The selective laser melting (SLM) process gives a possibility to create complex shape parts. Joining SLM alloy parts to similar or dissimilar alloy parts can overcome some product design limitations such as limited dimensions and residual stress concentration. In this study, successful electron beam joining work on to SLM AISI 304 stainless steel plates was performed. The influence of beam current on the weld bead profile was investigated. Typical welded joints were analyzed by microstructure, microhardness, and tensile tests. The optimal welding parameters were obtained accordingly. A thorough analysis of the element and microstructure distribution in SLM and its influence on the properties of the welded joints were also investigated.
Post-weld heat treatment is a standard method to improve the performance of welded joints. Different heat treatment processes have different influences on the performance of welded joints. Therefore, it is of great significance to explore the impact of the heat treatment process on welded joints’ performance. This work applied three different heat treatment processes to the welded joints with three different properties. Then hardness test, impact test, tensile test, metallographic analysis and other means were used to evaluate the performance of welded joints after heat treatment. The following conclusions were drawn through the experiments: The change of phase compositions of the welded joints caused by the post-weld heat treatment was considered as the main reason for changes in mechanical properties of the welded joint. The difference in mechanical properties after different welding process and post-weld heat treatment combination was obtained, which has a guiding significance for practical production.
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