A multi-strand composite welding wire was applied to join high nitrogen austenitic\nstainless steel, and microstructures and mechanical properties were investigated. The electrical\nsignals demonstrate that the welding process using a multi-strand composite welding wire is highly\nstable. The welded joints are composed of columnar austenite and dendritic ferrite and welded\njoints obtained under high heat input and cooling rate have a noticeable coarse-grained heat-affected\nzone and larger columnar austenite in weld seam. Compared with welded joints obtained under the\nhigh heat input and cooling rate, welded joints have the higher fractions of deformed grains, high\nangle grain boundaries, Schmid factor, and lower dislocation density under the low heat input and\ncooling rate, which indicate a lower tensile strength and higher yield strength.......................
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