Defect Detection in Thick Weld Structure Using Welding In-Process Laser Ultrasonic Testing System

被引：25

作者：

Yamamoto, Setsu ^{[1
]}

Hoshi, Takeshi ^{[1
]}

Miura, Takahiro ^{[1
]}

Semboshi, Jun ^{[1
]}

Ochiai, Makoto ^{[1
]}

Fujita, Yoshihiro ^{[2
]}

Ogawa, Tsuyoshi ^{[2
]}

Asai, Satoru ^{[2
]}

机构：

[1] Toshiba Co Ltd, Power & Ind Syst Res & Dev Ctr, Yokohama, Kanagawa 2358523, Japan

[2] Toshiba Co Ltd, Keihin Prod Operat, Yokohama, Kanagawa 2300045, Japan

来源：

MATERIALS TRANSACTIONS | 2014年 / 55卷 / 07期

关键词：

lase ultrasonic testing; thick welding; welding in-process; synthesis aperture focus technique (SAFT); OPTICAL-DETECTION;

D O I：

10.2320/matertrans.I-M2014809

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new approach of non-destructive testing for thick welded structural materials based on laser-ultrasonic technique is investigated. In this study, weld part of structural materials, which should be conventionally inspected after welding, is inspected during welding process in order to save time and cost of manufacturing. The laser-ultrasonic is a method to generate and detect ultrasonic signals by laser beams and has potential to be applied to remote inspection/monitoring of materials under welding at elevated temperature. Bulk longitudinal acoustic wave generated by a Q-switched Nd:YAG laser irradiation and detected as surface vibration by laser interferometer coupled with a long pulse detection laser is used to detect defects around the weld. To overcome the lack of sensitivity of laser-ultrasonic testing on thick welded part having a thickness of more than 100 mm at higher temperature, we have originally developed a modified synthesis aperture focus signal processing technique (m-SAFT). The in-process testing with actual piping weld having a thickness of 150 mm with high temperature more than 200 degrees C. was demonstrated. By using m-SAFT, an actual weld defect of 1.5 nun in diameter at 106 mm depth in the specimen was clearly observed. The measurement result well agreed with the result of conventional ultrasonic testing conducted after weld process and also the cross-sectional observation of the specimen.

引用

页码：998 / 1002

页数：5

共 17 条

[1] Improved resolution and signal-to-noise ratio in laser-ultrasonics by SAFT processing [J].

Blouin, A ;

Levesque, D ;

Neron, C ;

Drolet, D ;

Monchalin, JP .

OPTICS EXPRESS, 1998, 2 (13) :531-539

[2]

Charlesworth J., 2001, ENG APPL ULTRASONIC, V2nd

[3] DEVELOPMENT OF A WELDING MONITORING SYSTEM FOR IN-PROCESS QUALITY CONTROL OF THICK WALLED PIPE [J].

Fujita, Y. ;

Ogawa, T. ;

Asai, S. ;

Yamamoto, S. ;

Ohdake, T. ;

Ochiai, M. .

WELDING IN THE WORLD, 2012, 56 (11-12) :15-25

[4] SPHERICAL MIRROR FABRY-PEROT INTERFEROMETER [J].

HERCHER, M .

APPLIED OPTICS, 1968, 7 (05) :951-&

[5]

Kinoshita M, 2012, Trans. Japan Soc. Mech. Eng. C., V78, P2824

[6]

Kitagawa A., 2003, J JAPAN WELD SOC, V72, P44

[7]

Levesque D., 2002, J ACOUST SOC AM, V112, P2350

[8] Time of flight diffraction method using laser ultrasound for noncontact flaw height measurement [J].

Mihara, T ;

Otsuka, Y ;

Cho, H ;

Yamanaka, K .

ADVANCES IN FRACTURE AND FAILURE PREVENTION, PTS 1 AND 2, 2004, 261-263 :987-992

[9] OPTICAL-DETECTION OF ULTRASOUND AT A DISTANCE USING A CONFOCAL FABRY-PEROT-INTERFEROMETER [J].

MONCHALIN, JP .

APPLIED PHYSICS LETTERS, 1985, 47 (01) :14-16

[10]

Monchalin JP, 2003, REV PROG Q, V20, P264, DOI 10.1063/1.1570146

← 1 2 →