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Abstract

On a method of welding a high nitrogen containing stainless steel using, as a base metal, a high nitrogen stainless steel containing nitrogen at or above a solubility equilibrated with N.sub.2 at 1 atm when melted, a novel welding method keeping a weld metal composition from supersaturation of N in a molten state, having a sufficient corrosion resistance in an average composition of the weld metal under sea water circumstance and capable of maintaining mechanical characteristics and corrosion resistance comparable with those of a base metal is provided, wherein welding is conducted while setting a composition of a welding material and a dilution rate to be defined latter so as to satisfy the following two relations (A) and (B): 1 % N p .times. D 0.028 .times. ( % Cr p .times. D + % Cr ' .times. ( 1 -D )) + 0.014 ( % Mo p .times. D + % Mo F .times. ( 1 - D )) - 0.0060 .times. ( % Ni P .times. D + % Ni c .times. ( 1 - D )) - 0.26 ( A ) ( % Cr P .times. D + % Cr P( 1 - D ) ) + 3 .times. ( % Mo .times. D + % Mo P .times. ( 1 -d )) + 8 .times. % N P .times. D38 ( B ) wherein the dilution rate D is defined as a ratio of a cross sectional area of a base metal melted portion to a cross sectional area of a weld metal on every one pass of welding, the concentration of Cr, Ni, Mo and N (on the weight basis) of the base metal are defined as %Cr.sup.P, %Ni.sup.P, %Mo.sup.P and %N.sup.P and concentrations (on the weight basis) of Cr, Ni and Mo of the weld material are defined as %Cr.sup.F, %Ni.sup.F and %Mo.sup.F.

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First Claim