Effects of Heat Input on the Pitting Resistance of Inconel 625 Welds by Overlay Welding

다국어 초록 (Multilingual Abstract)

The objective of this study was to establish the relationship between the dilution ratio of the weld zone and pittingresistance depending on the heat input to welding of the Inconel alloy. Each specimen was producedby electroslag welding using Inconel 625 as the filler metal. In the weld zone of each specimen, dendritegrains were observed near the fusion line and equiaxed grains were observed on the surface. It was also observedthat a melted zone with a high Fe content was formed around the fusion line, which became wider as thewelding heat input increased. In order to evaluate the pitting resistance, potentiodynamic polarization testsand CPT tests were conducted. The results of these tests confirmed that there is no difference between thepitting resistances of each specimen, as the structures of the surfaces were identical despite the effect ofthe differences in the welding heat input for each specimen and the minor dilution effect on the surface.

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