| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic peening device and a magnetic peening method in which stress corrosion cracking (SCC) is prevented from occurring by improving a stress condition of an inner surface of a pipe made of a nonmagnetic material.SOLUTION: The magnetic peening device 10 includes a steel ball 20 provided inside the pipe 1 of the nonmagnetic material, electromagnets 11 arranged around the outer periphery of the pipe 1, generating a magnetic force with power supply and attracting the steel ball 20 to hit a position on an inner surface of the pipe 1 corresponding to a position of a powered electromagnet with the steel ball 20, a power source 12 for supplying power to the electromagnet when electrically connected with the electromagnet, a relay switch 13 for switching electrical connection between the each electromagnet and the power source 12, a control unit 14 for controlling the relay switch 13 to electrically connect the power source 12 with part of the electromagnets 11, and switching the electromagnet to be electrically connected with the power source 12 in prescribed order. The control unit 14 controls the relay switch 13 to switch the electromagnet to be powered in the prescribed order, which moves the position hit with the steel ball 20 on the inner surface of the pipe 1. |
