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2026年第56卷第6期
Important Issuse
摘要：Laser powder bed fusion (LPBF) additive manufacturing technology enables the integrated forming of complex structures, significantly improving material utilization and shortening process routes, thus providing a new approach for the design and manufacturing of high-performance aviation metal components. However, LPBF technology faces critical challenges including low forming efficiency, poor process-quality stability, and difficulties in surpassing the mechanical performance of conventional processes such as forging and casting. This paper reviews recent domestic and international research progress in three aspects: forming equipment technology for complex components (large-area multi-laser collaborative processing, high-temperature preheating of build substrates, and dual-laser following printing), process-quality stability control methods (online monitoring of multi-physical parameters of the melt pool, data-driven intelligent machine learning, and beam shaping of irradiation heat sources and their combined application), and numerical simulation prediction methods (prediction of melt pool temperature and velocity fields, grain nucleation and growth prediction, and component stress-strain prediction). Furthermore, addressing the engineering application bottlenecks of LPBF in the aviation field, three future research directions are proposed: adaptive regulation of multi-laser process parameters, transfer learning-driven cross-material process transfer, and multi-sensor fusion in-situ defect elimination.关键词：aviation metal components;LPBF;multi-laser collaboration;process stability;numerical simulation203|95|0更新时间：2026-06-18- 摘要：The quality of metal parts fabricated by laser powder bed fusion is comprehensively influenced by key variables in multiple stages, including design, raw materials, equipment, and the forming process. This paper systematically reviews the key variables affecting part quality in the above stages and their research progress, aiming to lay a technical foundation for establishing process control requirements and a quality management system for this technology. The review indicates that existing studies mainly focus on the independent effects of single variables, with a lack of systematic analysis of multi-variable coupling effects. Accordingly, it is proposed that future work should classify parts according to different application requirements, explore and establish corresponding process control and audit standard specifications, achieve the quality goal of "once parts are produced, they are qualified right now", and thereby build a reliable, efficient, and healthy ecosystem for industrial development.关键词：laser powder bed fusion;key variables;metal part;research progress243|97|0更新时间：2026-06-18
- 摘要：To break through the core manufacturing bottleneck of integrated design and commercialization of advanced nuclear power plant heat exchangers in China, this research focuses on the newly designed heat exchanger with independent intellectual property rights, systematically analyzes its innovative structure, material selection and process requirements, and focuses on solving the technical problems of high-reliability welding. In response to the high-temperature sodium environment and complex structural characteristics, through the innovative development of manufacturing equipment, the development of anti-sodium corrosion welding joint processes, and the detection technology of the welding process, five core welding technologies have been successfully developed: the slot-type tube/tube sheet sealing weld welding process, the labyrinth seal wear-resistant layer surfacing welding process, the control measures for the geometric accuracy and dimensional deformation of the tube sheet - sleeve assembly and welding, the all-position butt welding process for small-diameter thin-walled tubes, and the low-deformation and high-efficiency stainless steel welding process for large multi-layer thin-walled austenitic stainless steel. A full-process welding quality control system has been formed. The research results fill the gap in the field of precision welding of nuclear-grade heat exchangers in China, establish independent process specifications and manufacturing standards, provide core technical support for the standardized design and engineering application of similar equipment, and effectively promote the implementation of the national major equipment independentization strategy.关键词：Advanced nuclear power technology;heat exchanger;welding technology267|118|0更新时间：2026-06-18
- 摘要：To address the adverse effects of water environment on weld quality, underwater laser welding of 4 mm thick 304 austenitic stainless steel was conducted using a local dry method. The drainage stability of a double-layer drainage hood was verified within 0-50 mm water depth. The influence of welding speed (0.8-1.2 m/min) on weld formation and porosity was systematically investigated, and the differences in microstructure and mechanical properties between underwater and conventional welds were compared. The results show that the local dry method effectively isolates the weld top surface from water, but the backside water environment promotes hydrogen entrapment and reduces keyhole stability. The porosity exhibits a decrease-then-increase trend with welding speed: the minimum of 1.4% is achieved at 1.0 m/min, metallurgical hydrogen porosity dominates at 1.2 m/min (7.8%), and process-induced porosity due to keyhole instability rises to 5.9% at 0.8 m/min. Enhanced heat dissipation from the backside water environment significantly refines the underwater weld microstructure and mitigates depression and hump defects under high heat input. Under optimal parameters (laser power 3800 W, welding speed 1.0 m/min, defocusing distance +3 mm), the underwater weld exhibits a tensile strength of 668 MPa and yield strength of 367 MPa, with tensile and bending properties slightly superior to conventional welds. Small-scale pores and minor backside inhomogeneity have negligible effects on mechanical performance.关键词：local dry method;underwater laser welding;porosity;microstructure;mechanical property280|120|0更新时间：2026-06-18
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Special Issues
Welding Virtual Simulation
Friction Stir Welding
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0 3 Research Progress of Additive Manufacturing Driven by Digital Twins
0 4 Research Progress of Wire Arc Additive Manufacturing Technology for Aluminum Alloy
0 5 Research Progress in Wire-Arc Additive Manufacturing of Magnesium Alloys
0 6 Current Status and Prospect of Multi-Scale Numerical Simulation of Laser Welding Process
0 7 Progress of Wire Arc Additive Manufacturing of Aluminum Alloys
0 8 Research Progress of Trajectory and Process Planning in Wire Arc Additive Manufacturing
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