A Study on the Fracture Toughness Characteristics of FCAW Weldment of Steel for Offshore Structures

Kang, Sung-Won; Kim, Myung-Hyun; Kim, Yong-Bin; Shin, Yong-Taek; Lee, Hae-Woo

Journal of KWJS 2004;22(6):57-63.
Published online January 26, 2005.

[연구논문] 해양 구조물용 강재 FCAW 용접부의 파괴인성 특성에 관한 연구

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A Study on the Fracture Toughness Characteristics of FCAW Weldment of Steel for Offshore Structures

Sung-Won Kang, Myung-Hyun Kim, Yong-Bin Kim, Yong-Taek Shin, Hae-Woo Lee

Abstract

Fracture toughness is an important parameter in designing offshore structures to ensure resistance to fracture at various temperatures. in this study, a series of experiments is carried out to obtain fracture toughness values (CTOD) of API 2W Gr.50B, welded using FCAW(Flux Cored Arc Weld). In particular, a comparison of absorbed impact energy and CTOD values are made with respect to two different welding groove shapes; double- V-groove and double-bevel-groove. Charpy impact tests are performed for specimens sampled near the root gap, and CTOD tests are carried out for three point bending specimens having the notch at weld zone. While Charpy impact test result is determined to be a good qualitative measure of fracture toughness, no quantitative correspondence between impact absorbed energy and CTOD values was found. Based on the experiment, it is observed that double- V-groove welds give lower transition temperature than those of double-bevel-groove.