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The Welding Residual Stress and Fracture Toughness Characteristics of HT50 Laser Welded Joint  

Ro, Chan-Seung (Graduate School, Dept. of Naval Architecture & Ocean Eng., Chosun Univ.)
Bang, Hee-Seon (Division of Aerospace and Naval Architecture Eng., Chosun Univ.)
Bang, Han-Sur (Division of Aerospace and Naval Architecture Eng., Chosun Univ.)
Oh, Chong-In (Graduate School, Dept. of Naval Architecture & Ocean Eng., Chosun Univ.)
Publication Information
Journal of Ocean Engineering and Technology / v.21, no.3, 2007 , pp. 71-76 More about this Journal
Abstract
Recently, many industries have been employing the application of laser beam welding, due to the resulting high welding quality, such as smaller width of melting and heat affective zone, smaller welding deformation, and fine grains of weldment, compared to arc welding. However, in order to appropriately utilize this welding process with steel structure, the characteristics of welding residual stresses and fracture toughness in welded joints are to be investigated for reliability. Therefore, in this study, the mechanical properties of weldments by arc and laser welding are investigated using FEM to confirm the weldability of laser welding to the general structural steel (HT50). The Charpy impact test and 3-points bending CTOD test are carried out in the range of temperatures between $-60^{\circ}C\;and\;20^{\circ}C$, in order to understand the effect on the fracture toughness of weldments. From the research results, it has been found that the maximum residual stress appears at the center of plate thickness, and that the fracture toughness is influenced by strength mis-match.
Keywords
Laser beam welding; Crack tip opening displacement(CTOD); Charpy absorbed energy; Fracture toughness; Fracture pass deviation(FPD);
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