Lianfeng Wei , Xianhao Chen , Di Xie , Meng Jiang , Yong Zheng , Baobin Ma , Jianguo Yang , Xi Chen , Yinlong Wang , Lin Zhu , Fangyuan Liu , Xuehan Li , Ran Zhang , Peng He , Yanbin Chen
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Study on the forming characteristics and molten pool behaviour of low vacuum swing laser welding of zirconium alloy
A study was conducted on the vacuum oscillating laser welding process and its mechanisms for zirconium alloy, in response to the need for developing new welding techniques for zirconium alloy cladding structural materials. Through metallographic inspection, X-ray detection, and high-speed imaging analysis, an in-depth examination of the weld formation and defects was carried out. Experimental results indicate that as the environmental pressure decreases, the plume phenomenon is effectively controlled, leading to a significant increase in weld penetration depth during vacuum laser welding of zirconium alloy. A comparative study of different oscillation parameters revealed that a circular oscillation trajectory produces the best weld formation. Furthermore, welding simulation studies uncovered the flow characteristics of the molten pool and the periodic variations of the keyhole in vacuum oscillating laser welding. The results show that after 0.25 s, the weld pool reaches a stable state. Within a single oscillation cycle, the keyhole depth reaches its maximum when the laser reaches the endpoint of the circular trajectory. Additionally, under the stirring effect of the laser, the molten pool exhibits a flow pattern consistent with the laser's movement direction.
期刊介绍:
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.