High Frequency Welded Steel Pipes in Spiral Seam for General Fluids Pipeline
High frequency welded steel pipe has been widely used in recent years with the development of modern production technology. Most welded steel pipes are formed by rolling a strip of steel into a circular shape and then welding or continuous welding along the length of the weld. The products made by this process include a wide range of sizes and material grades, suitable for a variety of applications.
With the increasing demand for steel pipes in the fields of gas transportation and water supply, as well as general fluid transportation, it has become necessary to develop a new high-frequency welded steel pipe with improved performance.
High frequency welding consists of two processes, one is welding and the other is thermal compression. Therefore, the design must include a good welding line. The welding must be carried out on both sides of the weld beads with an optimized welding angle. This is to ensure that the weld with a good overall strength and airtightness. In addition, the welding line must be free of pressure, welding speed should be maintained stable, and welding gaps should also be appropriately controlled.
In order to meet its function, the steel pipe needs to be capable of forming a certain strength spiral seam weld. The high frequency welding process uses an alternating current with a frequency of 50 - 60 Hz and the electrodes is arranged in the seam in a multilayer. The distance between the electrodes and the temperature of the weld should also be accurately controlled to achieve satisfactory results.
The use of high frequency welded steel pipes for general fluid transportation pipelines offers many advantages. They are relatively lightweight, easy to transport and install. However, compared to traditional welded steel pipes, they have a shorter service life due to the potential for corrosion and reduced internal strength. Therefore, special attention should be paid to corrosion protection and other aspects when selecting materials for the pipeline.
Sy/T 5038-92 is the relevant code for high frequency welded steel pipes used in general fluid transportation pipelines. Since the implementation of this code, there are more rigorous requirements for materials and construction processes and a series of tests to ensure the safety of the product. The materials used should meet the relevant national standards, such as SY 5038-83, SY 5039-83, and other similar standards.
In conclusion, high frequency welded steel pipes are increasingly used in general fluid transportation pipelines due to their light weight and easy construction. The relevant code Sy/T 5038-92 is strictly enforced to ensure the safety of the product and the process. Manufacturers are expected to use materials and processes that are in conformity with the relevant national standards, such as SY 5038-83, SY 5039-83, and other similar standards.
