Method for detecting type of FSW welding seam defect by using ultrasonic phased array

An ultrasonic phased array and friction stir welding technology, which is used in the analysis of solids, instruments, and materials by using sonic/ultrasonic/infrasonic waves. The effect of high detection efficiency and enhanced reliability

Inactive Publication Date: 2020-01-14
江西省锅炉压力容器检验检测研究院
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practical applications, due to the influence of welding process parameter deviation, clamping conditions, material surface conditions, operators and other factors, friction stir welding workpieces may also have defects, which will affect the performance of the joints, and friction stir welding defects are relatively more than conventional fusion welding defects. It has the characteristics of closeness, subtlety and complex orientation, which increases the difficulty of detection, affects its popularization and application to a certain extent, and also makes it of great practical significance for the efficiency, accuracy and convenience of its defect detection
At present, the non-destructive testing technologies for friction stir welding seam defects mainly include X-ray and ultrasonic testing. X-ray images are clear and can be stored for a long time, but the detection sensitivity is relatively low, while ultrasonic testing has strong applicability and high detection sensitivity, but At present, the ultrasonic testing research mainly focuses on the regular defects on the incident surface, and there is little research on the defect interface with variable curvature and variable orientation. In the FSW process, the plastic metal flow caused by the stirrin

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting type of FSW welding seam defect by using ultrasonic phased array
  • Method for detecting type of FSW welding seam defect by using ultrasonic phased array
  • Method for detecting type of FSW welding seam defect by using ultrasonic phased array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Three vertical non-penetration butt joint specimens of different lengths were prepared. The 2A14 aluminum alloy plate with a size of 200mm×150mm×8mm is used to make the butt weld. The material of the stirring head is H13 steel. The thread on the surface of the needle is a left-handed thread, the welding parameter selection speed is 950r / min, the welding speed is 75mm / min, and the inclination angle of the stirring head is 2°. The inclination angle of the butt joint surface of the test plate is processed by wire cutting and milling machine. In this embodiment, the inclination angle of 90° is selected as the vertical butt joint surface. The shape of the docking surface and the insertion position of the stirring needle are as follows: figure 1 shown.

[0033] In order to study the influence of different lengths of vertical non-penetration defects on the detection, the vertical butt joint test panels were welded with stirring heads with different lengths of left-handed thr...

Embodiment 2

[0036] Using the same material and FSW process as in Example 1, the plate was processed at an inclination angle of 45°, and the non-threaded stirring pin was used for FSW butt jointing to obtain a welding defect test plate. Since the inclination angle of the butt joint surface of the test plate and the length of the stirring tip change compared with that of Example 1, the incomplete penetration form of the butt weld will change. Due to the low plastic flow effect caused by the non-threaded stirring needle, the prepared incomplete penetration defect is a flat interface, so that the plastic metal on the retreating side is not enough to fill the instantaneous cavity on the advancing side during the welding process, while the welding on the advancing side (welding The direction is the same as the direction of rotation of the stirring head) tunnel holes appear (such as Figure 5 shown). At the same time, the same ultrasonic phased array as in Example 1 was used to conduct phased a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for detecting the type of an FSW (Friction Stir Welding) welding seam defect by using an ultrasonic phased array, and belongs to the technical field of nondestructive detection of a welding joint. The method is characterized by taking aluminum alloy as a raw material, obtaining butt welding seams by using FSW, for incomplete-penetration and tunnel hole defects in different shapes in the welding seam, detecting the shapes of the interfaces of the defects by means of the ultrasonic phased array, detailedly researching the characteristics of phased array sector scanning modes in different directions of the interfaces of the tunnel holes, and finally identifying the different shapes of the incomplete-penetration and tunnel hole defects by combining texture analysis. The method of the invention has the advantages that: (1) the detection is convenient and easy to operate; (2) The detection efficiency is high and the reliability is strong; in conclusion, the ultrasonic phased array technology has obvious advantages on FSW welding seam detection, is accurate in tunnel hole positioning, and has good detectable rate even if the orientation of a defect interface is complex in the aspect of detection of fine size defects.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of welded joints, and in particular relates to a detection method for ultrasonic phased array detection of friction stir welding seam defect types. Background technique [0002] Since the advent of Friction Stir Welding (FSW) technology in the early 1990s, it has been considered the most eye-catching welding method since laser welding. Its appearance has brought about a major change in the joining technology of non-ferrous metals such as aluminum alloys. Some high-strength aluminum alloy materials that were previously considered unweldable can basically be welded by friction stir welding. It is used in aerospace, ships, and high-speed railways. Numerous examples of successful applications have emerged in fields such as train manufacturing. [0003] In practical applications, due to the influence of welding process parameter deviation, clamping conditions, material surface conditio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/2675
Inventor 李成军杨秋萍林刚徐平华乐洪甜程欣程炜刘钺张量
Owner 江西省锅炉压力容器检验检测研究院
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap