Research On Arc Additive Manufacturing Technology Of 5083 Aluminum Alloy-low Carbon Steel Heterogeneous Material Structure

In the early stage of shipbuilding,most of the materials used in the shipbuilding industry are steel structures.However,with the progress of science and technology and the maturity of technology,in order to achieve lightweight to obtain higher ship speed,the shipbuilding industry generally uses aluminum and aluminum alloy structures with lower density and better performance.Thus put into use of aluminum alloy can’t avoid the position of the two kinds of material structure connected to each other.However,the physical properties of aluminum and steel are very different^[1],so there are many problems in the direct connection of aluminum and steel.Based on the above points,this paper first studies the Marine 5083aluminum alloy arc additive manufacturing process,and then on this basis,the 5083aluminum alloy-low carbon steel heterogeneous material structure arc additive manufacturing process.Marine 5083 aluminum alloy arc additive manufacturing process research is mainly based on the existing experimental literature data,through the data calculation and simulation,using FD V6 welding robot to operate,complete Marine aluminum alloy TIG arc additive manufacturing experiment.In the experiment,5083 aluminum alloy was selected as the base plate and ER5356 aluminum alloy welding wire was selected as the additive material to study several welding parameters that affect the weld appearance and forming size.After optimizing the parameters,the aluminum alloy wall was manufactured by using the parameters,and the microstructure was observed and the mechanical properties were analyzed.The results show that when the welding current,welding speed and wire feeding speed are 100A,30cm/min and 140cm/min,and the pulse frequency is 100Hz,the aluminum alloy wall obtained has beautiful appearance and good internal microstructure performance.The tensile test shows that the tensile strength can reach 264.04MPa,83%of the base metal strength,and the fracture elongation is 20.09%.In the research of 5083 aluminum alloy low carbon steel dissimilar structure arc additive manufacturing process,Q235 low carbon steel plate is mainly used as the base plate,and ER5356 aluminum alloy welding wire is also selected as the additive material.In the experiment,the single-layer single pass weld forming is studied firstly,and the influence of welding parameters on the weld appearance forming is discussed in the two cases of using solder and not using solder.The parameters are optimized.Then,the optimized forming parameters are used to make the test piece,and the microstructure of the test piece and the grains and grain boundaries after the corrosion of the structure are observed.Finally,the scanning electron microscope and energy are used The chemical composition of the interface was analyzed by spectrograph.The results show that when the parameters of welding current,wire feeding speed and welding speed are 180A,160cm/min and 25cm/min,the macro forming of the weld is uniform and complete without spatter,the welding process is stable,and there are only a few defects in the internal microstructure.The aluminum side is mainly composed ofα-Al matrix,fine crystal area and columnar crystal,and the microstructure and properties are improved.