Improvement of weldability and fracture behavior of mild steel and A7075 aluminum alloy dissimilar friction stir welded joints by increasing welding speed

Saleh, Mohamed; Morisada, Yoshiaki; Ushioda, Kohsaku; Fujii, Hidetoshi

doi:10.1016/j.mtcomm.2023.107372

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Because of their excellent comprehensive mechanical properties, 7xxx series aluminum alloys are widely used in the field of special vehicles and ships [ 1 , 2 , 3 , 4 , 5 , 6 ]. However, these alloys are prone to failures such as corrosion and shallow cracking during long-term employment; when repaired with traditional fusion welding methods, defects such as thermal cracks, pores, and inclusions are generated universally [ 7 , 8 , 9 , 10 ], leading to poor post-repair performance, which cannot meet the demands of applications. Therefore, research has been devoted to the realization of these alloys’ excellent repair properties.…”

Section: Introductionmentioning

confidence: 99%

“…The friction stir welding (FSW) principle can achieve superior weld morphology and mechanical properties and is widely used in aluminum alloy welding due to its high efficiency, simple operation, and absence of porosity and cracks [ 2 , 3 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. For example, Huang [ 1 ] and Feng et al [ 15 ] obtained excellent mechanical properties of the joints with the friction stir welding of 7A52 aluminum alloys, although there was a pin-hole defect at the end of the welding channel.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of 7A52 Aluminum Alloy Thin Sheet Repaired with Friction Stir Surfacing

Li,

Shi,

Han

et al. 2024

Materials

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A solid-state repair technique based on surface friction welding is investigated in depth to achieve excellent mechanical properties of damaged 7A52 aluminum alloy. The results show that the yield strength and tensile strength along the repair direction are 436 MPa and 502 MPa, respectively, at a rotational speed of 1400 rpm and a travel speed of 300 mm/min, which are about 157.9% and 129.7% of those before the defects were repaired, respectively, while the elongation is 17.2% compared to the base material. Perpendicular to the repair direction, the yield strength and tensile strength are 254 MPa and 432 MPa, which are 111.4% and 129.7% of those before the defects were repaired, respectively, while the elongation is 11.8% compared to the base material. The mechanical properties of the repaired areas are still improved compared to those of the defect-free sheets. On the one hand, this is attributed to the dynamic recrystallization of the nugget zone due to the thermo-mechanical coupling, resulting in the formation of a fine, equiaxed grain structure; on the other hand, the precipitated Mg2Si phase, which is incoherent within the base material, transforms into the Al12(Fe, Mn)3Si phase, as well as the precipitation of the Al6Mn phase and η′ phase, resulting in the enhancement of the properties. The material fracture at the junction of the nugget zone and the heat-affected zone occurs after repair, which is attributed to the significant difference in the texture of the nugget zone and the heat-affected zone, as well as to the stress concentration at the junction.

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