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연속압입시험에 의한 발전소용 배관의 용접잔류응력 평가에 관한 연구
박상기(S.K. Park),최원두(W.D. Choi),길두송(D.S. Gil),고준빈(J.B. Ko),이규천(K.C. Lee),이영호(Y.H. Lee) 한국동력기계공학회 2004 동력시스템공학회지 Vol.8 No.2
In this study, to verify the reliability of the indentation for measuring welding residual stresses to get in method we compared the results of the method with those measured by the saw cutting method. Also for the same purpose we used a 4-point bending test and confirmed the reliability of indentation method. The specimens used in this experiment are made with the same conditions for hot reheater pipes and cold reheater pipes used in the electric power plant. Therefore we could know that the results of the methods showed the reliability of the method to obtain welding residual stresses.
李暎浩,李揆千 충남대학교 공업교육연구소 1986 論文集 Vol.9 No.1
In this study, the effect of Ni-content in flux of CO₂shielded flux cored arc welding on toughness of weldment is investigated. 1) The content of acicular ferrite in weld metal increases with increasing No-content in flux and its shape is sharpened. 2) Tensile strength, yield strength, hardness, elongation of weld metal increases with increasing Ni-content in flux. 3) Improvement of mechanical properties is caused by refining of grain size and increasing of acicular ferrite.