Blind hole method post-welding residual stress test drilling device and working method thereof

The invention relates to a blind hole method post-welding residual stress test drilling device and a working method thereof, and the drilling device comprises two first supports (2) which are arranged at intervals along a first direction (x); two of the four supporting legs (1) are arranged at the two ends of one first support (2) in the second direction (y) respectively, the other two supporting legs (1) are arranged at the two ends of the other first support (2) in the second direction (y) respectively, the four supporting legs (1) are located on the same side of the first supports (2) in the third direction (z), and the second direction (y) is perpendicular to the first direction (x). The third direction (z) is perpendicular to the first direction (x) and the second direction (y), the supporting legs (1) are telescopic, and the free ends of the supporting legs (1) are provided with suction pieces (11); the second bracket (3) is connected between the two first brackets (2); and the drill bit (5) is mounted