용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가 - 제3보: 잔류응력과 초음파 파라미터

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 22; no. 6; pp. 27 - 34
• Main Authors: 안석환, 최문오, 정정환, 김성광, 남기우, Ahn, Seok-Hwan, Choi, Moon-Oh, Jeong, Jeong-Hwan, Kim, Sung-Kwang, Nam, Ki-Woo
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 01.12.2008
• Subjects: 해양공학; X
• ISSN: 1225-0767; 2287-6715

The temperature distribution in the weldment is not uniform because a weldment is locally heated. Thermal plastic deformation results from the local expansion and shrinkage by the heating and cooling of metal. Therefore, residual stresses and distortion occur in the weldment. In this study, we had conducted on the weld thermal cycle simulation that is supposed as the HAZ on SS400 steel and STS304 steel. The residual stresses that were obtained from the drawing and the weld thermal cycle simulation were estimated by X-ray diffraction. We also carried out ultrasonic test for the weld thermal cycle simulated specimens, and then conducted on nondestructive evaluation by the ultrasonic parameters obtained ultrasonic test. From the results, residual stresses of weld thermal cycle simulated specimens after the residual stress removal heat treatment are lower than that of the drawing.