Simulace tepelně ovlivněné oblasti při svařování kolejnic pomocí SICO testu

Abstract

This thesis deals with physical simulation of progression of heat-affected zone using modified SICO formability test as a simulation of the thermal-deformation cycle, trying to extend application options of test on Gleeble simulator and approach the operating conditions of HAZ at the upset welding process with 136 RE class IH rail. At the welding plant there was implemented experimental welding of three rail fuses from which technological parameters were recorded. These were used as input data to program the waveforms for the Gleeble. With a pre-selected temperature cycle with 20-heatings during cooling, two-mode deformation welding simulations were performed on 32 samples that differed from each other in the cross-sectional area of the rail. The modified SICO test has proven to manage HAZ simulation at upset welding process. Based on the metallographic analysis, it has not been proven that the chemical composition or temperature-deformation regime affects the brittle areas, but the normative way of distributing segregations in individual rails.