Butt welded elbows can be corroded in inaccurate use. After butt welded elbows are corroded, the pipe wall of butt welded elbows usually becomes thinner, and one-sided pits and pits appear. Detection method of butt welding elbow after erosion: The basic principle of flux leakage detection is based on the basic characteristic of high permeability of ferromagnetic material.

The magnetic permeability of the erosion defect of the butt welding elbow is much lower than that of the butt welding elbow. The butt welding elbow is magnetized under the action of an external magnetic field. When the butt welding elbow is intact, most of the magnetic field lines pass through For steel pipes, the magnetic field lines are evenly dispersed at this time; when there are defects in the butt welded elbow, the magnetic field lines bend, and some of the magnetic field lines leak out of the surface of the steel pipe. By detecting the leakage flux from the surface of the magnetized butt welded elbow, it can be inferred whether the defect exists. Ultrasonic method Ultrasonic detection method is to defraud the principle of ultrasonic pulse reflection to measure the thickness of the tube wall after erosion. This process adopts the self-extending centrifugal casting method to form, focusing on the chemical reaction of the substance itself, the exothermic incineration generates high temperature, and the technique of merging new substances in the incineration wave extension process.

During testing, the probe is vertically transmitted to the inner wall of the butt welded elbow. The probe first takes over to the reflected pulse from the inner surface of the pipe wall, and then the ultrasonic probe takes over the reflected pulse from the outer surface of the pipe wall, which reflects the inner surface. The distance between pulses reflects the thickness of the tube wall. Simmering bend: refers to the processing of pipes into butt welded elbows, usually refers to metal pipes and electrical PVC threading pipes for water and electricity; simmering butt welded elbows: refers to metal butt welded elbows for water supply and drainage, small pipe diameter butt welding The elbow may be obtained by simmering.