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  • Vol. 53  期 8， 2023 2023年 53卷 第8期

    • Welding of Non-Ferrous Light Metal

      BAO Songjie,SUN Tingting,FANG Naiwen,FENG Xiaobing,HAN Xiaohui,QIN Jian,WU Pengbo,WANG Zhaochen,HE Guangzhong

      摘要：In view of the lack of functional, practical and effective online detection methods for welding energy consumption in the industry, an online detection system was proposed and constructed, and a set of practical energy consumption detection system was developed to achieve the acquisition of key energy consumption parameters of titanium alloy plate-fin heat exchanger shell in the process of laser wire filling welding. The effectiveness of the detection system and method was verified through experiments. The results show that it can be widely used in energy consumption monitoring, analysis management and energy saving optimization of parts in welding process. This will help to evaluate the welding industry in a reasonable and effective way, and provide technical support for the future establishment of welding energy consumption detection standards and green factory evaluation.  
      关键词：titanium alloy;plate-fin heat exchanger;welding processing;energy consumption detection   
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      发布时间：2023-09-08

    • YANG Qingfu,ZENG Caiyou,ZHANG Yupeng,QI Bojin,CONG Baoqiang,WU Pengbo

      摘要：A comparative study was conducted focusing on the microstructural inhomogeneities and their effect on the mechanical behavior of magnetically controlled narrow gap TIG welding (MCNG-TIG) and vacuum electron beam welding (EBW) of large-thickness TC4 titanium alloy joints. The microstructure of different regions, including the weld zone and heat affected zone, in the middle of the two joints was characterized using scanning electron microscopy. Moreover, the micro-hardness distribution and room temperature tensile properties of the joint sections were measured. The results showed that the weld zone of both joints had a basketweave structure. But the α lath width in the MCNG-TIG weld was finer than that of the EBW weld. The heat-affected zone is a mixture of primary α phase + β-transformed structure. The content of β-transformed structure decreases with increasing distance from weld seam center. β-transformed structure in the MCNG-TIG heat affected zone is finer than that in the EBW heat affected zone. The average hardness distribution of the MCNG-TIG joints is: heat affected zone > base metal > weld seam; the average hardness value distribution of the EBW joints is: weld seam > heat affected zone > base metal. The room temperature tensile strength coefficients of both joints were above 0.9, and the strength and elongation of EBW joints were slightly higher than those of MCNG-TIG joints. The room tensile fracture location of MCNG-TIG joints was located in the heat-affected zone near the base metal, while the fracture location of EBW joints was in the weld seam center. The tensile strain evolution results showed that in the early stage of tensile testing, the MCNG-TIG joints showed both peak strain regions in the weld and in the heat affected zone near the base material. As the tensile proceeds, the double strain peak region feature disappears and the plastic strain is mainly concentrated in the heat-affected zone near the base metal.  
      关键词：titanium alloy;large-thickness plate;narrow gap welding;EBW;microstructure inhomogeneity;mechanical properties   
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      发布时间：2023-09-08

    • CHEN Yuhua,WU Hongyan,ZHOU Chunpei,JIA Lichao,SHEN Wenlong,XIE Jilin

      摘要：The Al/Cu dissimilar metals were welded using the external heating assisted magnetic pulse welding technique, and a comparative analysis was conducted on the macroscopic morphology, interface structure, and mechanical properties of the welded joints under different external heating temperatures, namely room temperature, 100 ℃, and 200 ℃. The results demonstrate that the external heating assisted electromagnetic pulse welding technique can achieve high-quality welding of Al/Cu dissimilar metals. With increasing external heating temperature, the size of the effective bonding area of the welded joint increases. The wavy interface morphology exhibits different forms depending on the external heating temperature: at room temperature, the interface shows a mixed waveform of sine waves and shear waves; at 100 ℃, an irregular embedded waveform morphology is formed; at 200 ℃, the morphology is similar to that at room temperature, but the thickness of the interface reaction layer is maximum. Al-Cu compounds were detected in the interface reaction zones under all three conditions. The mechanical property test results indicate that as the external heating temperature increases, the mechanical performance of the welded joint gradually improves. When the heating temperature is 200 ℃, the tensile-shear strength of the welded joint reaches 4 076 N. All specimens fractured at the joint interface, exhibiting a mixed fracture morphology of "river-like" and ductile dimples, suggesting a ductile-brittle mixed fracture as the failure mode of the welded joint. Under the influence of the external heating, the increase in the effective bonding area of the welded joint and the changes in the interface waveform structure effectively enhance the mechanical properties of the joint.  
      关键词：magnetic pulse welding;external heating-assisted;Al/Cu dissimilar metals;microstructure;mechanical properties   
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      发布时间：2023-09-08

    • LIU Xiyang,WANG Yang,YANG Miaosen,MA Yiming,LUO Jiutian,WU Pengbo

      摘要：The effects of aging time on microstructure, thickness and composition of intermetallic compounds (IMC) were studied by means of SEM and EDS.The results show that the interfacial structure of SnInBi brazing metal is significantly affected by the aging time under load.With the increase of load aging time, the continuity of IMC layer becomes better, the bulges near the matrix disappear, and the small bulges on the near low temperature filler metal side merge and extend to the low temperature filler metal side. The thickness and growth rate of interfacial IMC layer increased with the increase of loading aging time (the thickness increased by 5 times at 720 h, and the average growth rate reached 0.021 4 μm/h). There is no obvious segregation of Bi element distribution with aging time. The diffusion of Cu into the IMC layer is obvious, accompanied by the growth of bulges on one side of the directional low temperature filler metal. In elements have uneven distribution and uniform distribution changes. The distribution trend of Sn element is opposite to that of In element. When the load time reaches 480 h, the rich in layer and rich Sn layer appear on the brazed interface, and the rich Sn layer thickness reaches 41.43 μm.  
      关键词：IMC;on-load aging;SnInBi solder;soldering interface   
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      发布时间：2023-09-08
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    1. 0 1 Research Progress and Prospect of Wire and Arc Additive Manufacturing with Low Heat Input and High-efficiency Forming

      ZHANG Hanyan,XIONG Jun,CHEN Yong,CHEN Hui 1051 | 75 | 0

    2. 0 2 Research Progress of Additive Manufacturing Driven by Digital Twins

      DING Donghong,JI Jiang,ZHANG Zixuan,DING Xiaofei 904 | 57 | 0

    3. 0 3 Progress of Wire Arc Additive Manufacturing of Aluminum Alloys

      DONG Bolun,CAI Xiaoyu,XIA Yunhao,LIN Sanbao 791 | 47 | 0

    4. 0 4 Effect of Ultrasonic Impact Treatment on the Microstructure of Low Carbon Steel Fabricated by Wire and Arc Additive Manufacturing

      SUN Laibo,HUANG Ruisheng,WU Pengbo,XU Fujia,FANG Naiwen 786 | 30 | 0

    5. 0 5 Research Progress in Wire-Arc Additive Manufacturing of Magnesium Alloys

      CAO Qianhui,ZENG Caiyou,ZHANG Ruize,WANG Haibo,QI Bojin,CONG Baoqiang 784 | 41 | 0

    6. 0 6 Wire Arc Additive Manufacturing Technology and Application of Aluminum Alloy Lattice Structure

      ZHENG Bo,YU Shengfu,YU Runzhen,LI Yongjie,TANG Lun 709 | 42 | 0

    7. 0 7 Research Progress of Trajectory and Process Planning in Wire Arc Additive Manufacturing

      ZHAO Tao,YAN Zhaoyang,JIANG Fan,CHEN Shujun 703 | 64 | 0

    8. 0 8 Study on Forming Characteristics for Double-tungsten TIG Arc-based Additive Manufacturing

      HAN Qinglin,HE Ao,LI Xinlei,ZHANG Guangjun,LI Wenhang 678 | 43 | 0

    9. 0 9 Effect of Active Interpass Cooling on Temperature and Thermal Stress Evolution of Wire Arc Additively Manufactured Ti6Al4V Alloy

      ZHANG Yunshu,SHAO Dandan,DING Donghong,WU Bintao 555 | 37 | 0

    10. 10 Research on Superaudio MIG Assisted Triple Wire Arc Additive Manufacturing Process

      ZHANG Jiaheng,HUANG Yi,GUO Shun,YANG Dongqing,YAN Dejun,LI Dong,WANG Kehong 527 | 34 | 0

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