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Phased array detection and evaluation method for austenitic stainless steel small-diameter pipe welding joint

A technology of austenitic stainless steel and welded joints, which is used in measuring devices, processing response signals of detection, and analyzing solids using sonic/ultrasonic/infrasonic waves, which can solve problems such as analysis of defect patterns in scanning device design

Pending Publication Date: 2020-08-14
SHANDONG MECHANICAL ENG TESTING CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a phased array detection and evaluation method for austenitic stainless steel small-diameter pipe welded joints for the defects of the existing technology, and to solve the relevant test block production and detection parameters in the phased array ultrasonic detection process Key technical problems such as setting, defect detection capability confirmation, scanning device design, and defect map analysis

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  • Phased array detection and evaluation method for austenitic stainless steel small-diameter pipe welding joint
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  • Phased array detection and evaluation method for austenitic stainless steel small-diameter pipe welding joint

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Embodiment Construction

[0083] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0084] Embodiment The phased array detection is carried out on the welded joint of austenitic stainless steel small-diameter pipe with a specification of Φ76×10 and a material of TP310H.

[0085] figure 1 Shown is the phased array detection flow chart of the welded joint of austenitic stainless steel small-diameter pipe according to the present invention.

[0086] P1. Make a R50 semicircle calibration test block made of TP310H, the thickness of the test block is 30mm, such as Figure 8 shown;

[0087] P2. Make Type II comparison test block. The material and welding process of the welded joint in the middle of the comparison test block are the same as those of the workpiece to be inspected. The external dimensions of the test block are as follows: Figure 10a , Figure 10b As shown (when the wall thickness of the austenitic stainless steel smal...

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Abstract

The invention discloses a phased array detection and evaluation method for an austenitic stainless steel small-diameter pipe welding joint. The method comprises the steps of manufacturing a calibration test block; manufacturing a reference test block and a defect simulation test block; sectioning the defect simulation test block along the central axis, and carrying out metallographic structure analysis; establishing an anisotropic model, and determining an optimal acoustic beam incident angle; connecting a phased array instrument; carrying out sound velocity calibration and angle gain correction; establishing a welding joint model, and setting detection parameters; setting the detection sensitivity; verifying a detection process; assembling a scanning device; determining a detection area and carrying out surface treatment; applying a coupling agent, and scanning along the line; and conducting data analysis and evaluation. According to the method, the detection efficiency and precisionare improved, the detection quality of the austenitic stainless steel small-diameter pipe welding joint is guaranteed, and the radioactive source management risk and the detection cost are effectivelyreduced.

Description

technical field [0001] The invention relates to a method for detecting and evaluating welded joints of small-diameter pipes based on phased array ultrasonic testing technology, which is suitable for phased array testing of welded joints of pipes made of anisotropic materials such as austenitic stainless steel, and belongs to ultrasonic nondestructive testing and evaluation technology field. Background technique [0002] Austenitic stainless steel has the characteristics of high temperature resistance and corrosion resistance, shows good performance, and has excellent process performance, so it is widely used in high temperature and high pressure piping systems of thermal power generating units. Taking a one-million-kilowatt thermal power generation unit as an example, there are about 10,000 stainless steel small-diameter pipe welded joints in the boiler heating surface installation project alone, and the number occupies a considerable proportion. In addition, stainless stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/30G01N29/44
CPCG01N29/04G01N29/30G01N29/4418G01N29/4463G01N29/4445Y02E30/30
Inventor 齐高君孙望军徐学堃丁成海
Owner SHANDONG MECHANICAL ENG TESTING CO LTD
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