Ultrasonic sensing of GMAW: Laser/EMAT defect detection system
- EG and G Idaho, Inc., Idaho Falls, ID (United States)
- 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:
- Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 10164944
- Report Number(s):
- EGG-M--92287; CONF-9206173--8; ON: DE92017916
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101
42 ENGINEERING
420200
COMPUTERIZED CONTROL SYSTEMS
DATA ACQUISITION SYSTEMS
DEFECTS
DETECTION
FACILITIES, EQUIPMENT, AND TECHNIQUES
FEEDBACK
GAS METAL-ARC WELDING
MONITORING
NONDESTRUCTIVE ANALYSIS
PERSONAL COMPUTERS
PREPARATION AND FABRICATION
TRANSDUCERS
ULTRASONOGRAPHY
WELDED JOINTS