|Table of Contents|

Analysis on pulse laser welding for membrane isolation valve (PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2023年02期
Page:
107-114
Research Field:
目次
Publishing date:

Info

Title:
Analysis on pulse laser welding for membrane isolation valve
Author(s):
YANG Yi;  WANG Jiping;  DONG Jiye;  XIE Qing;  CHANG Tao;  LIU Zhao
(Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
Keywords:
membrane isolation valve;  orthogonal test;  pulse laser welding;  weld quality;  modified power density
PACS:
TG456.7
DOI:
-
Abstract:
Membrane isolation valve is widely used in monopropellant liquid rocket engines, and the laser welding for the metal membrane and the shell is an important process that should be focused on.By analyzing the structure of the product, it is concluded that the thermal conductivity pulse welding is suitable for the membrane isolation valve.As meanwhile, the conclusion of selecting short focal lens and lower peak power can ensure the quality of the welded joint was also obtained.To obtain the influences of parameters of pulse width, pulse frequency, overlap factor and welding frequency on weld penetration, orthogonal test was designed.By analyzing appearance and penetration of the welded joint, the primary sequence of four parameters and matched process parameters for membrane isolation valve were obtained.The modified power density was proposed to characterize the impaction of pulse energy and defocusing amount on weld penetration.The results show that weld penetration increases with the increasing of the modified power density.In addition, it is concluded that lower modified power density and slower welding rate or higher modified power density and faster welding rate should be used on the pulse laser welding of the membrane isolation valve.The membrane isolation valves produced by the process parameters based on the orthogonal test can satisfy the designing requirements on quality of welded joint, sealing property and the stability of rupture pressure.Currently, the products have been used in a variety of flight products, and passed the tests and flight assessments.

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