Abstract

We compared the fatigue characteristics of weld metal with those of base metal, and not heat-treated with heat-treated. Also, we examined the influence of bead in a viewpoint of fatigue life.
From the experimental results, it has been seen that the fatigue characteristics of welded specimens grinded the toe of bead are slightly better than not grinded. We have seen that the fatigue life is affected more by the stress concentration on the profile change in the weld toe rather than by residual stress influence, because heat-treated or not had almost no influence on the fatigue characteristics.

• Keywords: Fatigue(피로),S-N curve(S-N 선도),Base metal(모재),Weld toe(용접지단부),Stress concentration factor(응력집중계수),Weld bead profile(용접비드 형상)