The joint properties of copper by friction stir welding

Lee, Wonbae; Jung, Seung‐Boo

doi:10.1016/j.matlet.2003.08.014

Cited by 253 publications

(155 citation statements)

References 7 publications

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“…This instability of hardness from top to bottom of the weld nugget can be imputed to variation in grain size, strain hardening effects, the fraction of copper at the top region is higher than that of other areas and due to intermetallic compounds. Similar kind of results was also reported by Won-Bae Lee [23] during welding of copper plates. The material closest to the tool shoulder undergoes greater plastic deformation as compared to material that is away from the tool, thus leading to refine grain structure.…”

Section: Microhardness Variation Across the Weldsupporting

confidence: 88%

Friction Stir Welds of Al Alloy-Cu: An Investigation on Effect of Plunge Depth

Wahid¹,

Siddiquee²,

Khan³

et al. 2016

Archive of Mechanical Engineering

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In the present study, butt joints of aluminum (Al) 8011-H18 and pure copper (Cu) were produced by friction stir welding (FSW) and the effect of plunge depth on surface morphology, microstructure and mechanical properties were investigated. The welds were produced by varying the plunge depth in a range from 0.1 mm to 0.25 mm. The defect-free joints were obtained when the Cu plate was fixed at the advancing side. It was found that less plunging depth gives better tensile properties compare to higher plunging depth because at higher plunging depth local thinning occurs at the welded region. Good tensile properties were achieved at plunge depth of 0.2 mm and the tensile strength was found to be higher than the strength of the Al (weaker of the two base metals). Microstructure study revealed that the metal close to copper side in the Nugget Zone (NZ) possessed lamellar alternating structure. However, mixed structure of Cu and Al existed in the aluminum side of NZ. Higher microhardness values were witnessed at the joint interfaces resulting from plastic deformation and the presence of intermetallics.

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Section: Microhardness Variation Across the Weldsupporting

confidence: 88%

Friction Stir Welds of Al Alloy-Cu: An Investigation on Effect of Plunge Depth

Wahid¹,

Siddiquee²,

Khan³

et al. 2016

Archive of Mechanical Engineering

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“…[6][7][8] This is attributed to the high melting point and good thermal conductibility of pure copper, which requires a higher heat input during FSW to achieve a defect-free weld. Compared to pure copper, dual-phase brass contains a great amount of 0 (CuZn compound) phase that exhibits higher hardness and poorer deformation ability than phase.…”

Section: Introductionmentioning

confidence: 99%

Effects of Friction Stir Welding Parameters on Microstructures and Mechanical Properties of Brass Joints

Xie

2008

Mater. Trans.

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5 mm thick brass plates were successfully friction stir welded at the tool rotation rates from 400 to 1000 rpm for a constant traverse speed of 100 mm/min. The nugget zone (NZ) consisted of the incompletely and completely-recrystallized regions. With increasing rotation rates, the fraction of the non-recrystallized grains decreased and the size of the recrystallized grains increased. The hardness values in the NZs were higher than those in the parent material (PM). Increasing the rotation rate did not exert a noticeable effect on the tensile and yield strengths of the welds, but increased the elongation. The tensile and yield strengths of the welds reached up to $99 and 80% of the PM, respectively. The fracture occurred in the heat affected zone that had the lowest hardness.

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“…The hardness of the base metal is 96HV and 120 HV. The hardness of the nugget zone is influenced by annealing softening and grain refinement in pure metals [16]. The average hardness of weld zone is found to be significantly lower than that of the hardness of the base metal.…”

Section: IIImentioning

confidence: 93%