Reliability study on airtightness testing methods in cast aluminum engine components
XIAO Peifa
LI Zhengxian
GUO Yongqiang
WANG Zhilei
WEI Hongling
Abstract：In order to enhance the reliability of airtightness testing for engine cast aluminum components and reduce the leakage failure rate during test runs,a test plan is designed to analyze the reliability of collaborative airtightness testing using water inspection and differential pressure testing methods,as well as high-temperature water inspection method.The results show that the initial pressure difference range for qualified cast aluminum parts is 336-354 Pa,and the retest pressure difference range is 260-281 Pa,with a significant difference.There are inconsistencies between the leakage results determined based on pressure difference and the observed results.The collaborative airtightness testing using water inspection and differential pressure testing methods had low reliability and is not suitable for airtightness testing of cast aluminum parts.As the water temperature increased,the leakage phenomenon of cast aluminum parts intensified,and new leakage points are identified,effectively improving the reliability of airtightness testing for cast aluminum parts.
Keywords：cast aluminum componentswater immersion methoddifferential pressure testing methodreliability
Publication Date：2026-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 56-61 )