CRACK SIZING ACCURACY OF A PHASED ARRAY ULTRASONIC SCANNER DEVELOPED FOR INSPECTION OF RIB-TO-DECK WELDED JOINTS IN ORTHOTROPIC STEEL DECKS

2018 ◽  
Vol 74 (3) ◽  
pp. 516-530
Author(s):  
Masafumi HATTORI ◽  
Tohru MAKITA ◽  
Kazuo TATEISHI ◽  
Takeshi HANJI ◽  
Masaru SHIMIZU ◽  
...  
Keyword(s):  
Welded Joints ◽  
Phased Array ◽  
Crack Sizing ◽  
Orthotropic Steel Decks ◽  
Ultrasonic Scanner

Investigation and Diagnosis of Fatigue Cracks of Rib-to-Deck Welded Joints in Orthotropic Decks by the Phased Array Ultrasonic Scanner

2019 ◽  
Author(s):  
Masafumi Hattori ◽  
Koji Osada ◽  
Shoji Nojima ◽  
Hideyuki Tatematsu
Keyword(s):  
Welded Joints ◽  
Phased Array ◽  
Early Stage ◽  
Fatigue Cracks ◽  
Transportation Safety ◽  
Investigation Area ◽  
Diagnosis Method ◽  
Ultrasonic Scanner ◽  
Pavement Damage ◽  
The Cost

<p>Over the last decade, fatigue cracks have been observed at the rib-to-deck welded joints in many orthotropic decks in Japan. Considering the fatigue cracks can cause pavement damage and thus compromise transportation safety, it is necessary to detect and repair it at the early stage of its development. But the cracks occur from the weld route, it cannot be detected in early stage by visual check. Therefore, the phased array ultrasonic scanner (PAUS) has been developed as the method which can detect and measure the cracks with small size. And, it can simultaneously investigates the deck propagation type cracks and the weld bead propagation type cracks.</p><p>In this study, we propose a diagnosis method which considered the relation with selected countermeasures based on technological knowledge. And we propose an investigation area selecting method based on investigation speed of the PAUS which is confirmed by trial on the real bridge. In addition, the cost advantage by using the PAUS is estimated.</p>

Fatigue process of rib-to-deck welded joints of orthotropic steel decks

2019 ◽  
Vol 101 ◽  
pp. 113-126 ◽  
Author(s):  
Benjin Wang ◽  
Wim Nagy ◽  
Hans De Backer ◽  
Airong Chen
Keyword(s):  
Welded Joints ◽  
Fatigue Process ◽  
Orthotropic Steel Decks

Application of Visual Beam Ultrasonic Phased Array in Inspection of Weld in Tubular Node

2015 ◽  
Author(s):  
Shaojun Wang ◽  
Xiaoying Tang ◽  
Houde Yu ◽  
Yaozhou Qian ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Welded Joints ◽  
Phased Array ◽  
Sound Beam ◽  
Ultrasonic Sound ◽  
Array Technology ◽  
Coverage Model ◽  
Ultrasonic Phased Array ◽  
Arbitrary Section ◽  
Tubular Joint ◽  
Low Efficiency

Responding to complexity and particularity welding on the geometry of TKY tubular node, this paper constructs mathematical model of tubular joint weld of arbitrary section by simplifying the geometry structure, and draws welded joints and ultrasonic sound beam lines based on the actual specifications in order to solve the problems of low efficiency, positioning difficulty, missing inspection and etc. The computeraided simulation technology can realize the visualization in the beam coverage model of welded joints, which can commendably guide the design of ultrasonic phased array inspection and overcome the blindness of the instrument detection parameters, thus improving the effectiveness and pertinence of the actual detection. Study shows that it is beneficial to enhance the effectiveness of the detection tubular joint weld by employment of Visual beam and ultrasonic phased array technology.

The Aberdeen phased array: a real-time ultrasonic scanner with dynamic focus

1980 ◽  
Vol 18 (3) ◽  
pp. 335-343 ◽  
Author(s):  
R. D. Selbie ◽  
J. M. S. Hutchison ◽  
J. R. Mallard
Keyword(s):  
Real Time ◽  
Phased Array ◽  
Ultrasonic Scanner

On-Line Detection of Friction Stir Welded Joints by High Temperature Phased Array Ultrasonic Inspection and Control of Weld Process Parameters

2017 ◽  
Author(s):  
Daniel Huggett ◽  
Muhammad Wahab ◽  
T. W. Liao ◽  
Ayman Okeil
Keyword(s):  
High Temperature ◽  
Process Parameters ◽  
Welded Joints ◽  
Phased Array ◽  
Welding Process ◽  
Inspection System ◽  
Friction Stir ◽  
On Line ◽  
And Control ◽  
Welding Processes

Non-Destructive Evaluation (NDE) of welded structures is essential in industry and manufacturing sectors. However, NDE techniques are limited when applied at high temperatures, which prevents usefulness for on-line real time inspection of welded joints. In this work, a high temperature (HT) inspection system was created utilizing Phased Array Ultrasonic Testing (PAUT), and tested on Friction Stir (FS) welded aluminum alloy joints. The system created in this work proves HT-PAUT is capable of determining defects during the welding process. Supplementing this work, a custom defect detection software was created to analyze S-Scan data to interpret when and where a defect occurs to provide defect indicator signals. These defect signals can be utilized for controlling the FSW process parameters to automatically correct if a defect is observed. The technology developed can be utilized as a platform for future automated welding processes and control for creating the next generation weld-NDE systems.

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

2020 ◽  
pp. 136943322096175
Author(s):  
Yang Liu ◽  
Fanghuai Chen ◽  
Da Wang ◽  
Naiwei Lu
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Growth ◽  
Welded Joints ◽  
Mixed Mode ◽  
Fatigue Cracks ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior ◽  
Orthotropic Steel Decks

Innovative double-sided welding is expected to improve the fatigue resistance of rib-to-deck welded joints of orthotropic steel decks (OSDs). Welding crack-like defects are the crucial issue affecting the fatigue performance of rib-to-deck double-sided welded joints. This study presents a numerical simulation of three-dimensional (3D) mixed mode fatigue crack growth behavior of rib-to-deck double-sided welded joints of OSDs. Maximum tensile stress theory and equivalent stress intensity factor (SIF) were used to simulate mixed mode fatigue cracks growth. The Paris law model was employed to predict the fatigue life. Fatigue cracks of rib-to-deck double-sided welded joints were characterized by the presence of mixed mode cracks of modes I (open), mode II (shear), and mode III (tear), which was dominated by mode I. The equivalent SIF was found to be complex at the growth stage with the maximum value at the two ends of the crack front and the minimum value at the midpoint of the crack front. The crack shape became flatter in the later phase of the crack growth. The fatigue crack surface underwent deflections during crack growth, making the final crack shape exhibiting the characteristic of a spatial curved surface. The initial crack geometry showed a significant impact on the fatigue life.

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