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Abstract
This article deals with temperature characterisation by infrared thermography during welding. To demonstrate the versatility of this technique, two welding processes were investigated with different materials: cold metal transfer metal inert gas welding of al alloy and resistance spot welding of galvanised steel. Two experimental methods were used to characterise temperature without requiring implementation of thermocouples. The validity of these methods is demonstrated by metallurgical characterisations. The error on the measured values of temperature is assessed regarding the initial uncertainty on the apparent surface emissivity. The results show that it is possible to obtain absolute temperature values, cooling rates and informative visualisation of temperature gradients with a reasonable uncertainty.
Parts of this study were supported by the ArcelorMittal R&D company and the French National Agency for Research and Technology. Authors sincerely thank Dr R. Danjoux (FLIR Systems, Inc.) and Pr Y. Scudeller for their help in performing the thermal analysis. F. Guillou and D. Lafon are also acknowledged for their valuable technical help.
