Abstract: A flux cored wire for welding duplex stainless steel, comprising a shell cored with a flux. The wire is good in pitting corrosion resistance and notch toughness. In the wire, the total of the shell and the flux comprises Cr, Mo and N in an amount of 21.0-26.0 wt %, 2.6-4.0 wt % and 0.08-0.30 wt %, respectively, of the total weight of the wire; the amounts of C, Bi and a metal inclusion having a melting point over 2000° C. are set up to 0.04 wt % or less, 0.015 wt %, and 0.1 wt %, respectively; the total amount of Ni powder and Fe powder is set up to 3.0 wt %; and a parameter A represented by [Cr]+3.3×[Mo]+16×[N]−150×[Bi] wherein [Cr], [Mo], [N] and [Bi] represent the contents of Cr, Mo, N and Bi, respectively, is from 33.0 to 43.0.

Abstract: A flux-cored wire for welding stainless steel, with the flux filled in the metal skin, which contains 5-30% (by weight) of flux, 10.5-27.0% of Cr, less than 2% of slag-forming constituents, 0.05-2.0% of Ti, 0.05-2.0% of Si, 0.01-0.1% of N, 0.01-1.0% of Al, 0.1-1.0% of Mn, and 0.003-0.5% of metal fluorides constituting the flux, in the total weight of the wire. The wire may optionally contain Ni, alkali metals, S, Nb, Zr, and V. The wire gives rise to only a small amount of slag.