Life prediction of repaired welds in a pressurised CrMoV pipe with incorporation of initial damage

Some key effects on the failure assessment of weld repairs in CrMoV pipelines using continuum damage modelling

“…Details of relevant studies can be found elsewhere [6,[13][14][15][16][17]. In all cases, the welds and repaired welds are assumed to be post weld heat treated and the residual stresses, which will be low, are not considered here.…”

“…It was found that at failure, high damage occurs in the HAZ in both of the original and repaired welds, and the peak damage occurs in the type IV region when additional axial (system) load is high. In the damage modelling with initial damage, the virgin properties were used for the original (unrepaired) welds, and all the repair related HAZ and weld metal were assumed to have the same properties as those for the original weld [15,16]. The variations of the life ratio, t T f =t fo , where t T f ð¼ t rep þ t rep f Þ is the total life, and t rep f is the failure life after repair, versus t rep /t fo , as a function of weld width, w 1 , for a full repair under a closed-end case, are shown in Fig.…”

Fatigue strength of tungsten inert gas-repaired weld joints in airplane critical structures

“…Moreover, the great majority of them are about aged and degenerated metals in petrochemical and offshore industries and power plants (viz., Aloraier et al, 2010;Branza et al, 2009;Vega et al, 2008;Mirzaee-Sisan et al, 2007;Edwards et al, 2005;Lant et al, 2001). Additionally, most of the carried out studies are based on simulation by finite element method -FEM -(e.g., Sharples et al, 2005;Sun et al, 2005;Dong et al, 2005;Aloraier et al, 2004;Hyde et al, 2004). Consequently, there are only few studies about multiple repair welding operations (e.g., Vega et al, 2008).…”

Effects of several TIG weld repairs on the axial fatigue strength of AISI 4130 aeronautical steel‐welded joints

“…Although the efforts made to improve the weld repair techniques for degraded and defective components have been extensive over the last decade, few papers approaching this subject have been published, the great majority on aged and degenerated materials in petrochemical, offshore and power industries 12 , 17–21 . Yet, most of these studies are based on simulation by finite element 15,22–25 and only few studies approach multiple repairs 19 …”

“…Although the efforts made to improve the weld repair techniques for degraded and defective components have been extensive over the last decade, few papers approaching this subject have been published, the great majority on aged and degenerated materials in petrochemical, offshore and power industries. 12,[17][18][19][20][21] Yet, most of these studies are based on simulation by finite element 15,[22][23][24][25] and only few studies approach multiple repairs. 19 Particularly for the transport sector, because welding repairs are an essential, widely and frequently used process, 26 the availability of experimental data about the welding repair effects on structural integrity of aircrafts may be very useful to determine inspection intervals on high-responsibility/critical to the flight-safety-welded structures.…”