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Phased array detection method for austenite stainless steel pipeline butt weld joint

A technology for austenitic stainless steel and butt welds, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, measuring devices, and material analysis using sound waves/ultrasonic waves/infrasonic waves. It can solve high risks, long construction periods, and inconsistent sensitivity and other issues to achieve the effect of improving accuracy, reducing detection cost and improving work efficiency

Inactive Publication Date: 2019-09-20
YANGJIANG NUCLEAR POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a phased array detection method for butt welds of austenitic stainless steel pipes by simulating detection tests and redesigning sensitivity comparison test blocks, which solves the problem of long construction period for radiographic detection of stainless steel welds. , the problem of high risk, and solves the problem of distortion of the sound beam propagation path caused by the inconsistency of sensitivity in the process of phased array detection of austenitic stainless steel pipe butt welds

Method used

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  • Phased array detection method for austenite stainless steel pipeline butt weld joint
  • Phased array detection method for austenite stainless steel pipeline butt weld joint
  • Phased array detection method for austenite stainless steel pipeline butt weld joint

Examples

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Effect test

Embodiment 1

[0077] The butt weld of austenitic stainless steel pipes with a specification of Φ28x4mm is selected as the simulation verification test block. There are a total of 3 pipes, the material is 316L, and a certain number of defects are embedded in them, including cracks, incomplete fusion, incomplete penetration, air holes, strips, etc. There are five types of defects, including all defects that may occur during the welding process, and the detection surface is treated: the smoothness of the scanning surface of the probe movement does not exceed 12.5um, so that the probe is completely coupled and can move freely; for the weld surface, Irregular reinforcement is removed, and the transition with the base material is smooth; the couplant is a special couplant for stainless steel, and the halogen content is strictly controlled.

[0078]Choose GEKKO equipment as the phased array detector, and select 7.5S16-0.5*10 self-focusing probe, 5S16-0.5*10 self-focusing probe, 5DL16A25 (double Li...

Embodiment 2

[0083] After the successful process verification of the simulated verification test block through Example 1, the butt weld of the austenitic stainless steel pipe used in the actual nuclear power plant is detected. The detection range is the weld seam and the area of ​​13mm on both sides of the weld seam. Treatment of the detection surface: the smoothness of the scanning surface of the probe movement does not exceed 12.5um, so that the probe is completely coupled and can move freely; for the weld surface, the irregular reinforcement is removed to make a smooth transition with the base metal; the coupling agent is stainless steel Special couplant, strict control of halogen content.

[0084] Because the diameter of the austenitic stainless steel pipe butt weld to be tested is 25-500mm, and the wall thickness is 3.5mm-10mm, according to the process verified in Example 1, GEKKO equipment is selected as the phased array detector, and 7.5S16-0.5*10 is selected. Self-focusing probe, ...

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Abstract

The invention discloses a phased array detection method for an austenite stainless steel pipeline butt weld joint. With the phased array detection method adopted, the defects of the austenite stainless steel pipeline butt weld joint can be recorded; the defect detection rate of the austenite stainless steel pipeline butt weld joint is high; detection is safe; and cost is low. According to the technical schemes of the invention, the method comprises the following steps that: pre-detection preparation work is performed for a workpiece to be detected, and a detection instrument is installed; a sample model is established according to the groove form and detection thickness of the weld joint, detection equipment parameters are set; a sensitivity comparison test block is selected, and a sensitivity reference curve is drawn; a simulation verification test block is produced, detection sensitivity is set, and the defect of the simulation verification test block is detected, and whether a detection process is effective or not is verified; single-side double-side detection is performed on any surface of the weld joint according to the verified detection process, and detection data are recorded; and defects existing in the detection data are analyzed.

Description

technical field [0001] The invention relates to the field of nondestructive testing, in particular to a phased array testing method for butt welds of austenitic stainless steel pipelines. Background technique [0002] The butt welds of the stainless steel pipes of nuclear power conventional islands are designed according to the design requirements, and 100% radiographic flaw detection is required for the welds after welding. Radiographic inspection technology has been used in the industry for more than 100 years. The negative film can intuitively reflect the final quality inside the weld, and can be permanently preserved as a product quality certification document. [0003] According to feedback from previous overhauls, there are risks such as mid-task, high safety risks, tight planning windows, and easy accidental exposure of personnel in all radiographic inspection projects. For the radiographic inspection of conventional islands, there are still problems such as large is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/30
CPCG01N29/041G01N29/30G01N2291/0234
Inventor 刘恩凯张大勇施建辉丁清越方磊畅璐璐许星星王进王勤
Owner YANGJIANG NUCLEAR POWER
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