Performance Optimization Of Flux-cored Wire With Composite Deoxidizer For Wire Arc Additive Remanufacture

Compared with traditional manual surfacing repair technology,the wire arc additive manufacturing technology repair mold has many advantages,but the traditional welding materials cannot meet the requirements of the technology.Although the domestic manual surfacing RMD535flux-cored wire has excellent performance,it cannot be continuously welded due to its high slag content.In this paper,the slag content is reduced on the basis of the welding wire,and in order to enhance the protection effect of the welding wire,the composition ratio of the composite wire deoxidizer is optimized to develop a method of welding wire that can be truly applicable to the mold wire arc additive remanufacturing.First,using welding spatter rate measurement,welding seam formation observation,hardness and toughness measurement and other methods to study the effect of slag content on wire performance,it was found that when the slag content in the wire is 15%,the wire can be continuously welded,and there is less spatter during welding,as well as good slag coverage and weld formation,and the deposited metal has excellent mechanical properties.Secondly,the content of aluminum-magnesium alloy in the welding wire was adjusted.The research results showed that when the content of aluminum-magnesium alloy in the welding wire is1.2%,the droplet transition is thinner during welding,the spatter is also small,and the weld has a good macro-shape;The acicular ferrite content in the deposited metal is large,the overall microstructure is uniform and fine,and the deposited metal has high hardness and good toughness.Furthermore,the effects of titanium content on the mechanical properties of the welding wire were analyzed by methods such as metallographic observation and scanning electron microscope analysis.It was found that when the ferrotitanium content in the welding wire is 1.8%,the inclusions in deposited metal are relatively small,the microstructure contains more acicular ferrite but less proeutectoid ferrite,and the overall mechanical properties are excellent.Further adjusting the content of ferrosilicon in the welding wire,it was found that with the increase of the content of ferrosilicon in the welding wire,the large-sized inclusions in the deposited metal tend to decrease first and then increase,while the hardness of the deposited metal gradually increases and the toughness gradually decreases.When the ferrosilicon content in the welding wire is1.6%,the deposited metal has good toughness while having high hardness.Finally,by comparing the performance of the final test wire with the basic wire,it was found that the test wire has excellent overall performance.Comparing the performance of the welding wires with different diameters,it is found that the welding wire with a diameter of 1.6 mm not only has good macroscopic forming of the weld seam and excellent comprehensive mechanical properties,but also guarantees high production efficiency.The slag content of the flux-cored wire developed in this article is 15%,the content of aluminum-magnesium alloy is 1.2%,the content of ferrotitanium is 1.8%,the content of ferrosilicon is 1.6%,and the diameter is 1.6mm.It has good process and mechanical properties,can realize continuous welding,and has high production efficiency,which can meet the requirements of mold wire arc additive remanufacturing.