By W. Sudnik
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Extra info for Arc Welding
H. Benseddiq, N. (2010). Fatigue crack growth under a constant amplitude loading of Al-6061-T6 welds obtained by modified indirect electric arc technique. Science and Technology of Welding and Joining, Vol. 15, Issue 6, (Aug 2010), pp. H. (2009). A comparative study of the mechanical properties of 6061-T6 GMA welds obtained by the indirect electric arc (IEA) and the modified indirect electric arc (MIEA). Materials and Design, Vol. 30, pp. 2446-2453. ; Velay, V. Lours, P. (2009). A microstructural and lowcycle fatigue investigation of weld-repaired heat-resistant cast steels.
8. , 2007). With the features of the IEA process, a better SSC resistance at 25 °C was obtained in comparison to the SAW and MIG processes. For specimens obtained by the IEA process subjected to SSR tests, the failure occurred on the base metal and for specimens produced by SAW and MIG processes it occurred in the weld bead and HAZ respectively. At 37 °C and 50 °C, the SCC resistance of all processes show a similar behaviour (failed in the base metal). The higher atomic hydrogen permeation flux presented by the IEA process was promoted by the ferrite phase from the base metal, which is comparable to the fracture which occurred from SSRT.
Also, at the limit between the HAZ and the base metal, it is noted the presence of a soft zone which is formed nearly symmetrically in both sides of the welded joints. It should be note that the hardness obtained in this zone represents roughly 57 % of the hardness number of the base material. This seems to indicate that the tensile mechanical properties after welding process will be greatly different. 14b visualizes the location of the soft zone highlighted by the Vickers hardness profile represented in Fig.