SHI Suxia, ZUO Mou, LIU Xueli, et al.Vacuum brazing technology of seal ring composed of martensitic stainless steel and aluminum bronze[J].Electric Welding Machine, 2022, 52(01): 103-108. DOI： 10.7512/j.issn.1001-2303.2022.01.13.
Vacuum Brazing Technology of Seal Ring Composed of Martensitic Stainless Steel and Aluminum Bronze
The sealing ring structure of an aero engine is connected by the mounting edge of material 1Cr17Ni2 and the ring of material QAL7 through vacuum brazing. After the aero engine test run, the qualified brazing seam processed by the original process appeared the phenomenon of brazing crack, which seriously restricted the development progress. In this paper, vacuum brazing technology of sealing ring is improved by using simulated parts, and HBAg72CuNiLi eutectic filler metal is used. The brazing gap is adjusted to 0.18~0.20 mm at room temperature, the brazing gap is ensured by turning the external diameter of bronze ring according to the size of the mounting edge, and the weld cracking during brazing is prevented from increasing the brazing equipment. The results show that the brazing seam has uniform surface, smooth transition and no defects, which meets the quality requirements. The water immersion ultrasonic testing is used instead of X-ray inspection to detect the brazing seam, and the detection results are consistent with the metallographic detection results. The parts brazed by the new technology pass the test run and the problem of cracking of brazing seam is solved.
seal ringvacuum brazingbrazing gapultrasonic testing in water immersion
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