products can be divided into three stages. It is the preliminary rounding stage: the sector blocks are opened until all the sector blocks reach the steel pipe. At this time, the radius of each point in the steel pipe is almost the same within the step range, which is the inner circumference position of the finished pipe with quality requirements.
Round welded pipe joints shall be circular. The arc length of the coil calibration circle shall be 1 / 6 to 1 / of the circumference of the pipe, and the gap between the sample and the pipe shall comply with
Qualitative properties, for example, the strength of steel is greater than that of its main constituent element iron. Professional hot rolled steel pipe, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory, safety, environmental protection and economy! The products are exported to foreign countries and are deeply trusted. The physical properties of the alloy, reactivity and Young's modulus, may be similar to the constituent elements of the alloy. High quality thick wall steel plate coil, but the tensile strength and shear strength of the alloy are usually very different from the properties of the constituent elements and the atomic arrangement in the simple substance.
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.
query.The effect of antirust oil on thick wall coiled pipe is antirust effect which can make the thick wall coiled pipe as smooth as new for a long time and reduce the external corrosion to it. It can also increase its sealing performance and ensure that there will be no problems when transporting fluid. In addition, it has moisture-proof performance, uses antirust oil to isolate the direct air of thick wall welded pipe, so it has little chance of being changed by the external situation, which increases its stable performance and safer use.
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, columns, etc.
Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate. Thick wall coil and large diameter coil are mainly made of carbon steel, Q19 q23 q34 16Mn, etc. coil is a kind of welded pipe product with simple and flexible process. If the length required by the customer is special, 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, so as to expand the steel pipe outward along the radial direction. Mechanical mode is simpler and more efficient than hydraulic mode, so it is more common in practical application. In particular, it is adopted in the very advanced expanding process of several large-diameter straight seam rolling pipelines.
It is not only greatly convenient for storage, transportation, stacking and construction. It also greatly reduces the number of joints: 166 joints of LKM straight pipe, while PVC & mdash; C there are only 10 spiral pipe fittings. It can not only save the cost of and joint, but also greatly improve the safety and reliability of buried power pipes. Moreover, the unit weight of the pipe is light and the construction is convenient, so the comprehensive cost is not high. Spiral tube technology has been widely used in many chemical fields such as heat transfer, mixing and so on. However, the application of spiral tube technology in mass transfer and separation is still relatively few. Spiral pipe manufacturers have applied spiral pipe technology to hollow fiber membrane mass transfer and separation processes such as microfiltration, nanofiltration, infiltration and membrane distillation, which is combined with the axial mainstream into a spiral forward movement, which is beneficial to the laminar mass transfer of fluid, It does not only rely on the radial diffusion of fluid. Sometimes thick wall coiled pipe has two welds. Why does this happen? It is mainly due to the problems of raw materials and equipment processing. The width of the welded pipe required by the customer is 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, and the longitudinal weld on the same cylinder section of coiled pipe should not be more than two. The group of butt welds of coiled pipe shall be flush. When the nominal diameter is greater than, back sealing welding shall be carried out in the pipe. During pipe rolling processing, the surface damage of the plate shall be prevented. High cost. Hot rolled thick wall coiled pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller, etc& amp; amp; quot; Compared with seamless steel pipe, thick wall coil has the disadvantages of low cost, rapid delivery, breaking the fixed specification of seamless steel pipe, etc. Quality department 3 editing of welding process and welded pipe type thick wall coiled pipe is made of steel plate or steel strip after bending and then 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, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin-wall pipe, electric welding special-shaped pipe and spiral welded pipe. Objective knowledge packaging strategy thick wall steel plate coil - thick wall steel plate coil price thick wall coil is formed by bending steel plate or steel strip, with the electrical model of 031 inspection 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, automobile 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, etc. There is also the function of radial secondary flow Quality. Preferential activities are in progress. Welcome to consult. Large diameter welded pipe, which is equivalent to the boundary layer. You can choose tens of millions of products. Professional hot-rolled steel pipe, large-diameter thick wall coiled pipe, thick wall straight seam coiled pipe, steel casing and pipe rolling factory are safe and guaranteed. The mass transfer surface is updated. The mixing of fluid in laminar flow is enhanced and the mass transfer effect is improved. The spiral pipe will also improve the pipe type, That is, due to the close cross flow, 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.
.steel products.
What is the manganese content of straight seam coiled pipe? The material of straight seam coiled pipe and an appropriate amount of manganese 1 can significantly improve the cold brittleness of straight seam steel pipe steel, increase the yield strength and tensile strength, reduce the plasticity and impact toughness, and do not be too large; 4 manganese has an effect on the removal of harmful element oxygen in steel; 5MN can also be used to synthesize high melting point (about 1600 ℃, much higher than the general processing temperature of steel), which is at high temperature in steel, so it can reduce the harmful effect of sulfur and lead to hot processing of steel. Sulfur cracked & ldquo; Hot crisp & rdquo; The phenomenon has decreased.
In short, the use standard of coiled steel pipe is very important, and the above points can be reasonably explained. For the information of our rolled steel pipe, let's simply say so much today. If you need it, you can directly consult our manufacturer.