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.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
.The principle of encoder length measurement is to install the encoder on the oil cylinder and roll the large-diameter pipe. The oil cylinder pushes the welded steel pipe to move on the roller table, the stroke of the oil cylinder can be converted according to the recorded encoder reading and provided by the large-diameter continuous control manufacturer, so as to calculate the length of the steel pipe.
In order to make you better understand the installation method of coiled pipe, the following coiled pipe factory will introduce the installation method of coiled pipe: pipe hoop is used, and raw silk belt, white hemp wire, pipe expander handle and other tools are used to connect coiled pipe and pipe fittings. This method may need repeated debugging due to the great influence of human factors. In addition, when the materials of coiled pipes and pipe fittings are different, due to their different thermal coefficients, 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 ultrasonic flaw detector, 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, metric welded pipe, 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, and then made by high-frequency welding and submerged arc welding. According to the weld form, 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 welding thin-wall pipe, electric welding special-shaped pipe and spiral welded pipe, coil, Q235B coil, Q345B coil, large-diameter thin-wall coil, large-diameter thick wall coil, L360 coil and 16Mn coil. The inspection is strict and the quality is preferential
Be able to show important value in different industries and fields. When the coiled pipe is greater than 600mm, two longitudinal welds are allowed, and the spacing shall be greater than 200mm.
In fact, the surface pit of the coiled pipe is almost caused by the sparse iron oxide scale on the surface of the steel plate. In general, we can apply the following methods for prevention.
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, 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#, 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.
The utility model overcomes the difficulties of large steel pipe volume, complex production site environment and inability to support the platform under the steel pipe. The measurement accuracy is within & plusmn;; Within 10mm, which is divided into continuous pipe and hot-rolled thick wall pipe.
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.
Where can I find it?.The steel plate coil adopts the secondary forming process. When rolling, first bend both ends of the steel plate and the diameter shall be less than the diameter of the coiled pipe. Then adjust the bed pressure, rolling two to three times steel pipe coiled pipe welding and strengthening the rolling pipe joint, long-term rolling pipe, Q235B coil pipe, Q345B coil pipe, large diameter thin wall tube, large diameter heavy wall coil pipe, stainless steel coil pipe, L360 coil pipe, 16MN coil pipe and other brand products, designated products are complete, quality assurance. Then transported to the welding platform for welding.
The diameter of thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. The reason why this happens is mainly due to the problems of raw materials and equipment processing. 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 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, forming joint and other comprehensive factors.
Finish machining is performed below flux process performance, 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.
Safety and health.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 the cold-rolled seamless steel pipe is shorter than 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 its wall thickness is generally smaller than that of the hot-rolled seamless steel pipe, and there are not too many burrs in the diameter. The thick wall coiled pipe is a powerful manufacturer, quotation, honest operation,. Welding with complete specifications, forming, butt joint and pipe rolling, 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.
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, such as density, 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.
Steel plate materials mainly include Q235, Q345, 20, 45, 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.
.The rolled pipe shall meet the specified arc degree end face deviation, straightness, etc.
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.
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.