| 摘要 |
<p>PURPOSE:To enable to improve the reliability against fracture by a method wherein a weld zone is constituted by two or more kinds of welding metals, the thermal expansion coefficients of which are different from each other, and the joining is performed by applying stress relief annealing treatment to the weld zone. CONSTITUTION:A welded joint consisting of austenitic stainless steel welding metal 10, the thermal expansion coefficient of which is larger, and martensitic stainless steel welding metals 11 and 12, the thermal expansion coefficient of which is smaller, is treated by stress relief annealing at or just below the temperature, at which the alpha gamma transformation of steel occurs, after welded. As a result, compression stress remains exceptionally on the surface of the weld metal of the first martensitic stainless steel welding metals 11 and 12, resulting in improving the reliability against fracture.</p> |
