ABSTRACT
The chapter deals with the identification of gaseous effluents resulting from the preparation of hybrid adhesive-laser joints. CrNiMo AISI 316 1-mm thick stainless steel was used as the base material (adherent), which was joined by four types of Loctite two-component epoxy adhesives: Hysol 9466, Hysol 9455, Hysol 9492, and Hysol 9497 with Trumpf D70 welding head. The chemical composition of the adhesives was realized by Fourier transform infrared spectroscopy analysis; the effect of elevated temperature was analyzed by simultaneous thermal analysis and thermogravimetric analysis. The simulation of the thermal decomposition of the adhesive due to the temperature cycle of welding was performed by pyrolysis. The gaseous products were analyzed by gas chromatography and mass spectrometry. In the thermal degradation process, the cyclic hydrocarbons, such as phenol, 230bisphenol, benzene, unofuran, and many others, are created. In terms of the number of individual degradation products, it can be stated that fewer products have been found in Hysol 9466 and Hysol 9497, whereas the largest number of volatile thermal decomposition products has been found in Hysol 9492. The identified gaseous products are hazardous to the human body, so it is necessary to ensure consistent exhaustion of the resulting fumes when making hybrid joints.
