Effects of heat input on the pitting resistance of Inconel 625 welds by overlay welding

• DOI: 10.1007/s12540-015-4245-9
• Publication Date: 2015-03-11T07:18:52Z
• Authors: Jun Seok Kim; Young IL Park; Hae Woo Lee
• Keywords: Inconel 625; Inconel; Equiaxed crystals

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