다층 FCA 용접에 의한 극 후판 버트 접합부의 잔류응력 해석 연구

초록

Some structural members of large-scale marine vessels such as large-scale offshore structures and very large container ships are assembled by very thick plates whose thickness exceeds 60mm. Also, high-tensile steel has been selected to meet the required structural strength. Generally, multi-path welding method such as FCA(Flux-Core Arc) welding has been used to join the thick plates. Considering the welding residual stresses, fatigue strength of the welded joints of thick plates should be assured since the residual stress influences the fatigue strength. This paper suggests a computational model to predict the residual stress in welded parts joined by FCA welding. The residual stress distribution is measured by X-Ray diffraction method. Also, the residual stress obtained by the computational model has been compared with that of experiment.