Method of submerged arc welding high tensile strength steel having trace elements of vanadium or niobium

Claim 2

In a method of submerged arc welding of high tensile strength steel containing trace amounts of vanadium or niobium, the improvement comprising using a steel welding wire and a flux consisting of a non-metallic powder and a metallic powder, said steel wire comprising 0.2-2.5 percent Manganese, 0.002-0.05 percent Boron and at least one additive metal selected from the group consisting of Titanium, Aluminum and Zirconium, wherein the total quantity of the additive metal is from 0.005-0.5 percent, said metal powder portion of said flux comprising 5-75% Iron powder less than 5% Si less than 10% Mn wherein more than 80% of the powder grains are smaller than 20 mesh in size, and said non-metallic powder portion of said flux comprises 15-60 percent MgO, and at least one material selected from the group consisting of carbonate and oxalate in an amount of from 3-40 percent, and the balance being a slag producing agent, wherein the basicity of the flux expressed in terms of the ratio of basic oxide content to the acid oxide content is above 1.0, and wherein the particle size of more than 70 percent of the entire flux is smaller than 8 mesh.