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 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.
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.
.8-100mm steel pipe.
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.
.Rolled pipe is divided into straight seam rolled pipe and T-shaped welded pipe. The pipe rolling can meet the market demand for less number and more models of welded pipes. It can be used for pipe pile, conveying fluid, pressure vessel, etc. The longitudinal weld of the same barrel section of high pressure and high temperature continuous pipe shall not exceed two courses and the spacing between the two longitudinal welds shall not be less than 200mm.
Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
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.
The influence of welding process parameters mainly includes two aspects: according to the production characteristics of spiral steel pipe, the welding current is usually smaller for internal welding and larger for external welding. However, under the condition of large welding current, the stirring effect of molten pool is intensified, and the melting amount of welding wire is also the same
Because of its good mechanical properties, it has been widely used in steel pipe production. According to the different process requirements of steel rolling manufacturers, the steel pipe length measurement system has a variety of length measurement methods. The main points are as follows: the basic principle of grating ruler length measurement is: two fixed length grating rulers are set outside both ends of high-frequency welded continuous pipe, and the rodless oil cylinder drives the grating ruler close to both ends of the steel pipe to realize the interference measurement of the length of the steel pipe.
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.
Inspection items.For external welding, a larger welding current is used. However, under the condition of high welding current, the stirring effect of molten pool is enhanced, and the melting amount of welding wire increases accordingly, resulting in the increase of weld reinforcement, the deterioration of weld formation and poor edge transition.
The influence of welding process parameters on welding current mainly includes two aspects: according to the production characteristics of spiral steel pipe, small welding current is usually used for internal welding
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, 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.
Since the groove sizes of longitudinal and circumferential joints of hot-rolled pipes are different, it is necessary to confirm whether the inner side is upward before plate rolling to ensure the correctness of groove direction.
How much does it cost?.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 wall thickness of two cylinders should not exceed two. 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 L360 rolling and 16Mn rolling were analyzed. The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate.
A series of water conservancy projects such as sand discharge, mud transportation, dredging and hydraulic reclamation. It is generally believed in the dredging industry that spiral pipe is the Zui best pipe for long-distance water conveyance and solid-liquid mixed transportation projects. The sand and mud discharge pipeline products produced by Hebei Xinghao pipeline industry have been used by hundreds of customers in China. Flange welded spiral steel pipe is widely used in long-distance water supply and drainage in various environments and exported to Japan. The connection is completed by adding flange gasket and fastening it with bolts. Some pipe fittings and equipment have their own flanges, which also belong to flange connection.
Meet the following requirements: 1. The longitudinal joint of butt joint shall not be greater than 10% of the wall thickness plus 2mm, and shall not be greater than 3mm. 2. The longitudinal joint of joint 200mm away from the pipe end shall not be greater than 2mm. 3. Other parts shall not be greater than 1mm. 4. The vertical deviation between the end face of coiled pipe and the center line shall not be greater than percent of the outer diameter of pipe and shall not be greater than 3mm. The straightness deviation shall not exceed 1mm / m. 5 the weld cannot be double-sided molded coiled pipe. When the nominal diameter is greater than or equal to 600mm, it is recommended to seal and seal in the pipe. In order to obtain better uniform cleanliness and roughness distribution, the particle size and proportion design of rinse agent is very important. The roughness is too large, because the cloud path is too deep, which seriously affects the performance of the layer.
.First, select the specification and put forward the pipe, such as 90 & deg; Elbow, which can calculate the curvature to calculate the 90 DEG of the long material; Elbow, and then cut with the length as the fixed length.
The rolling pipe factory mainly produces steel plate rolling pipe and thick wall rolling pipe. With the development of domestic economic situation and the acceleration of welding and casting trend, the advantage of NC cutting is 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 CNC cutting machines used in the thick wall rolling pipe 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 CNC cutting machines are CNC 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, mainly in
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.