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thermography at welding applications.. thermoimagen 2/12/2004
do anybody have some info about this topic?
where i can read something about?..

regards
 
Re:thermography at welding applications.. Gary Orlove 2/12/2004
INFRARED THERMOGRAPHY IN MONITORING OF LASER WELDING
B. Grabas Center for Laser
Technologies of Metals Kielce University of Technology and the Polish Academy ...
See http://lapromat.ippt.gov.pl/Cedzyna/Grabas/prezentacja.pdf

Intelligent Welding Using NDE Sensors
Welding today is an inseparable part of industries, plants and components. Present day welding science and technology has laid emphasis on the development of intelligent welding systems and processes. Intelligent welding (IW), combines welding equipment with intelligent sensing and control through smart sensors, knowledge of human experts, and artificial intelligence.. This technology if effectively implemented results in products with improved quality, reduced scatter in properties and cuts down in energy requirements. Different control methods such as use of dynamic circuit resistance, have been used to achieve good weld quality. The latest trend in IW involves the use of nondestructive evaluation (NDE) sensors. In this paper, the authors establish the feasibility on the use of thermal imaging and acoustic emission for monitoring resistance spot welding and end cap welding. While both these techniques give information about the inhomogeneities within a material, they are complementary to each other. The AE signals generated during spot welding and end capwelding were recorded using PZT transducers having resonant frequency of 175 kHz and 150 kHz respectively. Thermal images were captured using the Thermovision 870 scanner and recordedon a modified video thermal recorder.
See http://www.ndt.net/abstract/ecndt98/193.htm

The temperature of the samples during the welding process is also of interest, as temperature affects the micro structure of the metal and therefore its properties.

Temperature data can be taken directly, using thermocouples, or indirectly with an infrared camera. In our experiments we will use both methods and compare the results to determine which is the most accurate and efficient method of recording temperature data.
See http://www.tufts.edu/as/tampl/summer2000/projects/welding/plasmaweld.htm

ADVANCES IN NON-DESTRUCTIVE INSPECTION AND EVALUATION OF WELDS
Also use of acoustic emission and infrared thermography methods for on-line monitoring and control of welding processes and for integrity assessment of welded pressure vessels are discussed. The techniques used for evaluation of residual stresses in welded components are also covered.
See http://www.geocities.com/raobpc/Welding.html

MELTING FRONT MAPPING BY SIMULTANEOUS THERMOGRAPHY IN THE INFRARED AND IN THE ULTRAVIOLET
http://www.univ-reims.fr/Labos/LEO/Qirt_2000/docs/3-9HerveFRANCOU.htm

You will also find many papers on this application at SPIE
See http://spie.org/app/Publications/

Gary Orlove
Infrared Training Center
 
Re:thermography at welding applications.. thermoimagen 2/13/2004
thanks gary ..
 


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