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40 results on '"Hu, Qingxian"'

14. Vpliv napetosti in jakosti električnega toka naobliko obloka med hibridnim varjenjem s postopkom TIG-MIG

Author

Zhang, Chao, Hu, Qingxian, Wang, Xiaoli, Dong, Zhuang, and Du, Daozhong

Subjects
električna napetost in tok, varjenje z varilno žico v obliki pletenice, oblika obloka, Polymers and Plastics, udc:621.791, voltage, metal inert gas welding, Metals and Alloys, arc shape, varjenje v zaščitnem plinu z volframovo elektrodo, cable-type wire, current, tungsten inert gas welding
Abstract

In order to achieve high efficiency, energy saving and high quality of welding, it is necessary to carry out research on cable-type wire TIG-MIG hybrid welding. In this study, voltage and current influences on the arc shape in cable-type wire TIG-MIG hybrid welding were studied. The results showed that in cable-type wire TIG-MIG hybrid welding, with an increase in the TIG current, the MIG current increased at first and then remained constant, while the MIG basic voltage remained unchanged. With an increase in the MIG voltage, the TIG current produced small changes, but overall, it remained stable. The TIG current of different droplet-transfer modes had different effects.

Published
2022

28. Arc Behavior and Droplet Transfer of CWW CO2 Welding

Author

Hu Qingxian, Chenfu Fang, Yong Chen, Xiao-yan Gu, Zhidong Yang, and Xu Guoxiang

Subjects
0209 industrial biotechnology, Materials science, Metallurgy, Metals and Alloys, 02 engineering and technology, Welding, 020501 mining & metallurgy, law.invention, Arc (geometry), Twisted pair, 020901 industrial engineering & automation, 0205 materials engineering, Mechanics of Materials, law, Turn (geometry), Electrode, Materials Chemistry, Waveform, Arc welding, Composite material, Beam (structure)
Abstract

Cable-type welding wire (CWW) CO2 welding is an innovative process arc welding with high quality, high efficiency and energy saving, in which CWW is used as consumable electrode. The CWW is composed of seven wires with a diameter of 1. 2 mm. One is in the center, while others uniformly distribute around it. The diameter of twisted wire is up to 3. 6 mm, which can increase the deposition rate significantly. With continual wire-feeding and melting of CWW, the formed rotating arc improved welding quality obviously. The arc behavior and droplet transfer were observed by the electrical signal waveforms and corresponding synchronous images, based on the high speed digital camera and electrical signal system. The results showed that the shape of welding arc changed from bell arc to beam arc with the increase of welding parameter. The droplet transfer mode changed from repelled transfer, globular transfer to projected transfer in turn. Droplet transfer frequency increased from 18. 17 Hz to 119. 05 Hz, while the droplet diameter decreased from 1. 5 times to 0. 3 times of the CWW diameter.

Published
2016

32. Effect of shielding gas flow rate on arc behaviors in GMAW with single cable-typed wire.

Author

Hu, Qingxian, Zhang, Lei, Pu, Juan, and Zhu, Caichen

Subjects
*GAS flow, *SHIELDING gases, *GAS metal arc welding, *PLASMA torch, *FLOW velocity
Abstract

A three-dimensional numerical model of arc in gas metal arc welding (GMAW) with single cable-typed wire was established based on the theory of arc physics. The influences of different shielding gas flow rates on the features of temperature field, velocity field and pressure field were investigated. The results showed that the maximum velocity of arc plasma along radial direction and the arc pressure on the surface of workpieces were increased obviously with the increase of the shielding gas flow rate, while the arc temperature was changed little. This phenomenon was mainly attributed to the increasing collisions between arc plasmas and the self-rotation action of cable-typed wires. The arc temperature at the tip of the cable-typed wire reached the maximum. The maximum flow velocity of arc plasma was located at the tip of wire (2–8 mm). The arc pressures in the central axis reached the maximum pressure. The simulation results were in agreement with the experimental results. [ABSTRACT FROM AUTHOR]

Published
2020
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33. Effect of solid content variations on PZT slip for tape casting

Author

Gang Jian, Hu Qingxian, Fu Qiuyun, Lu Sheng, and Dongxiang Zhou

Subjects
Tape casting, Materials science, Poling, Microstructure, Lead zirconate titanate, Structural characterization, Ferroelectricity, lcsh:TP785-869, Particle aggregation, chemistry.chemical_compound, Lead zirconate titanates, lcsh:Clay industries. Ceramics. Glass, chemistry, visual_art, Ceramics and Composites, Slurry, visual_art.visual_art_medium, Ceramic, Composite material, Piezoelectric properties
Abstract

Lead zirconate titanate (PZT) particles with pure tetragonal structure were synthesized by solid-state reaction method and used for preparation of slurries with different solid contents (34-80 wt.%). Then, PZT thick films were fabricated by the nonaqueous tape casting method. It was shown that the slurry prepared from ball-milled particles exhibited better rheology properties than slurry from particles which were not ball-milled. Measurement of sedimentation volumes and zeta potentials indicated particle aggregation, resulting in weak stability of the slurries with high solid contents. The microstructure, piezoelectric and ferroelectric properties of PZT sintered films were investigated in terms of solid contents. Ceramic films prepared from the slurry with solid contents of 73 wt.% had the optimal structure and properties. After poling at 200 ?C with an applied field of 1.2 kV/cm, a d33 of 294 pC/N was achieved; typical ferroelectric properties were also observed with a Ps of 38 ?C/cm2.

Published
2012

34. Numerical Analysis of Welding Residual Stress in Laser+MIG Hybrid Butt Welding of Medium- thick Aluminum Alloy

Author

Liu Peng, Hu Qingxian, Xu Guoxiang, Pan Haichao, Zhu Jie, and Guo Qinghu

Subjects
0209 industrial biotechnology, Thesaurus (information retrieval), Materials science, Applied Mathematics, Mechanical Engineering, Numerical analysis, Butt welding, Alloy, Metallurgy, chemistry.chemical_element, Welding residual stress, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Laser, Computer Science Applications, law.invention, 020901 industrial engineering & automation, chemistry, law, Aluminium, engineering, 0210 nano-technology
Published
2018

37. Effect of Interlayer on Microstructures and Properties of 304 Stainless Steel/Nb Joints by Laser Welding

Author

刘大双 Liu Dashuang, 陈书锦 Chen Shujin, 石铭霄 Shi Mingxiao, 胡庆贤 Hu Qingxian, 赵 健 Zhao Jian, 李瑞峰 Li Ruifeng, and 周方明 Zhou Fangming

Subjects
Materials science, law, Laser beam welding, Welding, Electrical and Electronic Engineering, Composite material, Microstructure, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention
Published
2017

39. Cold Cracking Sensitivity of a Newly Developed 9Cr2WVTa Steel.

Author

Wang, Jian, Lu, Shanping, Li, Yongkui, Hu, Qingxian, Rong, Lijian, and Li, Dianzhong

Subjects
STEEL alloy fractures, GAS tungsten arc welding, CRACK initiation (Fracture mechanics), MECHANICAL stress analysis, MICROSTRUCTURE, CHROMIUM iron alloys, FERROVANADIUM, EFFECT of temperature on steel
Abstract

Cold cracking susceptibility of the newly developed 9Cr2WVTa steel plate welded with the corresponding gas tungsten arc welding wire has been evaluated using the implant test and the Y-groove cracking test. Measurement of diffusible hydrogen content shows that the welding wire is ultra-low welding consumables (0.40 mL/100 g). Results of the implant test show that the fracture critical stress without pre-heating is only 300 MPa and increases up to the yield strength with pre-heating to 150 °C. The fracture critical stress under high heat input decreases to 250 MPa owing to the formation of quenched microstructure. Fractographies show ductile dimple fracture under higher loads and quasi-cleavage fracture under lower loads. Results of Y-groove cracking tests show that the minimum pre-heating temperature is 150 °C and the maximum transverse residual stress is located at the root of the weld metal. Therefore, the heat input should be chosen in a proper range and the pre-heating temperature is no less than 150 °C. [ABSTRACT FROM AUTHOR]

Published
2017
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