Square cold-formed hollow section steel is a section steel with square cross-section shape and size made of hot-rolled steel plate after cold-bending and then high-frequency welding. It is also called welded square steel pipe. The section steel has a stable production process and high precision, and

In recent years, using hot-rolled coils as raw materials, the process of HFW high-frequency welding + thermal tension reduction + full tube body heat treatment has been widely used to produce high-precision, high-grade steel casings. In production applications, it is found that the quality of hot-ro

During the welding operation, the phenomenon that the magnetic arc blowing affects the welding process sometimes occurs. The formation of the magnetic arc blow is the result of the presence of residual magnetism in the pipe metal.Generally, residual magnetism is divided into two types: induction mag