Machines. Technologies. Materials.
Vol. 19 (2025), Issue 1, pg(s) 33-37

TECHNOLOGIES

Methods of Temperature Measurement in Heat Affected Zone during Welding

  • 1 Institute of Metal Science, Equipment, and Technologies with Center for Hydro- and Aerodynamics ―Acad. A. Balevski, Sofia, Bulgaria,

Abstract

The metal materials are subject to severe temperature variation during the application of the welding process. The heat input and thermal shock during arc welding cause change of the base material properties in the heat affected zone. Temperature measurements and destructive tests of sample pieces, subjected to different process parameters and conditions, enable identification of minimum and maximum cooling rates, at which the material properties remain in pre-defined limits. Temperature measurements on the surface of the material in proximity to the weld seam enables cooling rate monitoring and material properties evaluation at manufacturing or site installation conditions, when the products could not be subjected to destructive tests. The requirements to the surface temperature measurement during welding and the characteristics of the different measuring devices were investigated for fitness to the purpose of cooling rate calculations, material properties evaluation, as well as for calibration of welding process simulations in volumes in close proximity to the arc welding seams.

Keywords

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