S-Scan of Ultrasonic Phased Array Testing for Electrofusion Joints of Polyethylene Pipes

2011 ◽  
Vol 284-286 ◽  
pp. 1823-1826 ◽  
Author(s):  
Yang Fu ◽  
Kai Ming Lin ◽  
Hui Huang ◽  
Wei Feng Zhang
Keyword(s):  
Distribution System ◽  
Phased Array ◽  
Gas Distribution ◽  
Polyethylene Pipes ◽  
Calibration Block ◽  
Examination Time ◽  
Ultrasonic Phased Array ◽  
Transducer Calibration ◽  
Array Testing

Electrofusion joint is used widely for PE pipes; the quality of the joint influences the safety of gas distribution system. Proven and reliable NDT technology of the joint is immature. The attenuation of ultrasound in PE is higher than for metals. Defects Include voids, cracks, bad fusion interfaces, dislocations of heating wires, could find be ultrasonic phased array testing. Examination time, surface of specimen, transducer, calibration block, resolution, examination range and couplant are recommend.

Classification of Defects in Fusion Joints of Polyethylene Pipes

2010 ◽  
Author(s):  
Jinyang Zheng ◽  
Yongquan Qin ◽  
Jianfeng Shi ◽  
Weican Guo ◽  
Hui Wang ◽  
...  
Keyword(s):  
Phased Array ◽  
Classification Method ◽  
Cold Welding ◽  
Naked Eye ◽  
Lack Of Fusion ◽  
Polyethylene Pipes ◽  
Ultrasonic Phased Array ◽  
Pipe Joints ◽  
Comprehensive Classification

To establish a comprehensive classification method of the defects in fusion joints of polyethylene (PE) pipes, the geometrical characters of typical defects in electrofusion (EF) and butt fusion (BF) joints were researched by means of ultrasonic phased array inspection and naked-eye observation. Then the results were comparatively analyzed, and a novel classification method of the defects in PE pipe joints was proposed. Typical defects in EF joints were classified as lack of fusion, voids, wire dislocation, and cold welding. And those in BF joints were classified as crack, voids, inclusion on fusion interface, and process defects. Furthermore, characteristics of the classified defects, together with their main causes were briefly described.

Development of an Ultrasonic Phased Array Testing System That Can Evaluate Quality of Weld Seam of High-Quality ERW Pipes

2012 ◽  
Author(s):  
Yutaka Matsui ◽  
Yukinori Iizuka ◽  
Masahito Suzuki ◽  
Eiichi Urahata ◽  
Tomohiro Inoue ◽  
...  
Keyword(s):  
Ultrasonic Testing ◽  
Phased Array ◽  
Weld Seam ◽  
Testing System ◽  
Beam Size ◽  
High Quality ◽  
Ultrasonic Phased Array ◽  
Weld Seams ◽  
Focused Beam

A high sensitivity ultrasonic testing system for inspection of the weld seam of ERW pipes was developed. The factors that affect the quality of the weld seam were investigated using an ultrasonic C-scan method with a focused probe and samples sliced from weld seams. As the result, it was found that a scattered-type penetrator consisting of micro oxides is a key factor in the quality of the weld seam. Absorbed energy in the Charpy impact test can be evaluated by the ultrasonic echo amplitude with the optimized focused beam size (about 1mm2) to detect the scattered-type penetrator. In order to evaluate the density of the scattered-type penetrator in weld seams with the optimum focused beam size for pipe, a point focused beam tandem method was developed by applying the ultrasonic phased array technique. The sensitivity of the developed method is 20dB higher for a standard artificial through drilled hole whose diameter is 1.6mm. A precise seam tracking system was also developed for application of the point focused beam tandem method to the actual ERW pipe manufacturing process. Since the allowance for applying the focused beam to the weld seam is very narrow, i.e., about 1mm, a circumference multi-point simultaneous receiving technique and thermal image-type seam detection technique were developed. The developed ultrasonic testing system has been in operation at the 24″ ERW mill at East Japan Works (Keihin District) of JFE Steel Corporation since March 2011. The combination of the ultrasonic testing system and an oxide control technique now contributes to production of high-performance, high-quality ERW pipe “Mighty Seam®” for use in frigid environments.

DGS curve evaluation applied to ultrasonic phased array testing

2010 ◽  
Vol 52 (4) ◽  
pp. 192-194 ◽  
Author(s):  
M Certo ◽  
G Nardoni ◽  
P Nardoni ◽  
M Feroldi ◽  
D Nardoni
Keyword(s):  
Phased Array ◽  
Ultrasonic Phased Array ◽  
Array Testing
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