Abstract
In order to investigate corrosion fatigue characteristics in weldment of multi-pass welded A106 Gr B steel pipe, corrosion fatigue tests were performed in the various stress frequencies and 3.5mass% NaCl solution at room temperature. And corrosion fatigue characteristic curves were represented by using crack closure concept. Obtained results are as follows; When load frequency is 1Hz, the crack opening point is transited in the region of K_<max> = 20 〜 32MPa√<m> . In the lower stress intensity factor range, the crack opening point is higher than that of air. But, in the higher stress intensity factor range, it was lower than that of air. And in the case of 0.1 Hz and 0.01 Hz, the crack opening point gradually decreased to K_<min> with K_<max> increase
