TY - GEN
T1 - Creep-fatigue properties for repair welded joint
AU - Nonaka, Isamu
AU - Kubushiro, Keiji
AU - Ito, Takuya
AU - Takagi, Yoshio
PY - 2006/11/29
Y1 - 2006/11/29
N2 - Repair welding has been performed when damage has been detected in aged power boiler piping. Discontinuity of deformation ability occurs between the new weld metal and degraded used material in the repair welded joint. Therefore creep-fatigue properties become important under displacement controlled piping system loading. Partial repair welded joint specimen and full repair weld joint specimen were made using the retired 2.25Cr-1Mo steel main steam header. In order to clarify the creep-fatigue properties for two kinds of repair welded joint specimens, fatigue tests under 0.7% strain range with 60min tensile strain dwell were performed at 600C. Both kinds of specimens were necked and fractured at the heat affected zone of welded joint due to the axial strain concentration and ratcheting at heat affected zone. The creep-fatigue life of partial repair weld joint specimen was about half of that of full repair weld joint specimen. This may be due to the low creep-fatigue resistance of the heat affected zone for partial repair welded joint specimen.
AB - Repair welding has been performed when damage has been detected in aged power boiler piping. Discontinuity of deformation ability occurs between the new weld metal and degraded used material in the repair welded joint. Therefore creep-fatigue properties become important under displacement controlled piping system loading. Partial repair welded joint specimen and full repair weld joint specimen were made using the retired 2.25Cr-1Mo steel main steam header. In order to clarify the creep-fatigue properties for two kinds of repair welded joint specimens, fatigue tests under 0.7% strain range with 60min tensile strain dwell were performed at 600C. Both kinds of specimens were necked and fractured at the heat affected zone of welded joint due to the axial strain concentration and ratcheting at heat affected zone. The creep-fatigue life of partial repair weld joint specimen was about half of that of full repair weld joint specimen. This may be due to the low creep-fatigue resistance of the heat affected zone for partial repair welded joint specimen.
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U2 - 10.1115/PVP2006-ICPVT-11-93550
DO - 10.1115/PVP2006-ICPVT-11-93550
M3 - Conference contribution
AN - SCOPUS:33751326607
SN - 0791837823
SN - 9780791837825
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - Proceedings of 2006 ASME Pressure Vessels and Piping Division Conference - ASME PVP2006/ICPVT-11 Conference - Pressure Vessel Technologies for the Global Community
T2 - ASME PVP2006/ICPVT-11 Conference
Y2 - 23 July 2006 through 27 July 2006
ER -