Filler for cored wire and flux cored wire for overlay welding with low dilution rate

摘要

The present invention is made of a composition comprising an alloy powder and a flux, wherein the weight ratio of the alloy powder for the flux is 25: 1 to 700: 1 and, SiO the flux is based on the total weight of the flux ₂ 60 ~ 85%, Al ₂ O ₃ 1 to 15% MgO 1 ~ and comprises a 35% provides a cored wire for the filling material, characterized in. When an overlay welding with flux cored wire filler is filled in accordance with the present invention, because the dilution and the dilution rate of variation of the weld to minimize the variation range of the mass ratio between the low state and the initial state of the alloy powder, such as welding and the organic phase transformation strain tolerance of the alloy composition (tolerance) may be possible to use a very small alloy to improve the reliability of the welding quality. In the case of the overlay welding flux cored wire in this undercut, meandering beads, such as pore generation is suppressed can be maintained to improve the bead shape of the weld, it is possible to prevent the welding defect due to deterioration of the welding surface to crack . ;