ERW steel pipe is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current heating effect of the electric charge, so that the steel at the edge of the weld is locally heated to a molten state, and the butt welding is achieved through the extrusion of intergranular bonding, so as to achieve The purpose of welding.

Fine and messy molds should be pre-heated to eliminate the residual stress that occurs during machining. For fine and messy molds, if the conditions permit, try to use vacuum heating quenching and cryogenic treatment after quenching.

The equipment can continuously roll seamless steel, Pilger rolled seamless steel, longitudinally welded pipe, spiral welded pipe, etc. It can be directly installed on the production line for online measurement, or installed on the flaw detection line and inspection line to measure the outer diameter of the finished pipe.

When the friction force increases, the positive pressure on the strip increases, and the deformation of the strip increases, which causes the roller to strain the strip and produce surface scratches.

Defects produced in the actual production of high-frequency welded pipes are sometimes not caused by one cause, but are usually the result of a combination of multiple factors.

Seamless steel pipe quality inspection is divided into the following aspects: chemical composition analysis; steel pipe geometric size and shape inspection; seamless pipe steel surface quality inspection; seamless pipe steel management performance inspection; seamless pipe steel pipe process performance inspection; none Metallographic analysis of seam pipe and steel pipe.