Research on phased array ultrasonic technique for testing butt fusion joint in polyethylene pipe

2016 ◽  
Author(s):  
Wei-can Guo ◽  
Jian-feng Shi ◽  
Dong-sheng Hou
Keyword(s):  
Phased Array ◽  
Ultrasonic Technique ◽  
Polyethylene Pipe

Ultrasonic Phased Array Inspection With Water Wedge for Butt Fusion Joints of Polyethylene Pipe

2019 ◽  
Author(s):  
Cunjian Miao ◽  
Yinkang Qin ◽  
Weican Guo ◽  
Chengmin An ◽  
Zhangwei Ling ◽  
...  
Keyword(s):  
Phased Array ◽  
Incident Angle ◽  
Cooling Water ◽  
Specific Probe ◽  
Ultrasonic Technique ◽  
Polyethylene Pipe ◽  
Nondestructive Examination ◽  
Polyethylene Pipes ◽  
Ultrasonic Phased Array ◽  
Probe Holder

Abstract Polyethylene pipe has been used widely in gas transportation and nuclear safety-related cooling water applications due to its exceptional resistance to corrosion and erosion. Butt fusion joint is one of the main welding forms for polyethylene pipes. Ultrasonic technique is a typical nondestructive examination technique. To overcome the coupling problems when inspecting butt fusion structures, an inspection technique of ultrasonic phased array using water wedge is proposed to solve the coupling matching and to increase the ultrasound amplitudes. The influences on the imaging of the parameters (such as the angle and height of the water wedge), the array element specifications, and the aperture, were investigated via simulations. The parameter optimization was conducted to establish a suitable detection process. After that, the related probe and a simulated water wedge were designed based on the results and manufactured, in which the simulated wedge as a specific probe holder could adjust its own incident angle and array height. Meanwhile, a typical DN315 pipe of PE 100 was made with some typical artificial defects in it. Experiments were conducted, and the results showed that the proposed water-wedged ultrasonic phased array technique is suitable for butt fusion joint inspection.

Research on Phased Array Ultrasonic Technique for Testing Tube to Tube-Sheet Welds of Heat Exchanger

2016 ◽  
Author(s):  
Weican Guo ◽  
Shengjie Qian ◽  
Zhangwei Ling ◽  
Dongsheng Hou
Keyword(s):  
Heat Exchanger ◽  
Ultrasonic Testing ◽  
Phased Array ◽  
Incomplete Fusion ◽  
Testing System ◽  
Ultrasonic Frequency ◽  
Ultrasonic Technique ◽  
Tube Sheet ◽  
Element Size ◽  
Array Probe

The tube to tube-sheet weld is the main connection structure of heat exchanger. This paper presents the phased array ultrasonic technique for testing the tube to tube-sheet welds of heat exchanger. The optimization analysis of phased array parameters and the simulation on the acoustic field with CIVA software were completed. The mentioned phased array parameters included array elements, array element size, deflection angle, ultrasonic frequency and so on. An ultrasonic testing system was designed and fabricated in accordance with the structure of heat exchange tube and fillet welds position. The ultrasonic C-scan was carried out by the ultrasonic testing system with its circumferential scanning by a mechanical scanning device while the axial electronic linear scanning by the phased array probe. At last, tests on samples with the porosity and incomplete fusion flaws were performed by the ultrasonic testing system. Experimental results showed that the phased array ultrasonic technique could effectively detect the porosity flaws and the incomplete fusion flaws in the tube to tube-sheet welds of heat exchanger.

Evaluation of material degradation using phased array ultrasonic technique with full matrix capture

2021 ◽  
Vol 120 ◽  
pp. 105118
Author(s):  
Santhakumar Sampath ◽  
R. Dhayalan ◽  
Anish Kumar ◽  
N.N. Kishore ◽  
Hoon Sohn
Keyword(s):  
Phased Array ◽  
Ultrasonic Technique ◽  
Material Degradation ◽  
Full Matrix

Ultrasonic Technique for Testing Cold Welding of Butt-Fusion Joints in Polyethylene Pipe

2013 ◽  
Author(s):  
Weican Guo ◽  
Huiting Xu ◽  
Zhongqiang Liu ◽  
Jianfeng Shi
Keyword(s):  
Phased Array ◽  
Large Diameter ◽  
Test Methods ◽  
Heat Energy ◽  
Ultrasonic Technique ◽  
Cold Welding ◽  
Weak Point ◽  
Welding Joints ◽  
Solid Liquid Interface ◽  
Solid Liquid

The butt-fusion process is an important method for connecting PE pipes, especially when the pipes are of large diameter and of thicker section. Since many different environmental factors can cause defects and flaws, the joints become the weak point that should be inspected before the pipes begin service. Especially cold welding caused by insufficient input of heat energy, which can not be detected by nondestructive test methods currently available, is one of the most dangerous defects in the butt-fusion joints of PE pipes. It has been discovered that there are three Eigen-lines in the butt-fusion joint of PE pipes by using the phased array ultrasonic focusing technique. Further research shows that the upper and lower Eigen-line indicates the solid-liquid interface and the middle Eigen-line indicates the initial butt interface. Based on a lot of experiments, it has been discovered that the distance between the upper and lower Eigen-line, is related with the input of heat energy during welding. So a new method called “Eigen-line method” is developed to assess cold welding by measuring the distance between the upper and lower Eigen-line. A set of experiments show that the method can detect cold welding in butt-fusion joints with the accuracy less than 6%, which can meet the testing requirement for welding joints in engineering.

Availability study of a phased array ultrasonic technique

1984 ◽  
Vol 81 (2) ◽  
pp. 309-314 ◽  
Author(s):  
K. Uchida ◽  
S. Nagaii ◽  
H. Kashiwaya ◽  
M. Arii
Keyword(s):  
Phased Array ◽  
Ultrasonic Technique
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