Small Diameter Seamless Pipe Ultrasonic Flaw Detection

Small diameter seamless pipe, can be called small diameter seamless pipe, small diameter seamless pipe can also be divided into: Seamless small diameter steel pipe and straight seam (also known as welding) small diameter seamless steel pipe, the general, in the outer diameter of the pipe 89mm below, 4mm above; can be collectively referred to as small-caliber seamless pipe. Today we study is a relatively physical problem, that is, small-diameter seamless pipe testing, the problem is more abstract, let's look at what the test is, how to detect small diameter seamless pipe.

Ultrasonic probe can realize the mutual conversion between electric energy and acoustic energy and the physical characteristic when ultrasonic wave propagates in elastic medium is the basis of ultrasonic testing principle of steel pipe. Directed emission of ultrasonic beam encountered in the tube propagation defects, both to produce wave reflection, but also produce wave attenuation. After the flaw detector signal processing, such as the use of reflection detection flaw, you can get a defect echo signal, such as the use of penetrating flaw detection, by virtue of the degree of attenuation through the waves to obtain the defect signal. Both may be given quantitative indications of defects by the instrument.

How to detect small diameter seamless pipe testing it? Generally the following steps:

Using the shear wave (or plate wave) reflection method (or penetration method) in the relative movement of the probe and the pipe under automatic inspection, only the special small-caliber steel pipe can be manually tested. Automatic or manual inspection should ensure that the sound beam scanning the entire surface of the tube.

Note: Automatic inspection of both ends of the pipe will not be able to effectively test, but this area should be controlled within 200mm. When longitudinal defects are examined, the sound beam propagates in the circumferential direction in the pipe wall. When the lateral defect is examined, the sound beam propagates along the pipe axis in the pipe wall. Inspection of longitudinal and transverse imperfections shall be made in two opposite directions of the pipe. The supplier only checks for longitudinal defects when the demand side has failed to test for horizontal defects. As agreed by both supply and demand parties, the inspection of vertical and horizontal defects may be conducted in only one direction of the pipe. Automatic or manual inspection should be used when the coupling effect is good, and does not detract from the coupling medium on the surface of the pipe.

A worker from a steel pipe company, which is located in China.