Trhe 6082-T6 aluminum alloys butt-joints of different times of repair,which is used for high-speed train,were studied respectively through pulsating tensile fatigue test and scanning analysis for the fatigue fractures. The results showed that ：the welding joints median value fatigue limit strength that specifies life of 1 ×107 increased with the increase of repair times. When the friction stir welding was repaired two times,the fatigue limit strength of welded joint was higher,the fracture location of the FSW specimen was mainly concentrated on the edge of the back surface welding seams. The scanning photos showed that the panorama of the fracture was like fibrous;the fatigue beach on the crack initiation zone and extending zone was vivid ;the final broken zone was the toughness fracture of low dimple type.
Electric Welding Machine
friction stir welding