Q355b welded pipeAnalysis of industry emerging market representatives

announcer:hp709HP180518493 release time:2022-03-07 20:17:25

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.

Continuous pipe is committed to producing all kinds of circumferential seam, longitudinal circumferential continuous pipe and penstock, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment.

.Grounding current, while external welding uses a larger welding current. However, when the welding current is large, the effect of welding rod is intensified, and the melting amount of welding wire is also increased accordingly, the weld reinforcement is increased, and the edge transition is poor.

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.

.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;.

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, 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.

Before starting up, it is necessary to check whether the hot coil machine operates normally and fill the oil hole with oil.


Q355b welded pipeAnalysis of industry emerging market representatives



The volume of coiled pipe, Q235B coiled pipe Q345B coiled pipe, large-diameter thin-wall coiled pipe, large-diameter thick wall coiled pipe, stainless steel coiled pipe, L360 coiled pipe, 16Mn coiled pipe and other special products have increased accordingly. With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting have been gradually recognized. NC cutting not only greatly improves the rate of plate and product quality,Q235B large diameter welded pipe, but also improves the working environment and labor efficiency. At present, the NC cutting machines used in the thick wall coil 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 NC cutting machines are NC 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, which is mainly reflected in: 90% of the developed thick wall coiled pipe processing industry is digital control cutting machine, and only 10% is manual cutting; The CNC cutting machine only accounts for part of the total blanking. 10%, of which the proportion of NC plasma cutting is small. In industrial production, the thermal cutting of thick wall coiled pipe generally includes gas cutting, plasma cutting, laser cutting and so on. Among them plasma cutting has a wider cutting range than gas cutting More efficient. Fine plasma cutting technology is close to laser cutting in material cutting surface quality, but the cost is much lower than laser cutting. Therefore, since the successful development of the United States in the mid-1950s, plasma cutting has developed rapidly. With the rapid development of computer and digital technology, NC cutting is also developing, which improves the machining accuracy. It shows great advantages in saving materials and improving labor productivity. This leads to the development of plasma cutting technology from manual or semi-automatic to NC, which has become one of the main directions of NC cutting technology. NC plasma cutting technology is a set of high-tech technologies such as NC technology, plasma arc characteristic research, power electronics and other disciplines. The CNC cutting technology began in the 1980s,Q460b straight seam welded pipe, and the CNC plasma cutting technology was later. However, recently, some domestic universities, research institutes and manufacturers have studied NC plasma cutting technology and gradually developed and produced various specifications of NC plasma cutting equipment, narrowing the gap of foreign advanced technology. 20 old brands, price

The material of large-diameter steel plate coil is mainly carbon steel, including Q19 q23 q34 t-welded large-diameter steel plate coil,Q550b reel, with a general steel plate thickness of 16mm. Large diameter coil is a kind of welded pipe product with simple and flexible process in large-diameter welded pipe. The manufacturer of large-diameter steel plate coil must connect two or more steel pipes, so the process of large-diameter welded pipe is relatively flexible, convenient and applicable. The disadvantage is that it can not carry out the production of mechanized assembly line.

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, steel casing, 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.

OK or not?.Deviation reel as follows (unit: mm): nominal diameter & amp; amp; lt; 800 800 to 1200 1300 to 1600 1700 to 2400 2600 to 3000 perimeter Deviation & plusmn; 5± 7± 9± 11± 13 ovality is 1% of the outer diameter 4 6 8 10 and no more than 4 steel plate coils have standards. At present, we carry out construction according to the acceptance of standard GB / t19793-92.

The distance between the two longitudinal slits of the reel assembly shall be greater than 100mm. The distance between the outer wall of the branch pipe and the weld shall not be less than 50mm.

The weld reinforcement is increased the weld formation is deteriorated and the edge transition is poor.


Q355b welded pipeAnalysis of industry emerging market representatives



In the production process, the hot-rolled steel pipe has the characteristics of no raw materials that is, the mechanical properties of thick wall steel plate. In this way, the steel plate is heated first and then rolled, which softens the steel plate under great conditions, which will not affect the material quality, nor damage the properties such as strength, the specification and model of thick wall steel pipe are added.

analysis.After pushing, 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, nickel and other impurities will be deposited on the surface of the cathode lead plate, which will affect the conductivity of the cathode surface of the steel coil tube, resulting in the decrease of current, the negative removal of the polished surface, and seriously affect the polishing quality. Therefore, the deposits on the cathode plate shall be removed in time. Sometimes a hard thick film is formed, which can only be removed by knocking, and then washed clean, large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory, old brand, price advantage and quality guarantee! Sometimes there are two welds for large-diameter thick wall coiled pipe. Why does this happen? It is mainly due to the problems of raw materials and equipment processing. The steel plate with the required width of large-diameter welded pipe required by the customer is not produced by the steel plant, so the two plates must be welded, so this kind of weld occurs. The main problem of large-diameter 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 large-diameter thick wall coiled pipe is mainly ultrasonic flaw detector, and the longitudinal weld on the same barrel section of the 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.

Cold rolled thick wall continuous pipe is similar to cold rolled thick wall continuous pipe, with wall thickness of 20mm and outer diameter of 450-3000mm. Steel plate is directly rolled, welded, formed, butted and reinforced. Cold rolled thick wall pipe has the characteristics of short processing time, fast delivery and low cost. Cold rolled thick wall pipe is mainly used for: pipe, billboard, column, etc.

When the pipe is rolled, the distance between the two welds shall be greater than 100mm