|Table of Contents|

Process of TLP welding of stainless steel injector in orbit-control engine(PDF)

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

Issue:
2021年01期
Page:
90-96
Research Field:
工艺与材料
Publishing date:

Info

Title:
Process of TLP welding of stainless steel injector in orbit-control engine
Author(s):
SONG Fan1; ZHOU Jie2; XU Xiaodan2; LI Sibei2; CHEN Haiwei2
(1.Shanghai Institute of Space Propusion,Shanghai 201112,China; 2. Shanghai Engineering Research Center of Space Engine,Shanghai 201112,China)
Keywords:
injector;  TLP welding;  process;  Nickel-base solder;  intermediate layer
PACS:
TG456.7
DOI:
-
Abstract:
In order to develop the injector for the new orbit-control engine, the process of TLP welding of the stainless steel ring groove multilayer board was studied. With the increase of welding temperature and holding time, the diffusion of elements gradually deepens. When the diffusion is incomplete, the weld is composed of the solid solution in the edge and the compound in the middle. When the diffusion is complete, the weld is entirely composed of the solid solution. The Ni, Si and B gradually decrease, while the Fe gradually increases in the weld. The diffusion rate of Ni, Fe and B is faster, while the rate of Si is slower. The content of Si and B determines the structure, and the content of Ni affects the tensile properties. The tensile properties increase with the degree of diffusion, and the performance of the best joint can reach 101% of the base material. The fracture morphology changed from intergranular complete brittle fracture to partial plastic fracture of small tough dimples, and finally showed complete plastic fracture of larger tough dimples. For the B-Ni2 intermediate layer with a thickness of 40 μm, the optimal welding temperature, holding time and loading pressure are 1 050～1 075 ℃, 2 h and 0.01～0.02 MPa, respectively. The best parameters have been successfully applied to simulation parts and products, and a new welded orbit-control engine has passed the test.

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Last Update: 2021-02-20