Weld repair practices without post weld heat treatment for ferritic alloys and their consequences on residual stresses: A review

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

“…From the data of Table 4 and Fig. 9 highlights the inter-relation between the angle˛and the radius at the weld toe, which are recognized as the most important factors for the fatigue strength of welded joints, as described by Lancaster (1993) and Aloraier et al (2010). That is: the smaller the angle˛and the radius of the weld toe notch, the smaller is the fatigue strength (higher K t ).…”

“…According to Aloraier et al (2010), the weld toe cracking is caused by the weld metal that has higher yield strength and tensile strength than the parent metal (weld strength overmatch). These authors commented that "when the weld area shrinks on cooling from the welding temperature, cracking occurs in the heat-affected zone (HAZ) of the steel because the yield and strength levels of the HAZ are lower than those of the weld metal".…”

“…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).…”

Temper Bead Welding of S420G2+M Steel in Water Environment

“…Research is being conducted on the use of preheating by induction method, however, it has not found yet widespread use [20]. One of the ways to reduce the tendency to the formation of cold cracks having practical application is Temper Bead Welding (TBW) technique [1,[21][22][23][24].…”

“…In the case of implementation of TBW technique for preventing from formation of cold cracking it is important to determine a time interval between instants of overlaying a tempered bead and tempering one. Depending on a type of applied electrode the time up to crack forming at wet welding may reach from 3 min to 2 hours [1,24,25]. Successive parameters important from the point of view of effectiveness of the process are: value of heat input in every bead as well as distance between beads axes (pitch).…”