how to handle seamless steel pipe with magnetic

In the construction and maintenance of oil pipeline, the magnetic blow phenomenon will affect the welding at times. The reason of magnetic blow phenomenon is the metal present in remanence. Usually, the remanence is divided into two types: induced magnetism and processed magnetism. The induced magnetism for the seamless steel pipe is often produced in the factory like the metal smelting. When you use electric magnetic crane for the loading and unloading, the seamless steel pipe is parked in a strong magnetic field, but it is little impact the inspection because of perfect magnetization method. The steel pipe placed is closed to power line and it will produce great electromagnetic field. Magnetic assembly is usually generated during the welding operation and using the magnetic holder, clamps and pipe welding such as bar wire welding clamp and pipe segment or short-circuit. For example it is long time to contact with electrical conductors supplying the DC power.



When welding magnetic the seamless steel tube, it is often difficult for you to ignite. Arc burning stability is destroyed. In the arc field, the liquid metal and slag melting body is spattered in the welding pool. In order to stabilize welding process and improve the quality of welding fitting magnetized steel pipe need degaussing before welding. However, it points out that it is hard to complete the demagnetization for the welded seamless steel pipe. So it allows the welding the pipe, when the remanence does not influent welding quality.