What Is The Best Way To Weld Steel Pipe?

The welded steel pipe has a wide range of applications, including general use, high temperature, and high pressure, among others. The latter is frequently made of special alloy steel, and the issue of shrinkage cracks in the welding process, as well as the mechanical properties of the heat-affected zone pipe, must be addressed. Because of the influence of welding operations, it does not change significantly.

Pipes made of relatively thin materials, such as steel strips, can be welded by high frequency, and some thin-walled pipes can be welded by the shielding gas method; pipes with a wall thickness greater than 2mm can be welded by hand arc welding.

The small diameter of the pipe can only be welded on one side, and the technician can drill into the pipe to perform welding on both sides. To form one-sided welding, two welders are required. The steel ball test ensures that the cross-sectional area passing ability and welding seam forming meet the design specifications.

As long as the pipe material is high-strength alloy steel, such as temperature-resistant, pressure-resistant, wear-resistant, and low-temperature-resistant alloy steel pipes, the welding process must concentrate on preventing martensitic structures and cracks caused by high-temperature welding operations. The general requirement in the process is that the welding rod is carefully selected, baked, and delivered to the welder in accordance with the specifications. Remove all oil, water, rust, and debris from both sides of the weld before welding, and keep the welding line as clean as possible. Smaller, minimize swing during the welding process, and the last weld should have as much of an annealing effect on the heat-affected zone as possible.

Welders must be trained, tested, and qualified for the job in order to ensure the quality of the welding on the pipes. The steel pipe must be properly welded by the welder. He must consider operation skills in addition to the basic theory. The pipe welding process may include several postures such as down welding, vertical welding, and overhead welding (in the case where the pipe cannot be rotated). The stability and forming of the arc can be controlled during the process of welding and overhead welding (some tubes are not very large, and the current cannot be adjusted halfway through forming at one time), and the arc can properly oscillate.

Since the 1930s, with the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, weld quality has been continuously improved, the varieties and specifications of welded steel pipes have grown, and non-ferrous steel has been replaced in an increasing number of fields. Steel pipe with a seam. Welded steel pipes are less expensive and more efficient to produce than seamless steel pipes.