Ultrasonic testing special probe for butt girth welding of austenitic stainless steel pipe

An austenitic stainless steel and ultrasonic technology, which is applied in the direction of material analysis, measuring devices, and instruments using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as poor consistency and repeatability of test results, great difficulty in application, and no effective detection. , to achieve the effects of defect quantification and positioning, less cluttered echoes, and enhanced reliability

Active Publication Date: 2014-08-06
化学工业设备质量监督检验中心 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Using the above method for detection, the consistency and repeatability of the detection results of different operators are poor, and the practicability is not strong
In particular, the ultrasonic testing of butt girth welds of small-diameter austenitic stainless steel pipes with an outer diameter of Φ34-Φ168mm and a wall thickness of 3.5-20mm is very difficult to apply, and JB / T4730 "Nondestructive Testing of Pressure Equipment" has no corresponding The main reason is that there is no probe (ultrasonic transducer) for effectively detecting the butt girth weld of small-diameter austenitic stainless steel pipes.

Method used

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  • Ultrasonic testing special probe for butt girth welding of austenitic stainless steel pipe
  • Ultrasonic testing special probe for butt girth welding of austenitic stainless steel pipe
  • Ultrasonic testing special probe for butt girth welding of austenitic stainless steel pipe

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Experimental program
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Effect test

Embodiment 1

[0034] For the Φ34 probe test block combination with the smallest arc, the distance-amplitude curve was made and the system was tested. The 02# probe was selected with a specification of 2.5MPz (6×11)×2 / Φ34, and the arc surface of the comparison test block R25 and R50 was used. The front edge of the test probe is 6.5mm, the zero point of the test probe is 5.53μS, and the calibrated sound velocity is 5698m / s. The hole depth in the sound pressure 6dB linear attenuation zone is detected. The test results are shown in Table 2. The base line of the distance amplitude curve is as follows Figure 4 , H6mm horizontal through hole 80% wave height test signal-to-noise ratio up to 19dB.

[0035] Table 2 Φ34 arc top comparative test block horizontal through hole test

[0036]

Embodiment 2

[0038] 01#Φ114 radian special probe (probe specification is 2.5MPz (20×30)×2 / Φ114) was used to test the Φ108×16mm artificial defect simulation tubular test block. The artificial defects on the simulated test block are: two centerline grooves on the outer surface of the weld with a depth of 1mm / width 0.4mm / length 10mm and a depth of 2mm / width 0.4mm / length 10mm from the outer surface of the pipe wall, and two distances from the outer surface of the pipe wall Inner surface depth 1mm / width 0.4mm / length 10mm, depth 2mm / width 0.4mm / length 10mm centerline groove on the inner surface of the weld, such as Figure 5 . Select 3# special probe (the probe specification is 2.5MPz (9×16)×2 / Φ114) to test the Φ114 arc top comparison test block, use the comparison test block R25 and R50 arc surface to test the front edge of the probe is 12mm, and the zero point of the test probe is 14.71 μS, the calibrated sound velocity is 5685m / s, and the horizontal through hole close to the sound pressure 6...

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Abstract

The invention discloses an ultrasonic testing special probe for butt girth welding of an austenitic stainless steel pipe. The probe adopts a send-receive double crystal focusing structure, so that geometrical scattering of the inner wall of a steel pipe is reduced, and random and interfering echo caused by a wedge block is reduced; an inward concave curved surface is arranged at the bottom of a delay tapered wedge, so that the top of the inward concave curved surface is in contact with the steel pipe to be tested; a horizontal polarized shear wave is generated in the austenitic stainless steel pipe by the special probe and cannot be converted into other types of waves when compared with other wave forms and reflected from the surface parallel to the polarization direction; random echo is less; the horizontal polarized shear wave is almost entirely transmitted into the weld metal, and the acoustic beam directional deflection is minimum when compared with other wave forms. The ultrasonic testing special probe can solve the technical problems that deficiencies are found in the sensibility, the signal to noise ratio and the resolution of ultrasonic testing for butt girth welding of small caliber austenitic stainless steel pipes with phi 34 mm to phi 168 mm external diameter and 3.5 mm to 20 mm wall thickness.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection of steel welds, in particular to the ultrasonic detection technology of austenitic stainless steel pipe butt girth welds. Background technique [0002] Ultrasonic testing of austenitic stainless steel welds is quite different from that of carbon steel. Since the metal grains of austenitic stainless steel welds are in a columnar coarse-grained structure, strong grain scattering and Attenuation, causing higher noise signal (forest wave), so that the strength of the received useful defect echo signal is reduced and submerged in the noise signal. At the same time, the anisotropy of the weld tissue will cause the ultrasonic beam to be twisted and deflected, thus The signal-to-noise ratio is greatly reduced, and the positioning error of the defect is also greatly increased. Therefore, the use of conventional ultrasonic probes has been unable to effectively detect austenitic stainless steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/24
Inventor 庄浩春马小强罗晓明杨惠谷李东胜张建华孙涛杨海军
Owner 化学工业设备质量监督检验中心
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