Chengdu steel structure pillar with spiral steel pipe manufacturer

Chengdu steel structure pillar with spiral steel pipe manufacturer

Spiral steel pipe for steel structure pillar widely adopts double-sided submerged arc welding welding technology, the following is a brief discussion of the formation process and characteristics of submerged arc automatic welding. The principle of submerged arc welding: submerged arc welding is the use of arc heat energy for welding, and manual electrode arc welding is different: the welding wire of submerged arc welding is exposed, there is no paint on it, submerged arc welding does flux is pre-laid in the place to be welded, submerged arc welding wire extends into the flux, arc is the formation process of submerged arc welding burning under the flux is such a welding wire and workpiece contact, press the start button, the moment the welding wire and the workpiece are energized, the welding wire is withdrawn, the arc ignites, the welding trolley goes forward, the welding wire is continuously transported downward, Maintain the arc to burn under the flux layer, forming a weld pool below the arc. Around the arc, the flux melts to form a void. This cavity and the molten pool continue to advance, while the metal behind the molten pool solidifies, forming a continuous weld. Since this process is carried out under flux, we cannot see it with the naked eye. With the help of X-ray photography, it can be seen that because the spiral steel pipe adopts the welding technology of submerged arc automatic welding, in addition to this kind of high production efficiency; Less production assistance time, saving the time to change welding rods; The welding conditions are clean and spatter-free, saving the time of cleaning; The weld seam quality is high. It also provides the necessary conditions for the delivery of spiral welded pipe factories, so that the production time of large quantities of spiral steel pipes is guaranteed, so it is still widely used. According to the quality inspection results of spiral steel pipes, spiral steel pipes are usually divided into three categories: qualified products, reworked products and waste products. Qualified product refers to the spiral steel pipe whose appearance quality and internal quality meet the relevant standards or technical conditions for delivery acceptance; Reworked products refer to spiral steel pipes whose appearance quality and internal quality do not fully meet the standards and acceptance strips, but are allowed to be repaired, and can meet the standards and acceptance conditions after repair; Scrap refers to spiral steel pipes whose appearance quality and internal quality are unqualified, and are not allowed to be repaired or still fail to meet the standards and acceptance conditions after repair.

Spiral steel pipe

storage method of spiral steel pipe for steel structure pillar has a lot to do with its service life, and consumers need to store the spiral steel pipe correctly. The staff of the spiral steel pipe manufacturer also shared his correct storage method for everyone. First of all, we need to store the near-spiral steel pipe in the warehouse, not in the open air. And need to ensure that the storage warehouse is clean and tidy, but also to have a good drainage environment, if there are weeds or other debris on the ground, need to be cleaned and then stored, this is to keep the spiral steel pipe clean. Corrosive gas will have a corrosive effect on the spiral steel pipe, and the contact of acid, alkali, salt and other substances with the spiral steel pipe will also have a corrosive effect, so we need to do a good job in the protection of the spiral steel pipe to avoid these substances and its contact. In the process of storage, we also need to do a good job of classification, this is to avoid the inconvenience of use. We also need to carry out regular inspection of the spiral steel pipe, if the spiral steel pipe is found to have rust phenomenon, we also need to remove the rusted product in time, and analyze the cause of rust, and avoid the rust of other spiral steel pipes through correct treatment. Judging from the surface, that is, in the visual inspection. The appearance inspection of welded joints is a simple and widely used inspection method, which is an important content of finished product inspection, mainly to find defects and dimensional deviations on the surface of the weld. It is generally inspected by the naked eye with the help of tools such as standard templates, gauges and magnifying glasses. If there is a defect on the surface of the weld, there is a possibility of defects inside the weld. Physical method test: Physical test method is a method of measuring or testing some physical phenomena. The inspection of internal defects of materials or workpieces is generally done by non-destructive testing. Non-destructive testing includes ultrasonic flaw detection, radiographic flaw detection, penetration testing, magnetic flaw detection, etc. Strength test of pressurized vessel: In addition to the tightness test, the strength test of the pressurized container is also carried out. There are two common types: hydrostatic test and barometric test. They all test the weld compactness of vessels and pipes operating under pressure. The air pressure test is more sensitive and fast than the water pressure test, and the tested product does not need to be treated with drainage, which is especially suitable for products with difficult drainage. However, the test is more dangerous than the hydrostatic test. When conducting the test, the corresponding safety technical measures must be observed to prevent accidents during the test. Compactness test: the non-dense defects of the welded seam of the welded container storing liquid or gas, such as penetrating cracks, porosity, slag inclusion, unwelded penetration and loose structure, etc., can be found by the compactness test. Compactness test methods include: kerosene test, water carrying test, water flushing test, etc. Hydrostatic test each steel pipe should do hydrostatic test without leakage phenomenon, test pressure press test to calculate P=2ST/D in the S-hydrostatic test stress Mpa, hydrostatic test according to the corresponding steel strip standard specified yield * small value (Q235 is 235Mpa) 60% of the selection. Regulation time: D< 508 test pressure holding time is not less than 5 seconds; D≥508 test pressure holding time is not less than 10 seconds4 Non-destructive testing steel pipe repair weld, steel belt head weld and circumferential seam should be X-ray or ultrasonic inspection. For the spiral weld of the steel direction used for combustible ordinary fluid transportation, 100% SX ray or ultrasonic inspection should be carried out, and the spiral weld of the steel pipe used for the transportation of ordinary fluids such as water, sewage, air, heating steam should be X-ray or ultrasonic inspection spot check (20%).

Spiral steel pipe

Spiral steel pipe for steel structure pillars Under the support of so many more favorable factors, we should not be too pessimistic about the future market. As the so-called no polar tailai, when the market of Hebei spiral steel pipe factory is completed, it is the day when the market rebounds and goes well. Compared with the increasing supply, the domestic demand for construction steel is not optimistic. It is understood that subject to the impact of long-term policies such as "stable growth and structural adjustment" of the domestic economy, the economic data for this year's quarter and April were lower than expected. The data shows that the growth rate of investment, consumption, industrial added value, social electricity consumption, real estate investment and new housing construction area of the four companies has decreased to varying degrees. Although under the influence of the "radical policy" policy recently, some data have unexpectedly improved, such as 5 domestic manufacturing PMI 50.8%, up 0.2% from 4. However, from the perspective of the overall market situation, it does not mean that domestic economic policies have completely improved. From the specific downstream situation, the 6 parts of East China will face the rainy season, and the gradual increase of high temperature weather in China will also have a certain impact on the downstream engineering construction, which will drag down the normal release of downstream demand to a certain extent, so it is expected that the entire 6 downstream demand will not improve significantly. At this stage, the government still has many doubts in the implementation of the strength, if the government can persistently implement the regulations issued by China, not biased, selfless, and brave to be ruthless, for example, Lianhua Steel Structure Spiral Steel Pipe Factory directly takes the unqualified sewage in the running steel mill to operate the knife, control the actual output value, then it is conceivable that it will quickly benefit the steel market supply and demand, Lianhua Steel Structure Spiral Steel Pipe Factory is unlikely to be involved in the strange circle of more and more production capacity. In fact, at some times, the reason why the implementation of some regulations is not funded, because there are many questions to think about in practice, and there are a series of very complex questions on the back of the screening of backward production capacity, if you want to forcibly shut down some steel mills with unqualified emissions, Lianhua spiral steel pipe factory on the local government's tax revenue, laid-off employees reemployment, etc. will have an obscure impact. Sometimes it's not that the government doesn't want to do it, but it doesn't dare to do it. Although at this stage, the routine and even the screening of backward production capacity as a performance appraisal, so adjusted, at this stage the regional government began to be ruthless, but who knows whether it can stick to it for a long time. If we only stop to make gestures, and after the boom of work recedes, Lianhua Spiral Steel Pipe Factory starts production again, then it is impossible to deal with the question of screening backward production capacity. There is also a situation that the government has indeed reduced production capacity, but the capacity he has cut has little impact on the later steel market capacity, perhaps no impact.