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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Cold welding sealing of copper-water micro heat pipe ends
TANG Yong(汤 勇), LU Long-sheng(陆龙生), DENG Da-xiang(邓大祥), YUAN Dong(袁 冬)

School of Mechanical and Automotive Engineering, South China University of Technology,
Guangzhou 510640, China

Abstract:The quality of micro heat pipe(MHP) is strongly affected by sealing technology. Based on the analysis of requirements of sealing technology, a cold welding technology was presented to seal MHP. In the cold welding process, compression force was used to flatten micro groove copper(MGC) tube. Then the bonding of MGC tube was reached because of intensively plastic deformation of MGC tube under pressure. It is found that the plastic deformation area of the cold welding of MGC tube can be divided into three sections. The deformation of micro grooves in each section was investigated; the influence of the dimensions of cylindrical heads on the weld joint shape and strength was studied; and a comparison between smooth copper tube and MGC tube was done. The results show that a groove compression stage exists in the cold welding of MGC tube besides a flattened stage and a melting stage.

 

Key words: heat pipes; cold welding; sealing technology; groove copper tube

ISSN 1672-7029
CN 43-1423/U

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