Futian District sided spiral submerged arc welding manufacturer

Futian District sided spiral submerged arc six manufacturers Liu Bao Tel: 18033242424 18823102210 spiral welded pipe: a low-carbon carbon structural steel or low alloy steel strip by a certain helix angle (called molding angle) rolled into a tube , then seam welded tube is made, it can be produced with a narrow strip of large diameter steel pipe. Its specifications diameter * thickness of said pipe should ensure hydrostatic testing, tensile strength and cold bending properties of the weld to be in compliance. Mainly used for steel pipe pile steel piling pipe coil steel casing pipe casing retaining barrel spiral welded steel pipes of large diameter steel water pipe sewage drainage pipe straight seam steel spiral welded steel pipe straight seam welded steel pipe corrosion spiral coil galvanized spiral The thickness of 6-40mm diameter 219-5000mm billboard column low carbon spiral pipe submerged two-sided spiral high-frequency welding spiral hydropower penstock pipe fluid pipes dredging bridge jacking thick spiral coil Q345B Q235B spiral small caliber antiaircraft spiral spiral spiral pipe piling GB large diameter spiral spiral spiral steel coil tube T 3PE steel welded pipe spiral steel pipe welded steel pipe pile drilling reel irrigation (guan) Note pile steel casing pile steel water Casing drilling steel casing pile pile pile of steel casing steel casing bridge piling steel casing city pier piling steel casing pile steel casing bored piles and bridge pillar steel casing pipe steel bridge bored pile retaining Bored barrel offshore pier piling steel casing pipe steel pipe pile foundation grouting steel piling pipe pile bridge piling supporting spiral welded pipe Chinese name English name spiral welded pipe is mainly used for oil and gas pipelines category sided welding and the Ministry of National Standard GB double-sided welding / T9711-2011 industry standard SY / T5037-2000 US APISPEC 5L welded steel pipe standards within the industry TV inspection equipment: In test weld appearance. Magnetic detectors: test near surface defects in large-diameter pipe. Continuous automatic ultrasonic flaw detector: horizontal and vertical defect inspection spiral pipe full length of the weld. Manual ultrasonic flaw detector: re-examination, the quality of the large-diameter pipe weld defects in the weld after welding inspection and pressure. Automatic detection of X-ray machines and industrial television imaging equipment: full-length internal quality spiral pipe weld inspection, the sensitivity of not less than 4%. X-ray film equipment: the original seam weld and welding inspection, the sensitivity of not less than 2%. 2200 ton hydraulic press and computer automated recording system: Pressure test the quality of each large-diameter steel pipe. 2 testing of raw materials inspection process - school level test - butt welding inspection - forming test - welding inspection - outside welding inspection - cut pipe inspection - Ultrasonic testing - bevel inspection - Dimensions testing - X-ray inspection - hydraulic test - the final inspection to ensure product quality, we have developed a comprehensive quality program, field work and testing procedures, test plans. Corrosion corrosion requirements of the project compared with other domestic programs are quite different, the main difference is: · anti-corrosion materials commonly used domestic cement mortar, this project uses non-toxic epoxy coating (thickness 0.4mm). · External Coatings general domestic spark test voltage of 3000 volts, the maximum not more than 5000 volts, the project is 10 kV. Corrosion spiral welded spiral pipe corrosion for the above requirements, we concentrate on the job in the following two aspects: · strict procedures to ensure a sand blasting quality and finish inside and outside primer spray within one hour, which is to ensure the quality of corrosion fundamental. · In developing corrosion process requires our special glass cloth impregnated with coal tar epoxy primer first, semi-mechanical roll wrapping, and glass cloth by hand with a roller bulldozed approach operations to ensure uniform outer coating of fine. · External corrosion of pipes, open yard in four months testing, internal coating no yellow pitting and other undesirable phenomena, outer coating is still up to 10 kV spark test requirements. Compare the following technique, I spiral welded pipe and Longitudinal technical characteristics make a simple comparison: Metallurgical and Materials Performance LSAW steel pipe is produced, and spiral welded pipe is produced by hot-rolled coil. Hot strip rolling process unit has a number of advantages, have access to production capacity of high quality pipeline of metallurgical processes. For example, the output carriage equipped with a water cooling system to accelerate cooling, which allows the use of low alloy composition to achieve the specific intensity level and low temperature toughness to improve the weldability of the steel. However, this system is basically no steel production plant. Alloy content Coil (carbon equivalent) is often less than similar steel grades, it also increases the spiral welded weldability. More should be noted that, since the spiral welded steel pipe coil rolling direction is not perpendicular to the axial direction (depending on the steel pipe which is interposed Solutions helix angle), and the straight pipe joints of steel sheet rolling direction is perpendicular to the steel pipe axial direction, and therefore, the coil crack resistance of the material is better than straight seam welded steel pipe. · Welding process from the welding process, the identical spiral welded steel pipe and straight seam welding method, but inevitably there will be a lot of Longitudinal welds T, so the probability of the existence of welding defects has greatly improved, and T-weld The welding residual stress is large, the weld metal is often in a three-dimensional stress state, increasing the likelihood of cracks. Moreover, according to the provisions of submerged arc welding process, each weld and shall have the arc extinction at the place, but each ring in the welding seam welded pipe, unable to meet the conditions, which may have a place in the extinction more weld defects. ? When the strength characteristics of the pressure in the pipe to withstand, usually produces two main stress is on the wall, that the radial and axial stress stress δY δX. Weld resultant stress δ = δY (l / 4sin2α + cos2α) 1/2, where, α helix spiral weld pipe angle. Helix angle of spiral weld pipe is generally 50-75 degrees, so the spiral weld resultant stress is 60-85% Longitudinal principal stress. Under the same operating pressure, spiral welded pipe of the same diameter welded pipe wall thickness ratio can be reduced. According to the above characteristics seen:? A blast occurred when the spiral welded pipe, the weld suffered stress and the resultant stress are relatively small, blasting the mouth is generally not originated in the spiral weld, its security is higher than the Longitudinal. B. When there are parallel with the nearby spiral weld defects, due to the smaller spiral weld force, so it is better to extend the risk of a large straight seam. C. under maximum load when the radial stress is due to the presence of maximum stress on the pipe, so the weld in the vertical stress in this direction. That is the biggest load of straight seam bear ring to weld the loads smallest spiral seam between. · Hydrostatic burst strength by the relevant comparison test, to verify the yield pressure and burst pressure measured and theoretical values ??spiral welded pipe and Longitudinal basically consistent deviations close. But whether it is the yield stress or burst pressure, were lower than the Longitudinal spiral welded pipe. Burst test also shows the rate of deformation ring spiral welded pipe blast was significantly greater than Longitudinal mouth. It was thus confirmed, spiral welded plastic deformation capacity than Longitudinal, blasting the mouth is generally confined to a pitch, which is the spiral weld on the expansion gap from a strong role in binding due. · Toughness and fatigue strength of the trend is the development of large-diameter pipes, high strength. With the increase of the diameter of the pipe, the steel grade increase, resulting in the greater fracture toughness tip steady expansion trend. According to the test showed that the US research institutions, spiral welded pipe and Longitudinal although the same as a level, but the spiral welded pipe has a high impact toughness. Pipelines due to changes in the amount lost in the actual operation, the pipe is to withstand random alternating load effect. Understand the low cycle fatigue strength of steel, to determine the life of the pipeline is of great significance. According to the measurement results, the fatigue strength of the spiral welded pipe and seamless and ERW pipe the same test data and seamless pipe distribution and resistance in the same area, and submerged arc welded pipe than the average higher. · Field weldability spot weldability mainly by the steel material and port with the dimensional tolerances decision. Taking into account the requirements of the installation and construction steel, steel processing and production of continuity and consistency of shape geometry is particularly important. Spiral welded pipe production is basically stable continuous flow in the same working conditions: The Longitudinal production process is segmented, including the entire board / ram / pre-roll / spot welding / soldering / finishing / peer group the process of multi-channel processes. This is an important feature of spiral welded pipe production is different from Longitudinal production. Stable production conditions is very easy to control and geometry of welding quality assurance. Because regular spiral welded tube, weld evenly distributed, with respect to the welded pipe, spiral pipe nozzle has a very good degree and end vertical oval, welded steel pipes to ensure the scene when the group set for accuracy. · Impact on the flow characteristics of the transmission medium length delivery pipeline pressure drop and tube, fluid viscosity of a fluid velocity, the fluid drag coefficient is proportional to the inverse proportion and the pipe inside diameter. And both fluid drag coefficient and Reynolds number, but also with the tube wall roughness of the surface. It was determined that the impact of the tube inner wall surface roughness plays than the local uplift of the area (such as spiral or longitudinal seam welds, even within the circumferential weld) played ten times the impact. · Production Management spiral welded steel pipe production and to reflect the high quality and efficiency advantages. A spiral welded pipe production unit is equivalent to 5-8 units Longitudinal equipment, how to make more than one volume control equipment, production lines are able to achieve the same production standards, ie unified production process specifications and quality assurance system of production in order to meet the quality of welding requirements and pipe manufacturing grade will be an arduous task. Long production potential than increasing the amount of engineering project management and quality supervision. Multiple volumes of straight seam welding machine and the corresponding equipment, operational skills of its operating personnel, quality consciousness, the difference distribution points and control program will bring production management, schedule, inspection and acceptance, many difficulties in coordinating other aspects of delivery easily result in quality hectic and manufacturers and construction management and coordination unit on prevarication. · Quality assurance in accordance with the provisions of spiral welded pipe production standards, spiral welded steel pipe for the main test / control projects include: Dimensions: pipe diameter, wall thickness, ovality, bending, tube end squareness, the length of the appearance of quality: Weld I high, the wrong side of the pipe surface, delamination, inclusions, weld defects determine the chemical composition of the welded joint tensile test hydrostatic test etch inspection and non-destructive testing Longitudinal no corresponding production standards. General spiral welded pipe mill line continuous test methods are used to ensure the quality of welding seam, which is another important feature of spiral welded pipe production is different from Longitudinal production. Continuous monitoring test is conducive to welding defects, stable welding quality, welding grade guarantee. Due to limitations of the production process, Longitudinal extremely difficult to achieve uninterrupted inspection. This will increase the probability of occurrence of welding hidden quality problems, and even affect the overall reliability of the pipeline for future runs. · Production Qualification spiral welded pipe manufacturer should hold the national industrial production permit issued. Licensing requirements spiral welded pipe producers should first review the assessment by the national institutes of recognized authority, with the appropriate means of production, testing equipment, effective quality assurance system works well, the product should meet the national standard level and quality specification requirements , after the national industrial production permit issuing office confirmed. So spiral welded pipe producers have better quality assurance system operating procedures and quality control. Longitudinal manufacturers no industrial production permit requirements. · Material price analysis techniques due to the high performance of hot-rolled coil and production technology requirements, so the one hand, domestic manufacturers meet the standards to be less than the steel manufacturers, on the other hand its production process and quality level to determine its market price is also higher than the hot-rolled steel. This is the main reason for the spiral welded pipe market price is higher than the Longitudinal. For the composition of the steel pipe sales price, the price of materials is the dominant or even the decisive factor. Carefully examine the price difference spiral welded pipe and Longitudinal, priced slightly higher than the Longitudinal spiral welded pipe due to price differences due to the production of primary materials. However, steel production is only the part of the project, if taking into account the overall quality of the project, the project total cost and other factors, spiral welded pipe still has the overall advantage. Length Length Length Length pipe production and prices decreased greatly over the yield usual length of the tube, the production company proposed fare increase is a reasonable request. Companies are not the same rate of increase, the general basis for the base price increase of about 10%. Length Length should be within the usual length, size is a fixed length contract requirements. But the actual operation is the absolute cut-length cut is unlikely, and therefore the standard of length specifies the length of the positive deviation allowed. If the standard deviation is no double length and cutting margin requirements by both parties and specified in the contract negotiations. Times longer scale length with the same length, producers will bring a significant reduction in the yield, so the producers proposed fare increase is reasonable, its rate of increase with the length of the rate of increase is basically the same length. Plasma Cutting soot and other ions in the process of cutting a workpiece will generate a lot of metal vapor, ozone, nitrogen oxides soot, will seriously pollute the surrounding environment. The key to solving the problem is how to smoke a plasma smoke inhalation to dust all the equipment, thus preventing air pollution. As for the spiral welded pipe plasma cutting, dust difficulty is: a plasma gun nozzle simultaneously to both air blowing in the opposite direction when cutting, so that the smoke coming out from both ends of the spiral steel pipe, installed in one direction, the spiral steel pipe The intake port is very difficult to recycle the fine dust. 2, the inlet from the periphery of cold air into the suction machine and the amount of wind outside the gap is large, so that the total internal spiral pipe smoke and cold air is greater than the effective amount of dust inhaled air, thus cutting soot absorption becomes completely impossible. 3, due to the cutting region far from the dust suction port, is difficult to reach the suction inlet of the wind tic soot. For this reason, dust cover design principles are: 1, dust inhaled air volume is greater than the total amount of plasma cutting and pipe smoke generated inside the air should be in a spiral inside the pipe to form a certain amount of negative pressure chamber, and try do not let outside air poured into the spiral steel pipe, the smoke can be effectively sucked into the filter. 2, in the spiral pipe cutting point position after smoke blocked the entrance to avoid the cold air sucked into the internal spiral steel pipe, spiral steel pipe in the interior space will form a negative spiral of smoke baffles mounted inside the pipe accompanied by a small car and home in plasma gun at the cutting point about 500mm, after staying at the cutting spiral pipe, reaching all the soot absorption. Note smoke baffle must accurately positioned at the position after cutting. In addition to the support car and accompanying smoke baffle rotating spiral steel mutual agreement, you must let the car go round accompanying angle inside the roll angle consistent. For large diameter spiral welded pipe diameter of about 800mm plasma cutting, you can use this method; for a diameter less than 800mm, small diameter pipe smoke does not emerge from the direction, without having to install an internal baffles. But in the former entrance to suck smoke, there must be an external blocking cold air into the bezel. 3 development direction of the pipeline due to the increasing bearing pressure, using increasingly harsh conditions, and to try to extend the life of the pipeline, so the main direction of development of spiral welded pipe are: (1) the production of large diameter thick-walled tubes to increase pressure capacity; ( 2) the design and production of new steel structure, such as a double spiral welded pipe, which uses half the thickness of the wall strip welded into a double tube, not only the intensity is higher than the same thickness of single tube, and will not appear brittle failure; ( 3) development of new kinds of steel, smelting technology to improve the level of widespread adoption of controlled rolling and heat treatment process after rolling to continuously improve toughness and weldability of the tubular body; (4) to develop coated pipes, such as the inner wall of the tube coated with a coating, not only to extend the life and improve the smoothness of the inner wall can reduce fluid friction, reducing the volume of wax and dirt, reducing the number of pigging, reduce maintenance costs. Spiral welded pipe played a significant role in conveying gas, transportation. With the planning and construction of a number of major domestic and international pipeline projects, large deformation steel, high-strength levels and heavy-gauge hot low simmer elbow fittings high value-added products, showing a good market competitiveness and greater market demand while domestic enterprises in the development of the series products is relatively slow progress, should be developed for industrial applications of high-value large deformation pipeline as soon as possible, the heat and simmer bend steel, pipeline stations with low-temperature steel pipe fittings, X100 straight seam submerged arc welded pipe, spiral submerged arc welded pipes and spiral welded pipe heat simmer bend. 4 Perform standard pressurized fluid transport spiral submerged arc welded pipe SY5036-83 mainly used to transport oil, natural gas pipelines; pressure fluid transmission SY5038-83 seam high frequency welded steel pipe with a screw, lap welding method using high-frequency welding for spiral seam high frequency welded steel pipe pressure fluid delivery. Strong pressure steel, plastic, and easy welding and machining molding; general low pressure liquid delivery spiral submerged arc welded pipe SY5037-83, using double-sided automatic submerged arc welding or welding into the legal system for water, gas, air and steam low pressure liquid delivery SAW pipe. Commonly used spiral steel pipe standards are generally divided into: SY / T5037-2000 (Ministry of standard, also known as general fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-1997 (GB, also known as the oil and gas industries - Steel pipe Technical delivery conditions Part: A grade steel (demanding a GB / T9711.2 B grade steel)), API-5L (American Petroleum Institute, also known as line pipe; which is divided into two levels PSL1 and PSL2), SY / T5040-92 (pile with spiral submerged arc welded pipe). 5 production equipment uncoilers: double cone head uncoiler, removable 32 tons heavy steel coils. Flat steel cutter machine: flat for seven roller cutter, thickness of up to 20mm shears: You can cut 2000mm * 20mm Coil Welder: just lead solder tail disc cut: cut steel burrs to achieve the specified size Milling Machine : The ≥10mm steel processed into the required bevel edger device: to ensure delivery of steel wire running along the delivery machine: two roll forming machine for the delivery of the main power guides: to ensure a balanced plate into the molding machine molding machine and the bridge, the output rollers Road, three stick bending, outside the roll sizing molding machine can be molded Φ219-Φ2520mm internal and external pipe welding equipment: welding monofilament inside and outside double wire welding, the choice of Lincoln welder, and the infrared thermal imaging solder flux tracking control system Recovery: The recovery of welding flux automatic welding equipment outside: to repair defects in welds flat edge machine: to ensure that the requirements to meet the standards of the pipe end hydrostatic testing machine: 100% of the hydrostatic test load measuring device: Weighing and measuring pipe The length of the spiral steel pipe, spiral pipe, steel plants, bridges top tube, steel casing, steel coil pipe piling pipe, steel pipe piles, water pipes, billboards column tube, water, piling steel casing pile casing, Guangzhou, Shenzhen, Guangdong Chaozhou Foshan, Jiangmen, Zhanjiang, Maoming, Yangjiang, Zhaoqing, Huizhou, Meizhou, Shanwei, Heyuan, Qingyuan, Dongguan, Zhongshan, Zhuhai, Shantou, Jieyang, Yunfu, Shaoguan Nanning, Beihai, Qinzhou Fangchenggang Guigang Yulin Chongzuo guest Baise, Hechi Hezhou Liuzhou, Guilin, Haikou, Sanya, Hainan Wuzhou Ji'an, Jiangxi Ganzhou, Fuzhou, Shangrao, Yichun spiral galvanized spiral, Spiral Pipe factory, the price spiral, spiral pipe manufacturers, large diameter steel pipe. 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