Study on welding wire and performance of welded joint for N50 stainless steel jacket
For the CICC conductor jacket,SGN50WG stainless steel welding wire was developed through designing the com-position and using processes such as vacuum melting,electroslag,rolling and drawing.This welding wire was then employed to weld N50 circle-in-square tubes for CICC jacket by TIG welding.The microstructures and mechanical properties of the welded joints were thoroughly characterized and tested.The results demonstrate that all welded joints exhibit excellent bonding between the weld metal and the base metal.These joints exhibit excellent strength and toughness at 4.2 K after cold-deformation and conductor heat-treatment with yield strengths of 1 442 MPa and 1 378 MPa at the corner position and plane position respective-ly,ultimate tensile strengths of 1 698 MPa and 1 684 MPa,elongations of 23.8％and 20.1％,and fracture toughness as high as 195 MPa·m1/2,suggesting this welding wire has promising potential as a welding material for CICC jacket.
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