Magnetic flux leakage detection (MFL) means that after the ferromagnetic material is magnetized, a leakage magnetic field is formed on the inner and outer surfaces due to defects of the iron pipe. One can detect defects by detecting changes in the leakage magnetic field.
Welded steel pipe, also called welded pipe, is a steel pipe made by welding and forming a steel plate or strip steel. It is usually 6 meters long. The welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, and low equipment investment, but the general strength is lower than that of a seamless steel pipe.
Since the 1930s, with the rapid development of high-quality strip, continuous rolling production and the advancement of welding and inspection technology, the quality of welded joints has been continuously improved, the variety specifications of welded steel pipes have been increasing, and more and more fields have replaced Seam steel pipe. Welded steel pipes are divided into straight welded pipes and spiral welded pipes in the form of welds. Classified according to production methods: process classification - arc welded pipe, electric resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe.
Small-diameter welded pipe adopts straight seam welding, large-diameter welded pipe adopts spiral welding; according to the shape of the end of steel pipe, it is divided into round welded pipe and special-shaped (square, rectangular, etc.) welded pipe; it is divided into mining fluid according to material and use. Conveying welded steel pipes, galvanized welded steel pipes for low-pressure fluid transportation, and belt-welded steel pipes for belt conveyors. According to the specification table in the current national standard, the outer diameter* wall thickness is sorted from small to large.
The artificial defectcorrection sample tube
|Internal and external burrs are removed too shallow and weld seams are welded|
Differential coil or magnetoresistive element
99dB continuously adjustable
Blind zone setting
AC220V 250W adjustable
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