20# reelHow to
20# reelWhat aFor 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 pipe volume is huge, the production site environment is complex, and the measurement cannot pass through the lower support bench of the steel pipe. This operation is convenient and the measurement accuracy is within & plusmn; Within 10mm, the elbows should be formed in this hot state, because some elbows will be distorted after improper handling, which is not allowed. In addition, after pushing the head, the outer diameter of the front end is usually large and formed by the forming die. The forming die is actually a press. It must have a set of molds two semi arcs, one on each side. The outer diameter after forming reaches the size of the finished product.
.Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and hot rolled thick wall coiled pipe.
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, metric welded pipe, rolling pipe, automobile pipe, transformer pipe, welded thin-wall pipe welded pipe and spiral welded pipe. Coil pipe is dedicated to the production of, 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# longitudinal ring coil pipe and steel pressure pipe, 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.
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, so steel retaining wall is used to protect the hole pile to prevent hole collapse and affect the construction progress and safety. High price hot rolled steel pipe of various specifications, 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, isolate the surface water, guide the drill bit, fix the pile position, protect the original ground, 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, gas supply and other projects.
Recently, with the rapid development of excellent strip continuous rolling production and the progress of welding and inspection technology the weld quality has been continuously improved, and the technology of welded pipe has also been continuously improved, and the application field is relatively wide,Q345B large diameter thick wall coiled pipe, so as to gradually replace the seamless steel pipe. The main one is the technological development of welded pipe. Our welded pipe is made of steel plate or strip steel and welded after crimping. It is generally a welding process, which improves the production efficiency and service quality of welded pipe.
Whether the hot coil thick wall pipe rolling machine operates normally, and fill oil into the oil hole.
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, and the steel pipe is preliminarily rounded. The second stage is the nominal inner diameter stage: the sector starts to reduce the movement speed from the front position until it reaches the required position, which is the inner circumference position of the finished pipe with quality requirements.
The cheapest.In general, the hot coil pipe is mainly committed to the production of all kinds of circumferential seam and longitudinal ring coils and steel penstocks. It is reformed on the basis of traditional coil equipment and similar specifications and models, so that all parameters of the hot coil pipe can be improved, in terms of processing technology, the hot coil pipe needs attention. The following matters are required: before processing, the hot coil pipe needs to be familiar with the technical requirements of paper, process material properties and other related aspects, select an appropriate hot coil machine determine whether the cold coil, warm coil or hot coil, and then operate.
The process of thick wall straight seam coiled pipe is generally rolled. If the diameter required by the customer is particularly large, it is difficult for general machinery and equipment, so it is necessary to use coiled pipe. First after the steel plate is rolled, then weld the two rolled steel pipes. The weld is also called T-welding. Sometimes, the large diameter thick wall straight seam steel needs to roll and weld the two steel plates,Q235B welded steel pipe, Therefore, there may be two welds on a pipe body, also known as double welds. Thick wall straight seam coiled pipe has a wide range of materials. As long as it is a steel plate that can be ordered in a steel plant, it is basically OK. The main problem of the product is the welding quality. The welding quality directly determines the quality of the product, which is the main step in the thick wall rolling pipe. It is suitable for columns for bearing steel structures such as buildings, bridges, dams and offshore platforms, super long-span building structures and electric pole tower and mast structures requiring wind resistance and earthquake resistance.
The effect of antirust oil on thick wall coiled pipe is antirust effect, 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.
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, resulting in the increase of weld reinforcement, the deterioration of weld formation and poor edge transition.
Quality recommendation.The rolling pipe production technology requires that 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.
Generally, the wall thickness of the coil is 20mm and the outer diameter is 450-3000mm. It is directly rolled and welded from the steel plate. It has the advantages of short processing time, fast delivery and low cost. Coil is mainly used for pipes, billboards, etc.
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
.The thickness of hot-rolled thick wall coil is generally greater than 20mm, and the outer diameter range is 450-3000mm. The hot-rolled thick wall coil is rolled, welded, formed ribbed and defect detection under the condition of steel plate heating. Sometimes the wall thickness is relatively thick and secondary heating is required. It is characterized by small outer diameter tolerance and uniform wall thickness. It is important that the hot rolled thick wall coil will not damage the properties of raw materials. The disadvantage of hot roll thick wall rolling pipe is that the treatment time is long. Hot rolled thick wall coiled pipe is widely used: cylinder, hydraulic, bridge, roller, etc.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
1800mm steel pipe elbow detailed introduction to elbow: first of all, the material is hot pushed, the pusher is a horn shaped core or mandrel, the mandrel is thickened and thickened, the process of pushing the elbow is the process of expanding the diameter, and it is supported on the back. The material tube part passes through the mandrel, and there is an arched frame at the rear to fix the mandrel. There's a car in the middle. Some cars are driven hydraulically, others are driven by mechanical transmission, that is, screw drive, and then the car pushes forward, and the car pushes the pipeline along the core. The rod moves forward, there is an induction coil outside the mandrel, the tube is heated and heated, and then the trolley pushes the tube down and processes one.