Rectangular tubes are widely used in our daily life. It can be said that steel pipes not only reduce the weight of supports, save building materials, but also make construction easier and easier. So, how to identify fake and inferior rectangular tubes?

The performance of the thick-walled square tube determines its use.In recent years, the thick-walled square tube has been used in the truss structure of airport terminals, stadiums and exhibition centers due to its beautiful appearance, reasonable stress and relatively simple node handling. It is widely used as a steel member in the system and curtain wall support system.

LSAW steel pipes have several flaw detection tests. LSAW steel pipes are now used more and more widely. According to different projects, the standards for using steel pipes are also different. Generally speaking, steel structures, piling, sewage discharge pipes, etc. There is no requirement for flaw detection of steel pipes, no need for flaw detection.

High-frequency welded pipes (ERW) need to go through a series of processes from raw materials to finished products. The production process flow mainly depends on the product variety. The completion of these processes requires various mechanical equipment and welding, electrical control, and testing devices. These equipment and devices are in accordance with different The technological process requires a variety of reasonable arrangements.

The submerged arc welding process(SAW) is suitable for the requirements of heavy industrial applications such as pipelines, pressure vessels and tanks, locomotive manufacturing, heavy construction, and excavation. It is suitable for industries that require high productivity, especially those involving very thick materials, and can be buried from There are many benefits obtained in the arc welding process. Its high deposition rate and walking speed have a significant impact on the productivity, efficiency and production cost of workers. This is also one of the key advantages of the submerged arc welding process. Other benefits include: Excellent chemical composition and mechanical properties, improved working environment comfort and good weld shape and weld toe line.

The carbon element in the seamless steel tube (smls) has a great influence on its own performance, so when the seamless tube is decarburized, its service life will be greatly reduced, and if the surface of the seamless tube is decarburized If it is not cleaned, the hardness and wear resistance of the surface layer of the seamless pipe will be reduced, and during quenching, cracks will be formed on the surface of the workpiece due to the different volume changes of the inner and outer layers. Therefore, how to prevent the surface decarburization of seamless pipes is a problem that should be paid attention to in the production process.

At present, large-diameter thick-walled steel pipes, large-diameter thick-walled seamless steel pipes, small-diameter thick-walled seamless steel pipes, special thick-walled steel pipes, large-diameter coiled pipes, thick-walled coiled pipes and other series of thick-walled steel pipes have been formed. It replaces the same standard imported steel pipe and is applied to hydraulic system piping.

After removing the root of the weld, double-sided weldments should be inspected. When using the oxyacetylene flame to cut the welding fixture on the alloy pipe that has a tendency to harden, defects in the ground part will be found. Radiographic testing and ultrasonic testing The main targets of radiographic testing and ultrasonic testing are the butt joints of straight seam steel pipes and the butt joints of butt welded pipe fittings.