| 摘要 |
<p> The purpose of the present invention is to provide a method and an apparatus for performing a heat treatment allowing tensile residual stress to be reduced in a welded portion, and tensile residual stress generated in a parent material portion to be reduced. In order to solve the above problem, the present invention is characterized in that a heating device is installed in each of a first region and a second region; the first region being a welded portion of a welded structure, and the second region being a parent material portion; the first region is heated to a first temperature and the second region is heated to a second temperature that is lower than the first temperature; the first and second temperatures are held for a certain period of time; and the first and second region in the welded structure are then cooled.</p> |
