TY - GEN
T1 - Microstructure, mechanical properties and SSC susceptibility of multiple smaw repairs in line pipe girth welds
AU - Vega, Oscar E.
AU - Hallen, José M.
AU - Villagomez, Agustin
AU - Contreras, Antonio
PY - 2009
Y1 - 2009
N2 - Girth welds of seamless API X52 steel pipe containing multiple shielded metal arc welding (SMAW) repairs and one as-welded condition were studied. Microstructural characterization, mechanical behavior and sulfide stress corrosion cracking (SSC) susceptibility of the welded joints were evaluated by means of optical and scanning electron microscopy, hardness, tension, Charpy-V impact resistance and slow strain rate tests (SSRT). The results of this work indicate that increasing the number of welding repairs promotes grain growth in the heat affected zone (HAZ). The yield strength (YS) and ultimate tensile strength (UTS) for the different welding repairs satisfy the specified minimum values of the material. Significant reduction in Charpy-V impact resistance with the increases of the number of repairs was found in the coarse grained heat affected zone (CGHAZ). A high susceptibility to SSC was exhibited by the welded joints and the intercritical heat affected zone was the most susceptible area to SSC.
AB - Girth welds of seamless API X52 steel pipe containing multiple shielded metal arc welding (SMAW) repairs and one as-welded condition were studied. Microstructural characterization, mechanical behavior and sulfide stress corrosion cracking (SSC) susceptibility of the welded joints were evaluated by means of optical and scanning electron microscopy, hardness, tension, Charpy-V impact resistance and slow strain rate tests (SSRT). The results of this work indicate that increasing the number of welding repairs promotes grain growth in the heat affected zone (HAZ). The yield strength (YS) and ultimate tensile strength (UTS) for the different welding repairs satisfy the specified minimum values of the material. Significant reduction in Charpy-V impact resistance with the increases of the number of repairs was found in the coarse grained heat affected zone (CGHAZ). A high susceptibility to SSC was exhibited by the welded joints and the intercritical heat affected zone was the most susceptible area to SSC.
UR - http://www.scopus.com/inward/record.url?scp=70350070192&partnerID=8YFLogxK
U2 - 10.1115/IPC2008-64187
DO - 10.1115/IPC2008-64187
M3 - Contribución a la conferencia
AN - SCOPUS:70350070192
SN - 9780791848593
T3 - Proceedings of the Biennial International Pipeline Conference, IPC
SP - 127
EP - 132
BT - 2008 Proceedings of the ASME International Pipeline Conference, IPC 2008
T2 - 2008 ASME International Pipeline Conference, IPC 2008
Y2 - 29 September 2008 through 3 October 2008
ER -