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Eletric Welding Machine

Eletric Welding Machine
  • ISSN:1001-2303
  • CN:51-1278/TM
  • 出版周期：Monthly
  • 电话：028-83289008
  • 地址：bj＠toweld.com
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Volume 55 期 6，2025 2025年55卷第6期

  • Smart Electric Power Welding

    CHEN Zhongbing, LU Li, QI Bojin, CONG Baoqiang, QI Zewu, SHANG Jianlu, LIANG Zhenxin

    DOI：10.7512/j.issn.1001-2303.2025.06.01
    摘要：Slow Strain Rate Tensile (SSRT), U-bend and Compact Tension (CT) tests were conducted to simulate the high-temperature and high-pressure water environment of a pressurized water reactor (PWR) nuclear power plant. The stress corrosion properties of the Inconel 690 alloy overlay welds fabricated using ultrasonic frequency pulsed square wave arc (UFP) tungsten inert gas (TIG) welding were evaluated and compared with those of constant direct current (DC) TIG welding overlays. The results showed that neither the UFP nor the DC specimens exhibited signs of localized discontinuous brittle cracking in the SSRT tests. In the U-bend tests, two DC specimens exhibited cracks prior to immersion, and after immersion, these two specimens developed multiple cracks with lengths of 304 μm and 550 μm, respectively. The other DC specimen and all three UFP specimens showed no defects before immersion and remained smooth and intact without any signs of corrosion damage and defects after immersion. In the CT tests, the crack propagation rates varied with different sampling directions and hydrogen contents. The average crack propagation rates for the DC and UFP specimens were (1.766-2.088)×10-3 mm/y and (2.372-2.889)×10-3 mm/y, respectively, corresponding to crack propagation lengths of 0.11-0.13 mm and 0.14-0.17) mm after 60 years of design life. Based on the comprehensive results of SCC initiation and propagation tests, it was concluded that the Inconel 690 alloy UFP-TIG overlay welds exhibits negligible SCC susceptibility in the simulated PWR primary water environment.  
    关键词：ultra-high frequency pulsed square wave arc;Inconel 690 alloy;stress corrosion crack;PWR primary water environment;slow strain rate tensile test;U-bend test;compact tensile test   
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    更新时间：2025-06-30

    LI Taijiang, LI Wei, Mi Zihao, SUN Qi

    DOI：10.7512/j.issn.1001-2303.2025.06.02
    摘要：In order to study the microstructure and properties of different regions of welding heat affected zone (HAZ) of 1 000 MPa grade ultra-high strength steel, the microstructure of test steel at different peak temperature of thermal cycle was prepared by welding thermal simulation technique. The results showed that in the subcritical region of HAZ (SCHAZ), the intercritical region （ICHAZ） and the fine-grained region （FGHAZ）, the impact absorption energy and crack propagation energy of the sample were relatively high, and a large area of fiber region and shear lip were formed on the fracture. Dimples of different sizes can be seen. In the coarse-grained region (CGHAZ), the impact absorption energy and crack propagation energy of the sample both decreased to a very low value, indicating that the resistance to crack propagation decreased, the instability propagation was fast, and the impact toughness of the sample decreased. The fracture showed a macroscopic brittle fracture, almost all of which are radiological regions. Microcosmic quasi-cleavage fracture features can be seen. The CGHAZ region is a ductile valley region in HAZ. The results showed that the coarse grains and the coarse M-A island were the main causes of embrittlement in the CGHAZ region. This research lays a theoretical foundation for the selection, development and engineering application of 1 000 MPa grade ultra-high strength steel in hydropower projects.  
    关键词：ultra-high strength steel;welding thermal cycle simulation;welding heat affected zone;instrumented impact   
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    更新时间：2025-06-30

    LUO Yongfei, DOU Quanshan, YANG Jun

    DOI：10.7512/j.issn.1001-2303.2025.06.03
    摘要：The Power station boilers employ a large number of small-diameter pipes, and the connections between steel pipes mainly utilize mechanical type hot wire TIG welding. Apart from automatic welding after arc initiation, all other processes require manual completion by welders, including material loading, weld pairing, internal argon gas feeding, pipe port cleaning, and welding parameter fine-tuning, leading to high labor intensity for welders, poor operating environments, unstable weld quality, and high skill requirements for welders. A new intelligent assembly and welding production line for small-diameter pipes based on hot wire TIG welding is proposed. Under the control of PLC and supervisory computers, this production line can achieve full process automation, including automatic material loading, automatic internal argon gas feeding, automatic weld pairing, automatic arc initiation welding, and automatic labeling. Operators do not need to intervene in the welding process, and except for replacing the tungsten electrode and welding wire, all other tasks can be remotely monitored. The working environment is comfortable, labor intensity is low, and after safety and operation training on the equipment, welders can start working. The production line is suitable for small-diameter pipes of various materials, including carbon steel, heat-resistant steel, and stainless steel. The production line has been successfully put into operation, with a high qualification rate for radiographic RT inspection of the welds, attractive appearance of the weld surface formation, and stable and reliable quality.  
    关键词：small-caliber pipe;hot-wire TIG welding;intelligent group welding;intelligence   
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    更新时间：2025-06-30

    GAN Hongfeng, MA Yiming, LI Haijun, LI Jing, GUO Xiao, TIAN Jingcheng, WU Hailong

    DOI：10.7512/j.issn.1001-2303.2025.06.04
    摘要：To explore UT and The causes of the small size equivalent density exceeding the standard detected by TOFD were studied using macroscopic and microscopic metallographic analysis, defect morphology characterization, and other methods to investigate the properties, distribution patterns, and causes of typical welding defects that passed the RT test. The results indicate that the frequent TOFD detection of small-sized equivalent density exceeding welding defects includes hydrogen induced porosity defects, slag inclusion defects, and linear defects such as reheat cracks. Its formation is related to the conditions of molten pool escape, interlayer/inter pass temperature and welding line energy control, and the degree of dehydrogenation (metallurgical reaction). By adopting the DC pulse MAG welding method to enhance the fluidity of the molten pool and increasing the proportion of CO2 in the welding protective gas to promote metallurgical reactions, the development of process improvement measures has effectively eliminated the generation of dense micro pores and slag inclusions in the weld seam; By controlling the interlayer/pass temperature and welding line energy, the generation of reheat cracks in the weld seam has been effectively eliminated. It is of great significance to improve the performance of 1 000 MPa high-strength steel welded joints and the service reliability of components.  
    关键词：high strength steel;TOFD detection;welding porosity;DC pulse MAG;protective gas ratio   
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    更新时间：2025-06-30
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  1. 0 1 Research Progress of Additive Manufacturing Driven by Digital Twins

    DING Donghong, JI Jiang, ZHANG Zixuan, DING Xiaofei 1401 | 846 | 0

  2. 0 2 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 1357 | 517 | 0

  3. 0 3 Research Progress of Trajectory and Process Planning in Wire Arc Additive Manufacturing

    ZHAO Tao, YAN Zhaoyang, JIANG Fan, CHEN Shujun 1310 | 344 | 0

  4. 0 4 Progress of Wire Arc Additive Manufacturing of Aluminum Alloys

    DONG Bolun, CAI Xiaoyu, XIA Yunhao, LIN Sanbao 1207 | 618 | 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 1177 | 742 | 0

  6. 0 6 Research Progress of Wire Arc Additive Manufacturing Technology for Aluminum Alloy

    FANG Xuewei, YANG Jiannan, CHEN Ruikai, HUANG Ke, LU Bingheng 1176 | 1002 | 0

  7. 0 7 Current Status and Prospect of Multi-Scale Numerical Simulation of Laser Welding Process

    LIANG Guodong, DONG Bin, QIN Guoliang 1080 | 666 | 0

  8. 0 8 Wire Arc Additive Manufacturing Technology and Application of Aluminum Alloy Lattice Structure

    ZHENG Bo, YU Shengfu, YU Runzhen, LI Yongjie, TANG Lun 1000 | 651 | 0

  9. 0 9 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 954 | 383 | 0

  10. 10 Prediction on the Welding Distortion During Full-cycle Manufacturing of Nuclear Power Key Structures based on Digital Twins

    ZHENG Wenjian, FENG Daochen, LI Renhou, YANG Jianguo 899 | 134 | 0

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