This paper aims at the determination of eigen value of 2024 aluminium friction stir welding（FSW） joint. By collecting data on the geometry of the 2024 aluminum alloy Ldirection friction stir welding joint under different welding parameters. The sensitivity of joint microstructure information to welding parameter was calculated by the correlation analysis.The eigen value of 2024 FSW joint was determined by further correlation analysis between joint microstructure information and property of welded joint. An example was given to illustrate the criterion of joint eigen value to joint performance.
friction stir weldingrelativityjoint eigen valueweld joint property