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13 results on '"Gao, Chenkai"'

12. Effect of heat input on interfacial microstructure, tensile and bending properties of dissimilar Al/steel lap joints by laser Welding-brazing

Author

Yang Jin, João Pedro Oliveira, Su Jiahao, Zhao Yixuan, Yu Zhishui, Gao Chenkai, Tan Caiwang, and Liu Hongbing

Subjects
0209 industrial biotechnology, Materials science, Alloy, 0211 other engineering and technologies, Laser beam welding, 02 engineering and technology, Welding, engineering.material, Microstructure, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, 020901 industrial engineering & automation, Lap joint, law, Ultimate tensile strength, engineering, Brazing, Laser power scaling, Electrical and Electronic Engineering, Composite material, 021102 mining & metallurgy
Abstract

Laser welding-brazing technique was used for lap joining of Q235 steel to AA5052 aluminum alloy using a flux-cored Zn-22Al filler wire. The influence of heat input on microstructure, joint strength and bending property of laser Al/steel joints was investigated. The results showed that the types of interfacial intermetallic compounds (IMCs) were kept unchanged with the different laser powers, i.e., Fe2Al5-xZnx phase and FeZn10; while the thickness and morphology of IMC layer changed significantly. This was mainly ascribed to the large increase of the interfacial temperature with the rising laser power, which led to an intensified diffusion reaction. The fracture load first increased and then reached a plateau with the increasing laser power. However, the laser power had very limited influence on the joint bending property because of the formation of dispersed tough FeZn10. Numerical simulation indicated that the interfacial temperature along the interfacial region varied, decreasing from the weld root to weld toe. The peak temperature increased by 700 ℃ and liquid–solid reaction time increased 3.41 s with the increased laser power, which was responsible for the change of IMCs layer.

Published
2021

13. [Effect of septoplasty on the modality of inferior turbinate: a CT study].

Author

Xu J, Gao C, He D, Zhang H, Ma C, and Thou Y

Subjects
Adolescent, Adult, Female, Humans, Male, Middle Aged, Tomography, X-Ray Computed, Young Adult, Nasal Septum surgery, Rhinoplasty, Turbinates diagnostic imaging
Abstract

Objective: To explore the effect of septoplasty on the modality of inferior turbinate in patients with a deviated nasal septum., Method: Twenty-three patients with nasal septum deviation underwent septoplasty without turbinate surgery. All patients underwent CT imaging scans before and 3 months after the surgery. The thicknesses of the medial mucosa, lateral mucosa,and the cross-sectional areas of the inferior turbinate were measured and compared using the Wilcoxon signed rank test. P<0. 05 was considered statistically significant., Result: On the concave side of the septum, the thickness of the medial mucosa of the inferior turbinate was(5. 3+/-1.5) mm to (4. 1+/-1. 2) mm (P<0. 05), the thicknesses of the lateral mucosa of the inferior turbinate was(2. 5+/-0. 9) mm to (2.0+/-0. 9) mm (P>0. 05), and the cross-sectional area of the inferior turbinate was(139. 8 +/- 35.6) mm2 to( 110. 3 +/- 22.6)mm2 (P<0.05), pre- and post-operatively. On the convex side of the septum , the thickness of the medial mucosa of the inferior turbinate was(1.0 +/- 0. 6) mm to(4. 3 +/- 0. 6) mm (P>0. 05), the thicknesses of the lateral mucosa of the inferior turbinate was(1. 9+/-1. 1) mm to (1. 9+/-1.3) mm (P>0. 05), and the cross-sectional area of the inferior turbinate was(104. 5+/-15. 8)mm2 to(108. 3 +/- 20. 8)mm2 (P>0. 05), pre- and post-operatively., Conclusion: The compensatory hypertrophic inferior turbinate may be self-adaptability in modality soon after septoplasty, thus surgeons must take it into consideration before performing turbinate surgery.

Published
2013

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