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摘要：As a key technology in the manufacturing process of marine engineering equipment, ships, nuclear power pipelines and other fields, the thick plate welding quality determines the safety performance and service life of the equipment.Narrow gap submerged arc welding and narrow gap gas metal arc welding arewidely applied to the welding of plate with the thicknessof more than 20 mm,their higher heat input and high residual stress in the joints limit their application in welding of thick steel plate with high heat sensitivity.Laser welding has the advantages of high energy density, small heat-affected zone, small welding deformation, andsoon, whichis fit for welding of thick steel plate. Laser welding, laser welding with filler wire and laser-arc hybrid welding for narrow gap joint were introduced, their characteristics and problems were analyzed. Among them, laser-arc hybrid welding has the characteristics of higher welding efficiency, higher deposition rate and less thermal damage, which is one of the proper methods to weld thick plate.Atlast,the development prospect of laser welding technology in the weldingmanufacturing of thick plate were summarized and proposed.关键词：narrow gap laser welding;thick plate;laser welding;laser-arc hybrid welding- 5
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更新时间：2024-07-26- 摘要：The CuCrZr alloy possesses excellent thermal and electrical conductivity, as well as good mechanical properties, making it an important material for aerospace, nuclear reactor components, and other fields. This study analyzes the forming performance of CuCrZr alloy prepared by selective laser melting (SLM), focusing on the effects of three main process parameters—laser power, scanning speed, and scanning spacing—on the alloy’s density, microstructure, and microhardness. The research indicates that the pores in SLM-formed CuCrZr alloys are primarily caused by incomplete powder melting and gas pores. As the volumetric energy density increases, the pore type gradually transitions from powder melting incompleteness to gas pores. The alloy exhibits higher density when the scanning spacing is 0.12 mm compared to 0.09 mm. The optimal process parameters are 360 W laser power, 800 mm/s scanning speed, 0.12 mm scanning spacing, and 0.03 mm layer thickness, achieving a density of 99.30% with a volumetric energy density of 125 J/mm3. The microstructure of the alloy features large grains surrounding smaller grains, with irregular and randomly distributed grain shapes, reflecting the anisotropy of grain growth caused by the non-uniform temperature field during SLM forming. The microstructure morphology differs significantly in different building directions, with equiaxed grains dominating on the XY plane, while the XZ plane shows a large number of columnar grains growing along the building direction. Additionally, the process parameters have a minimal impact on the microhardness value of SLM-formed CuCrZr alloys, with density exerting a more significant influence on hardness. Higher hardness values are observed in areas with finer or elongated grain aggregation. SLM technology can be utilized to fabricate high-performance CuCrZr alloys, and optimizing process parameters can result in high density, fine and uniform microstructure, and high hardness.关键词：SLM;CuCrZr alloy;forming performance;microstructures;hardness
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更新时间：2024-07-26 - 摘要：Iron-chromium gradient coatings were prepared on 45 steel substrates using laser cladding technology to address the wear issue of screw drills. To tackle the common cracking problem during the cladding process, an optimization strategy was proposed to regulate the powder composition of the gradient coatings. Gradient hardness was achieved using cladding powders with different carbon contents, and the interface bonding was improved by introducing a JG-3 transition layer. The study revealed that the gradient coatings exhibited a gradual increase in hardness and enhanced wear resistance. The JG-3 transition layer effectively promoted the interfacial bonding between the substrate and the cladding layer, connecting different hardness layers and preventing cracking. Fracture morphology analysis indicated that the cladding layer exhibited typical “river pattern” cleavage fracture characteristics. Irregular metal oxides could tear the cladding layer matrix, significantly reducing its performance. Therefore, surface polishing of each layer after cladding is recommended to ensure complete removal of interfacial oxide layers. The prepared iron-chromium gradient coatings maintained a smooth and crack-free interface, providing an effective solution and basis for addressing cracking issues during the cladding process of gradient coatings.关键词：laser cladding;gradient coating;interface behavior;hardness;cleavage fracture
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更新时间：2024-07-26 - 摘要：For the large-scale welding equipment production site, due to the lack of data in the production process of welding equipment, complex business processes, and lack of information management and control in the welding process, the information transmission efficiency is low and errors are prone to occur. It is urgent to strengthen the information construction of the monorail frame welding in the production management link. This paper introduces an intelligent welding group control system for monorail frames based on industrial LAN, big data and cloud platform. The real-time monitoring and network management of manual and automatic welding machine state are carried out. At the same time, the problem that manual welding parameters can not be automatically matched is solved. It improves the automation and intelligence level of welding equipment, and realizes efficient and intelligent welding information management.关键词：monorail frame;welding;intelligent control system;parameter matching
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更新时间：2024-07-26
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