There are many types of steel pipes, which can be divided into straight seam steel pipes and spiral steel pipes according to the welding method. Because the two steel pipes have different welding methods, the performance is also different.
According to the different uses of the steel pipe, the welded pipe can be subdivided into the following types: General Welded pipes, wire casings, automotive pipes, oxygen-blowing welded pipes, etc. There are many classifications of steel pipes in practical applications, so I won't list them all here.
General welded pipe: The main function of general welded pipe is to transport some fluid. In the manufacturing process, general welded pipe is made of low carbon steel, which is easy to be welded by electric welding. This steel pipe should meet the specifications of thickened steel pipe. The nominal pressure pipe should be pressured and bent. In order to pass such tests, the manufacturing process and quality of general welded pipes are required. Although the delivery length of general welded pipes is 4 to 10 meters, it is not fixed and can be adjusted according to customer needs. With the continuous development of modern welded pipe technology, the quality of straight seam steel pipes is getting better and better. At present, straight seam steel pipes can replace most steel pipes and have many applications in engineering.
Metric welded pipes: Metric welded pipes have the same specifications as stainless steel pipes. Metric welded pipes are based on ordinary carbon steel, high-quality carbon steel or low-kinetic energy modified alloy steel, and then adopt hot and cold strip electric welding, or use hot strip and electric welding technology It is made by welding and cold drawing.
Spiral welded steel pipe: The high carbon steel strip is cold rolled into a tube blank according to the helix angle (called forming angle) that can be set by the general structural steel or low alloy structure, and then the pipe joints are welded together to make a large straight seam steel pipe , Spiral welded pipe is suitable for petrochemical transportation, and its specifications mainly depend on the type of steel pipe. Spiral welded pipe has single-sided and double-sided welding and front and back welding. The welded pipe should ensure welding and pressure test, and the design requirements of good compressive strength and cold drawing performance.
Note: astm a53 pipe is a general, all-purpose pipe used in generator plants, refineries, compressor stations, natural gas transmission, and steam conduction. It is acceptable for welding, flanging, and bending.
Three production processes of welded pipe
This time we mainly introduce welded steel pipe, that is, welded steel pipe. Its production is to bend the tube blank (steel plate and steel strip) into the required cross-section shape and size tube by various forming methods, and then weld the weld by different welding methods to get the steel pipe.
The influence of welded pipe blank width consumption
Welded pipe blank is the raw material for manufacturing welded pipe. Its mechanical properties and chemical composition have a far-reaching impact on the quality of welded pipe. Its width is an important factor to determine the weld strength. We usually say that the appropriate width of welded pipe blank refers to the width of a given thickness. The determination of the width is restricted by many factors.
Advantages of tube truss
In recent years, various forms of steel structures have been widely used in large space buildings such as stadiums, airports, stations, equipment production lines, convention and exhibition centers, and theaters. The tube truss structure is a part of the steel structure and is used extensively.
