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VACUUM ›› 2022, Vol. 59 ›› Issue (3): 74-79.doi: 10.13385/j.cnki.vacuum.2022.03.15

• Measurement and Control • Previous Articles     Next Articles

Soldering and Sealing Process of T2-304 in Space Environment Simulation Equipment

FENG Zhi-meng, LIU Chang-peng, LU Tong-shan, LI Can-lun, WANG Xiao-zhan, NI Jun, WANG Guo-fang   

  1. Shanghai Institute of Spacecraft Equipment, Shanghai 200240, China
  • Received:2021-07-07 Online:2022-05-25 Published:2022-06-01

Abstract: In order to solve the problem of poor reliability of brazing seal in space environment simulation equipment due to the large installation gap between heat sink and vacuum container, the following methods were adopted. Remove the oxide layer of base metal and solder surface before welding. BAg45CuZn eutectic solder with 45% silver content is selected. The welding heat source with external flame temperature of about 900℃ is used. Heat sink copper pipe and stainless steel pipe with larger wall thickness are selected. The welding gap is controlled in 0.1mm to 0.2mm by welding auxiliary parts. The welding heating time is controlled in 30s. After brazing and sealing of stainless steel pipe and copper pipe with the above processes, the welding test results are good and the welding seam is reliable. Leak detection is carried out by helium mass spectrometer after cyclic impact at low temperature of -186℃ and high temperature of 120℃ on the weld. The leak detection data prove that the sealing performance of the weld meets the use requirements of the equipment.

Key words: brazing seal, welding process, dissimilar metal welding, heat sink

CLC Number: 

  • TG454
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