METHOD FOR IMPROVING HIGH FREQUENCY INDUCTION HEATING RESIDUAL STRESS, AND HIGH FREQUENCY INDUCTION COIL

摘要

PROBLEM TO BE SOLVED: To control a residual stress at a boundary between a weld metal part and a base metal part to≤0 MPa.

SOLUTION: In the method for improving the high frequency induction heating residual stress, by which a high frequency induction coil is arranged on an outer circumference of a weld joint part of an austenitic stainless steel pipe around the joint part with a predetermined width, and the joint part is heated by allowing the high frequency current to flow through the high frequency induction coil while passing cooling water in the pipe, a predetermined temperature difference is imparted to inner and outer surfaces of the pipe, and a predetermined coil width is set, thereby performing the high frequency induction heating.

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