Research regarding the influence of the preheating temperature on the welding dilution

Abstract

Due to high costs generated by the replacement of certain products components, currently, specialists in the field seek for solutions to develop some technologies dedicated to recondition the affected areas. In industry, there are many applications where the component that comes in touch with the operating environment must be made out of different characteristics material layers – one designated to resist corrosive conditions and the other to increase the resistance. These components are usually the result of depositing appropriate layers by welding. The paper presents the results obtained during the experiments carried out in order to establish the influence of the preheating temperature on the dilution resulted from metal active gas welding deposit (GMAW). A number of experiments are carried out by using different preheating temperatures, keeping constant the welding deposit parameters: deposit speed (vd), welding current (Is) and arc voltage (Ua). The results are presented in tabular form, macroscopic or graphic images through which can be set quantitatively and qualitatively, valid for the experimental conditions, the effects of the pre-heating temperature on the dilution but also on other geometric parameters of the weld bead such as the width of the weld bead, the penetration, the reinforcement or the final crater.