Ultrasonic sensing of GMAW: Laser/EMAT defect detection system. [Gas Metal Arc Welding (GMAW), Electromagnetic acoustic transducer (EMAT)]

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7237450

Carlson, N M; Johnson, J A; Larsen, E D ^[1]; Van Clark, A Jr; Schaps, S R; Fortunko, C M ^[2]

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1. EG and G Idaho, Inc., Idaho Falls, ID (United States)
2. National Inst. of Standards and Technology, Boulder, CO (United States)

In-process ultrasonic sensing of welding allows detection of weld defects in real time. A noncontacting ultrasonic system is being developed to operate in a production environment. The principal components are a pulsed laser for ultrasound generation and an electromagnetic acoustic transducer (EMAT) for ultrasound reception. A PC-based data acquisition system determines the quality of the weld on a pass-by-pass basis. The laser/EMAT system interrogates the area in the weld volume where defects are most likely to occur. This area of interest is identified by computer calculations on a pass-by-pass basis using weld planning information provided by the off-line programmer. The absence of a signal above the threshold level in the computer-calculated time interval indicates a disruption of the sound path by a defect. The ultrasonic sensor system then provides an input signal to the weld controller about the defect condition. 8 refs.

• Research Organization: EG and G Idaho, Inc., Idaho Falls, ID (United States)
• Sponsoring Organization: USDOD; Department of Defense, Washington, DC (United States)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 7237450
• Report Number(s): EGG-M-92287; CONF-9206173-8; ON: DE92017916
• Resource Relation: Conference: 3. international conference on trends in welding research, Gatlinburg, TN (United States), 1-5 Jun 1992
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
36 MATERIALS SCIENCE
DEFECTS
DETECTION
GAS METAL-ARC WELDING
MONITORING
COMPUTERIZED CONTROL SYSTEMS
DATA ACQUISITION SYSTEMS
FEEDBACK
NONDESTRUCTIVE ANALYSIS
PERSONAL COMPUTERS
TRANSDUCERS
ULTRASONOGRAPHY
WELDED JOINTS
ARC WELDING
CHEMICAL ANALYSIS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
FABRICATION
JOINING
JOINTS
MICROCOMPUTERS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
WELDING
420200* - Engineering- Facilities
Equipment
& Techniques
360101 - Metals & Alloys- Preparation & Fabrication