Thermal control by artificial vision during hf soldering of metallic tubes

Eric Renier; P. Suzeau; Frederic Truchetet

doi:10.1117/12.275181

25 April 1997 Thermal control by artificial vision during hf soldering of metallic tubes

Eric Renier, P. Suzeau, Frederic Truchetet

Proceedings Volume 3019, Solid State Sensor Arrays: Development and Applications; (1997) https://doi.org/10.1117/12.275181
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

Many welding processes have been successively developed, used, and then left aside in favor of more recent ones. The current processes are welding by induction, at high or medium frequency, and welding by conduction. The procedure used during the application described herein is the high frequency soldering by induction which allows high production speed, contactless heating, and regularity and good quality of the weld, and therefore a significant advantage: the economy of electrical energy. The speed limit of the soldering is principally imposed by a good drive of the metal sheet in the profiling machine. Presently, the regulation or control parameters measured during the process are, either the voltage at the output of the H.F. power generator or the temperature measured with a bicolor pyrometer situated above the melted borders. The use of temperature as the control parameters, allows to stabilize faster the process. We propose herein a new method and approach which consists in controlling the temperature during the process with a thermal image acquisition system. Our system is composed of a CCD sensor, an acquisition card, an association of optic filters in order to capture some thermographic images. Then, applying and developing some low and high level image processings, we extract some spatial and thermal parameters which allow us to control in real time and with a low cost the welding process.

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Eric Renier, P. Suzeau, and Frederic Truchetet "Thermal control by artificial vision during hf soldering of metallic tubes", Proc. SPIE 3019, Solid State Sensor Arrays: Development and Applications, (25 April 1997); https://doi.org/10.1117/12.275181

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KEYWORDS

Image processing

Metals

Thermography

Machine vision

Optical filters

Spatial resolution

CCD image sensors

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