The main purpose of preheating is to reduce the cooling rate of welded joints and preheat temperature. As can be seen from the table, preheating can reduce the cooling rate, but basically does not affect the time spent at high temperature, which is ideal. Therefore, when welding thick wall coils with hardening trend, the main technical measure to reduce the cooling rate and hardening trend is preheating rather than increasing the line energy. Plasma cutting of thick wall coiled pipe is more effective than gas cutting
The products are widely used in petroleum, chemical industry, natural gas transportation, pile driving and urban water supply, heating, gas supply and other projects. The wall thickness of the hot-rolled thick wall coil of retailers generally exceeds 20mm, and the outer diameter range is 450-3000mm. The hot-rolled thick wall coil is rolled, welded, formed, de reinforced, flaw detected and delivered under the state of steel plate heating. Sometimes the wall with special thickness needs secondary heating. It is characterized by small outer diameter tolerance and uniform wall thickness. The main thing is that the hot-rolled thick wall quality management coil will not damage the performance of raw materials. The disadvantages of hot-rolled thick wall coil are long processing time and the diameter of thick wall coil is generally above dn450.
.The welding method of welded steel pipe is submerged arc welding; Molding process, forward swing intermittent production; Unit speed 0.5 -- 3m / min; Welding speed, 0.5 -- 3m / min. The unit is composed of uncoiler, straightener, centering device, hydraulic shear, milling welding machine, disc shear, edge milling machine, plate surface cleaning equipment, delivery machine, internal welding forming machine, external welding, flash, pulling out, slag pouring, repair welding, flat head chamfering, hydraulic inspection, finished product inspection and degreasing collection. The whole process of submerged arc welding of spiral steel pipe is as follows: the principle of spiral steel pipe submerged arc welding: submerged arc welding is welded with arc heat energy. The difference from manual electrode arc welding is that the welding wire of submerged arc welding is, and there is no coating on it. The flux of submerged arc welding is pre laid at the place to be welded. In the flux of submerged arc welding wire, the arc is under the flux. For welding wire and workpiece, when the start button is pressed, the welding wire and workpiece are energized, the arc is ignited, the welding trolley moves forward, and the welding wire is continuously transported downward to maintain the arc under the flux layer and form a welding pool under the arc. Around the arc, the flux melts to form a cavity. The cavity and molten pool advance continuously, and the metal behind the molten pool solidifies to form a continuous weld. This process is carried out under flux, so we can't see it. It can be seen by means of X-ray photography. Because the spiral steel pipe adopts the welding technology of submerged arc automatic welding, in addition to this, the production efficiency is high; The auxiliary time of production is less, which saves the time of electrode replacement; The welding conditions are clean, saving the cleaning time; High weld quality. It also provides necessary conditions for the delivery of spiral steel pipe factory, so that the production time of large amount of spiral steel pipe can be guaranteed, so it is still widely used.
Circumferential deviation of coiled pipe, pipe groove processing and joint pair: when the pipe wall thickness is less than 6mm, it is type I weld; when the pipe wall thickness is greater 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. Long term supply of hot rolled steel pipe, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, rolling pipe factory has complete products and excellent quality, The price is favorable. The longitudinal weld of the winding pipe with the same cylindrical part shall not be greater than the spacing between two longitudinal joints shall not be less than 200mm. The arc length of the winding pipe calibration template shall be 1 / 6 ~ I of the circumference of the pipe / the gap between the template and the pipe. Let me introduce the steel plate production standard winding pipe. During the winding process, the surface of the circuit board shall be protected from damage. Parts with severe scars shall be ground to achieve transition, and the wall thickness of the ground part shall not be less than the design wall thickness.
.Flame cutting and plasma cutting are commonly used for sheet metal blanking in our factory. The equipment used includes manual cutting, copier, semi-automatic cutting machine and NC cutting machine. Manual blanking is arbitrarily large compared to other cuts Flexible and convenient, no special supporting cutting equipment is required.
Steel casing means that in the process of manual hole digging pile, due to the unstable soil, it is difficult to construct reinforced concrete retaining wall, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory has timely supply and high cost performance. It has become the preferred brand for many wire products. Welcome to buy! The steel pile casing is a circular barrel hooped with iron sheet according to the size of the hole pile, and both ends are empty barrels. It can stabilize the hole wall, prevent hole collapse, fix the pile position guide the drill bit, protect the original ground, etc., which is generally 20-40cm larger than the pile diameter. The buried depth depends on the properties of the soil. The deviation of the plane position shall not be greater than 5cm, and the inclination shall be less than 1%. The reel is committed to the production of circumferential joints All kinds of longitudinal coils and steel penstocks are reformed on the basis of similar specifications and models of traditional coil equipment. The function of improving the parameters of the pipe rolling equipment by 30% fills the gap that the original traditional rolling equipment can not produce. It can produce steel pipes with diameter of more than 400 and wall thickness of 8-100mm. The materials mainly include Q235, Q345, 20 #, 45 #, 35cimo and 42cimo 16 manganese and 16 manganese capacity. Generally, cold-rolled plate can be used for rolling pipe, etc. Product executive standard: GB / t50205-200, GB / t3092-2001, etc. Coiled pipes are widely used in petroleum chemical industry, natural gas transportation, pile driving, urban water supply, heat supply, end face deviation, etc.
Executive standard for steel plate rounding: structural tube gb8162-2008 fluid tube gb8163-2008 low and medium pressure boiler tube gb3087-2008 high pressure boiler tube GB5310-2008 special tube for chemical fertilizer GB 79-2000 petroleum cracking tube gb9948-88 steel plate rounding production process: tube blank & mdash& mdash; Inspection & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Grinding & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash;& mdash;& mdash; Pickling and passivation & mdash& mdash; Inspection & mdash& mdash; Cold rolling & mdash& mdash; Degreasing & mdash& mdash; Cutting head & mdash& mdash; Air drying & mdash& mdash; Internal polishing & mdash& mdash; External polishing & mdash& mdash; Inspection & mdash& mdash; Identification & mdash& mdash; Process flow inspection of finished product packaging industrial pipe & mdash& mdash; Peel & mdash& mdash; Inspection & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pickling & mdash& mdash; Mushroom trimming & mdash& mdash;Air drying & mdash& mdash; Welding head & mdash& mdash; Cold drawing & mdash& mdash; Solution treatment & mdash& mdash; Pickling & mdash& mdash; Pickling and passivation & mdash& mdash; Formula of steel plate rolling weight: [(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter)
The inner diameter of 1800mm steel plate coiled pipe elbow is 1800mm, the bending radius is also 1800mm, four bends, the material thickness is 4mm, and the bending is 90 & deg;.
technical service.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, leakage may occur when cold and hot water are used alternately.?
Generally, the packaging process of thick wall coiled pipe mainly includes filling, wrapping, sealing and other processes, as well as related pre and post processes, such as cleaning, stacking and disassembly. Because it is used strictly, the process of thick wall rolling pipe shall be strict, and the production shall be carried out according to the correct methods and principles. In addition, the process of thick wall rolling pipe also includes stamping on the package. The use of mechanical packaging products can improve productivity, reduce labor intensity and meet the needs of large-scale production. Thick wall coiled pipe is developed with the emergence of new packaging materials and the continuous innovation of packaging technology. It can show important value in different industries and fields.
High. Hot rolled thick wall coiled pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller, etc.
1 carbon structural steel: q215-a, q215-a. & middot; F,Q215-B,Q215-B· F,Q235-A,Q235-A· F,Q235-B,Q235-B· F. Q235-c ordinary carbon steel: B2 BY2 B2F by2f B3 by3 B3F by3f a2ay2 a2f ay2f A3 ay3 A3F ay3f2 high quality carbon steel: 10 15 20 transmission shaft steel 3 low alloy structural steel: 123mn 16Mn 19mn 08ti 10ti15ti4 special purpose steel thick wall coil is made of steel plate. Long term coil Q235B coil, large diameter thin wall coil, large diameter thick wall coil, stainless steel coil, L360 coil, 16Mn coil, 20 old brands, with price advantages and quality! Thick wall coil can be divided into two types: hot coil and thick wall coil.
Project scope.The main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally, cold rolled sheet can be used for pipe rolling, and the product standards are GB / t50205-200, GB / t3092-2001, etc. Continuous pipe is widely used in petroleum, chemical industry, natural gas transmission, pile driving, urban water supply, heat supply gas supply and other projects.
997 technical standard for fusion bonded epoxy powder coating of steel pipeline
Extend the length of the part: 566, divide it into 24 equal parts, symmetrical, and the length of each bisector from the middle to the side is: 11 110 106 10 93 84 75 66 57 0, 50 44 40 39 2.
.Weight per meter of steel plate coil = (outer diameter wall thickness) * wall thickness * 0.0246615 steel plate coil is made of steel plate. Thick wall t-welded coil can be divided into coil and hot rolled thick wall coil.
In order to make you better understand the installation method of coiled pipe, 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, leakage may occur when cold and hot water are used alternately.?
The main purpose of preheating is to reduce the cooling rate of welded joints and preheat temperature. As can be seen from the table preheating can reduce the cooling rate, but basically does not affect the time spent at high temperature, which is ideal. Therefore, when welding thick wall coils with hardening trend, the main technical measure to reduce the cooling rate and hardening trend is preheating rather than increasing the line energy. Plasma cutting of thick wall coiled pipe is more effective than gas cutting