SAl 5183船用铝合金焊丝工艺焊接性及接头力学性能研究OA

This article takes the SAl 5183 new model marine aluminum alloy welding wire as the research object,using TIG/MIG welding technology to conduct vertical upward welding,overhead welding,and flat welding on 5083-H116 aluminum alloy to study the welding performance of this model of welding wire.The research includes tests on the properties of the deposited metal,chemical composition analysis,mechanical performance testing of the welded joints,and microstructural analysis.The results indicate that the tensile strength of the deposited metal reaches 291MPa with an elongation of 30％,and its chemical composition meets the requirements of CCS material and welding processes.Tensile tests on the joints show that the tensile strength of the MIG welded joints is slightly higher than that of the TIG welded joints,while the mechanical properties of the vertical up,overhead,and flat welded joints under the same welding technique are similar,with tensile strengths reaching 90％of the base material's tensile strength.Microstructural examination reveals the presence of white dispersed phase Al6(Fe,Mn)compounds in the weld zone under different welding processes.Notably,when using MIG flat welding and vertical up welding processes,the size of precipitate phase in the welded joints is relatively larger,resulting in better dispersion strengthening effects.Additionally,the weld zone exhibits the solid solution strengthening effect of Mg elements,with a more uniform distribution of Mg in the joints produced by MIG vertical up welding,TIG vertical up welding,and TIG overhead welding,leading to enhanced solid solution strengthening effects.These two strengthening effects ensure the welded joints possess good tensile strength.