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Ultrasonic detection method for austenitic stainless steel butt welding joint

A technology for austenitic stainless steel and welded joints, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, reduce greenhouse gases, and instruments. It can solve the problems of impact judgment and repair, large deviation in defect quantitative positioning, and many grass-like echoes.

Active Publication Date: 2020-06-19
CHINA NAT CHEM ENG THIRD CONSTR +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Austenitic stainless steel welds have coarse grains, columnar grains and anisotropy, which produce strong absorption and scattering of ultrasonic waves, resulting in large loss of sound energy, many grass-like echoes, and large deviations in quantitative defect positioning, which seriously affect the determination and accuracy of defects. rework
[0003] With the application of austenitic stainless steel in the petrochemical, pharmaceutical, and aerospace fields more and more widely, in order to be able to realize ultrasonic testing in austenitic stainless steel welds, it is necessary to take special technical measures and carry out experimental verification. However, there are few such techniques to detect weld defects

Method used

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  • Ultrasonic detection method for austenitic stainless steel butt welding joint
  • Ultrasonic detection method for austenitic stainless steel butt welding joint
  • Ultrasonic detection method for austenitic stainless steel butt welding joint

Examples

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Effect test

Embodiment 1

[0040] like Figure 1-10 As shown, the ultrasonic testing method of austenitic stainless steel butt welded joints includes the following steps:

[0041] Step S1, ordering probes: order several dual-crystal focusing longitudinal-wave oblique probes according to requirements. The probe data is shown in the table below. According to actual needs, 2P8×10K1, K2, 2P6×6K1, and K2 longitudinal-wave oblique probes can be used for supplementary scanning;

[0042] serial number angle of refraction Nominal frequency (MHz) Depth of focus(mm) wafer size 1 70° 1.5、2.0、2.5 20 8×12mm 2 60° 1.5、2.0、2.5 20 8×12mm 3 45° 1.5、2.0、2.5 20 10×12mm 4 45° 1.5、2.0、2.5 40 10×12mm

[0043] Step S2, make test block:

[0044] 1) Use the same specifications and materials as the test piece to make a special comparison test block for austenitic pipeline weld inspection. The comparison test block includes A-type comparison test block and B-type compariso...

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Abstract

The invention relates to an ultrasonic detection method for an austenitic stainless steel butt welding joint. The ultrasonic detection method comprises the steps of S1 customizing a probe; S2 preparing a test block; S3 making a distance-amplitude curve; S4 carrying out detection preparation; S5 carrying out detection; and S6 evaluating defects. According to the ultrasonic detection method for theaustenitic stainless steel butt welding joint, after comparing and detecting of a defect part, ir-192 source ray detection and on-site actual dissection are carried out on the austenitic stainless steel weld joint; a comparison detection result completely matches a radiograph and an anatomical result, which proves that ultrasonic detection can be effectively conducted on the austenitic stainless steel weld joint through the method, and the standard of nondestructive detection can be achieved when effective ultrasonic detection is conducted on the weld joint; and certain reference significanceis achieved for detection of the industry in the field.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection of austenitic stainless steel butt welding joints, and in particular relates to an ultrasonic detection method of austenitic stainless steel butt welding joints. Background technique [0002] Austenitic stainless steel welds have coarse grains, columnar grains and anisotropy, which strongly absorb and scatter ultrasonic waves, resulting in large loss of sound energy, many grass-like echoes, and large deviations in defect quantitative positioning, which seriously affect the determination and accuracy of defects. Repair. [0003] With the application of austenitic stainless steel in the petrochemical, pharmaceutical, and aerospace fields more and more widely, in order to be able to realize ultrasonic testing in austenitic stainless steel welds, it is necessary to take special technical measures and carry out experimental verification. However, there are few methods to detect weld defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/11
CPCG01N29/11G01N2291/0289G01N2291/2675Y02E30/30
Inventor 孙树楠严恒静纪禄
Owner CHINA NAT CHEM ENG THIRD CONSTR
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