Detecting Cold Weld Defects in HDPE Piping Thermal Fusion Welds Based on Microwave Technique

2013 ◽  
Vol 423-426 ◽  
pp. 852-856
Author(s):  
Jin Ping Pan ◽  
Xin Wei Zhu ◽  
Lian Jiang Tan
Keyword(s):  
High Density Polyethylene ◽  
Heating Time ◽  
Testing System ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Microwave Technique ◽  
Weld Defects ◽  
Fusion Weld ◽  
Non Destructive ◽  
Fusion Welds

In the present paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipelines based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds containing cold weld defects caused by insufficient heating time were examined by frequency sweep within the range of 9.2-9.9 GHz. At the frequencies that were most sensitive to the cold weld defects, the measured reflection coefficient S11 showed greatly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make the detection of the cold weld defects possible and feasible. This work provides insights for non-destructive testing of technical defects in HDPE piping welds.

Experimental Study on Microwave Test of Cold Weld Defects in HDPE Piping Thermal Fusion Welds

2013 ◽  
Vol 433-435 ◽  
pp. 895-899
Author(s):  
Jin Ping Pan ◽  
Xin Wei Zhu ◽  
Lian Jiang Tan
Keyword(s):  
Experimental Study ◽  
Reflection Coefficient ◽  
High Density Polyethylene ◽  
Testing System ◽  
Proper Position ◽  
Frequency Sweep ◽  
Microwave Technique ◽  
Weld Defects ◽  
Fusion Weld ◽  
Fusion Welds

In this paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipeline based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds were examined in a proper position by frequency sweep within the range of 9.3-9.9 GHz. At a frequency that was most sensitive to the cold weld defects, the measured reflection coefficient S11 exhibited significantly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make identification of the cold weld defects possible. This work provides a basis for inspection of defects in HDPE piping welds.

Non-Destructive Detection of GIS Aluminum Alloy Shell Weld Based on Oblique Incidence Full Focus Method

2020 ◽  
Vol 1007 ◽  
pp. 105-110
Author(s):  
Xin Xin Wang ◽  
Cheng He ◽  
Pu Zhi Zhao ◽  
Yi Zheng ◽  
Shi Hao Jiang ◽  
...  
Keyword(s):  
Oblique Incidence ◽  
Near Field ◽  
Calibration Coefficient ◽  
Quantitative Detection ◽  
Imaging Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Field Range ◽  
Weld Defects ◽  
Non Destructive

In this paper, a new ultrasonic phased array full focus imaging method based on oblique incidence is proposed to solve the problem of the non-destructive testing of the internal defects in the GIS (gas insulated switchgear) shell welds. By using wedge coupling, the measured weld is far away from the near-field range of the transducer, and the detection angle range can be increased by changing the propagation direction of the acoustic beam. Based on Snell's law, the propagation characteristics of the ultrasonic wave in the interface are studied. On the basis of the conventional ultrasonic array matrix and the full focus imaging algorithm, by introducing the energy attenuation calibration coefficient of the acoustic wave propagation through the wedge, the correction amplitude of the specific focus point p(x, z) is obtained, The non-destructive testing of weld defects of GIS shell in the spot is carried out, and the test results show that the qualitative and quantitative detection of the weld defects can be well realized by using this method.

The Development of an Automatic Ultrasonic Non-Destructive Testing System

2014 ◽  
Vol 599-601 ◽  
pp. 1120-1123
Author(s):  
Xiang Ming Zheng ◽  
Jie Hu ◽  
Yao Sheng Chen
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Work Piece ◽  
Testing System ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Detection ◽  
Ultrasonic Probe ◽  
Data Acquisition Card ◽  
Non Destructive

The testing principle of metal ultrasonic is using ultrasonic probe to scan in the work-piece surface, and acquire the probe of reflection signal which is sent to computer to analysis by the ultrasonic data acquisition card so as to detect and locate defects in surface of the parts. This system designed a unique scanning structure using the principle of ultrasonic detection and scans the hardware and software control system to realize internal shape detection for different shape of work-piece.

Non-destructive Testing of Internal Defects in composite post insulators Using Microwave Technique

2021 ◽  
Author(s):  
Xiying Wang ◽  
Zhidong Cheng ◽  
Li Cheng ◽  
Lijun Yang ◽  
Ruijing Liao ◽  
...  
Keyword(s):  
Non Destructive Testing ◽  
Internal Defects ◽  
Destructive Testing ◽  
Microwave Technique ◽  
Non Destructive
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