Welded steel pipe, also called welded pipe, is a steel pipe made of steel plates or steel strips that are welded after being curled and formed. The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and the equipment investment is low, but the general strength is lower than that of seamless steel pipes.
Since the 1930s, with the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, the quality of welds has continued to improve, and the varieties and specifications of welded steel pipes have increased day by day, replacing unfinished steel pipes in more and more fields. Sewing steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of the weld. Welded steel pipes are widely used in construction, petroleum, chemical industry, light industry, machinery and other fields. The following article will discuss the advantages and disadvantages of welded steel pipes in detail.
Advantages of welded steel pipes:
1. High efficiency and energy saving
The welding process of welded steel pipes uses advanced welding technology and materials, which results in high welding efficiency and low energy consumption. Compared with traditional pipes, it can greatly reduce costs and energy consumption. In addition, the specifications and length of welded steel pipes can be customized as needed, making them more convenient in transportation and installation.
2. Excellent mechanical properties
Welded steel pipes have thicker walls, higher strength and stiffness, and can withstand greater pressure and impact. At the same time, due to its excellent mechanical properties, welded steel pipes can be used in various complex terrains and environments, such as mountains, rivers, bridges, etc.
3. Good corrosion resistance
Welded steel pipes are specially treated and have better corrosion resistance. In corrosive media such as acids, alkalis, and salts, welded steel pipes can operate stably for a long time, ensuring the safety and service life of the pipeline.
4. Good pressure resistance
Another important advantage of welded steel pipe is its excellent pressure resistance. The use of welding technology makes the wall of the steel pipe uniform and dense, which can effectively improve the pressure resistance of the steel pipe and enable it to withstand greater internal pressure. Therefore, welded steel pipe is an indispensable pipeline material in some occasions that require high pressure resistance of pipelines, such as petroleum, natural gas, chemical industry and other fields.
5. High strength
Welded steel pipes use high-temperature fusion welding technology, which can effectively improve the strength and hardness of the pipe. The welded steel pipe not only has excellent strength and stiffness, but also can withstand greater pressure and load. Therefore, welded steel pipes are widely used in some situations that require high strength and stiffness of pipes, such as large machinery manufacturing, shipbuilding, pressure vessels and other fields.
6. Stable quality
Because welded steel pipes adopt a series of precise production processes and quality control measures, their quality is stable and reliable. In particular, the welding process adopts automated production technology, which greatly improves the quality stability of steel pipes, avoids many problems caused by different technical levels of workers or poor welding joint quality in manual welding, and ensures the quality of steel pipes and welding quality.
7. Convenient construction
Another advantage of welded steel pipes is that they are easy to construct and can quickly complete the pipe welding work and improve construction efficiency. Compared with traditional cast pipes, welded steel pipes have a more flexible construction method and can be cut and spliced as needed, making them suitable for various occasions.
8. Environmental protection and health
During the production and use of welded steel pipes, no harmful substances and odors will be produced. At the same time, due to its good corrosion resistance, it can reduce the cleaning and maintenance work of pipelines and reduce the impact on the environment.
9. Reusable
Welded steel pipes have thicker walls and can be reused multiple times after inspection and treatment. This not only reduces costs, but also reduces resource waste and environmental pollution.
10. Wide range of application
Welded steel pipes are suitable for various fields and industries, such as construction, petroleum, chemical industry, light industry, machinery, etc. Its excellent mechanical properties and corrosion resistance enable it to operate stably in a variety of environments.
Disadvantages of welded steel pipe: Seamlsss VS Welded Pipe
1. Welding is not firm
During the welding manufacturing process, if the welding technology is not up to standard, the joints may have problems such as incomplete penetration and unsealed welds, which may lead to water leakage, air leakage, etc. after welded pipe construction.
2. Susceptible to corrosion
Because the surface of the welded pipe does not receive special anti-corrosion treatment, if it encounters high humidity, high oxides and other environments during use, it is easy to cause rust and wear on the surface of the welded pipe. Compared with
seamless steel tubes, the welds of straight seam welded pipes are more susceptible to corrosion by chemical substances. During use, if harmful substances such as strong acids and alkalis are encountered, the metal structure at the weld may be corroded, resulting in pipeline failure, rupture, leakage and other safety issues.
3. Poor surface quality
Since the production process of straight seam welded pipes requires multiple processes such as billet curling, cold bending, and heat straightening, it is difficult to guarantee the surface quality of the pipes. For example, unevenness in the welding joint, residual moisture, grease and other impurities will adversely affect the performance and service life of the pipeline.
4. The pressure resistance is not as good as seamless steel pipe
There is a certain degree of stress concentration in the internal welds of straight seam welded pipes, but seamless steel pipes do not have this defect. This makes the straight seam welded pipe have limited pressure resistance under harsh conditions such as high temperature and high pressure, and is prone to cracks, deformation and other problems.
5. Poor dimensional accuracy
Due to the influence of the production process, the dimensional accuracy of straight seam welded pipes is often worse than that of seamless steel pipes. In some situations, such as applications that require high-precision processing and high sealing performance, straight seam welded pipes may not be suitable.
In summary, although welded pipes have low prices and production costs, their shortcomings are also obvious in some applications. Therefore, only by correctly selecting the type of steel pipe and strictly controlling the environment in which the pipe is used can we make the most of its advantages and avoid its shortcomings from causing losses to the project and users.
