극후판 EH40 TMCP강재 Tandem EGW 용접부의 잔류응력 해석

• Published in: 大韓造船學會 論文集 Vol. 47; no. 6; pp. 821 - 830
• Main Authors: 황세윤(Se Yun Hwang), 이장현(Jang Hyun Lee), 김병종(Byung Jong Kim), 양용식(Yong Sik Yang)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2010
• Subjects: 조선공학; Tandem EGW; 3D Thermal Elasto-Plastic analysis(3차원 열탄소성 해석); EH40; Welding Residual Stress(용접 잔류 응력); 3
• ISSN: 1225-1143; 2287-7355

Deck plates and hatch coming of large container carrier and offshore structures are joined by ultra-thick plates whose thickness is more than 60mm. Traditionally FCAW has been used to join the thick plates in butt joint. However, FCAW has been replaced with EGW since the welding efficiency of EGW is higher than that of FCAW. Tandem EGW using two electrodes has been applied to vertical position welding by several shipyards. EGW requires one or two layers of bead whereas FCAW requires more than 20 layers of weld bead in thick welding. However, high welding residual stresses are generated by EGW since it uses higher heat input than FCAW. In the present study, a finite element model is suggested to predict the residual stresses induced by the tandem EGW. Butt specimen of EH40 TMCP shipbuilding steel plates vertical welding was modeled by a three-dimensional model. Residual stresses were measured by X-ray diffraction method and to verify the numerical result. The results show a good agreement with experimental result.