Study of 7075 Aluminium Alloy Joints

Peter, Ildiko; Rosso, Mario

doi:10.1515/bsmm-2017-0011

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…The cracks propagate on grain boundaries, along the bands created by cold working in the direction of rolling the sheet material. As was indicated in [23,24], there is also high risk of hot cracking in HAZ during arc welding by the MIG-Puls method. Occurrence of the cracks is a consequence of improperly selected welding parameters, resulting in introducing too much heat to the joint (high linear energy).…”

Section: Microstructure Of Welded Jointsmentioning

confidence: 83%

Archives of Metallurgy and Materials

Wojdat,

Kustroń,

Jaśkiewicz

et al. 2019

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In the paper, verification of welding process parameters of overlap joints of aluminium alloys EN AW-6082 and EN AW-7075, determined on the grounds of a numerical FEM model and a mathematical model, is presented. A model was prepared in order to determine the range of process parameters, for that the risk of hot crack occurrence during welding the material with limited weldability (EN AW-7075) would be minimum and the joints will meet the quality criteria. Results of metallographic and mechanical examinations of overlap welded joints are presented. Indicated are different destruction mechanisms of overlap and butt joints, as well as significant differences in their tensile strength: 110 to 135 MPa for overlap joints and 258 MPa on average for butt joints.

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Section: Microstructure Of Welded Jointsmentioning

confidence: 83%

Archives of Metallurgy and Materials

Wojdat,

Kustroń,

Jaśkiewicz

et al. 2019

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“…The difference is in the hardness of the weld, the average hardness which is 94 HV 0.05. The results are presented in [ 8 ], where the HAZ hardness in the EN AW-7075 alloy is in the range of 110–120 HV. A significant difference occurs in the base material, in which it is in the range of 180–190 HV and results from a different degree of hardening of the EN AW-7075 alloy.…”

Section: Resultsmentioning

confidence: 99%

“…A significant difference occurs in the base material, in which it is in the range of 180–190 HV and results from a different degree of hardening of the EN AW-7075 alloy. In these tests, the EN AW-7075 alloy was welded in the T4 hardened state, and in [ 8 ] the T6 hardened state.…”

Section: Resultsmentioning

confidence: 99%

“…These methods are carried out with high linear energy, which affects the relatively high degree of mixing of metals, thus increasing the risk of hot cracks. Moreover, the high-energy course of the process causes the formation of a dendritic structure in HAZ, which leads to a significant reduction in the mechanical properties and corrosion resistance of these alloys [ 8 ]. Modern methods of laser beam welding or hybrid laser/gas metal arc (GMA) welding also have a significant limitation in this case.…”

Section: Introductionmentioning

confidence: 99%

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Study of Corrosion, Structural, and Mechanical Properties of EN AW-6082 and EN AW-7075 Welded Joints

et al. 2021

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The purpose of the work was to test the welded joints of aluminum alloys EN AW-7075 and EN AW-6082, which are used to join individual structural elements of car bodies, e.g., B-pillar with the body. The joints were made using the low-energy cold metal transfer (CMT) arc welding method. The results of the structure investigations of lap and butt joints, as well as tests of mechanical properties are presented. The influence of linear energy and the way of arranging materials in lap joints on the possibility of hot cracks occurrence has been demonstrated. The shear strength of lap joints was equal to 150 MPa, while the tensile strength of butt joints was equal to 375 MPa. The highest hardness reduction was observed in the heat affected zone (HAZ) from the EN AW-7075 alloy side in the range of 98 to 138 HV 0.05. In addition, a significant reduction of the corrosion resistance in the transition zone between HAZ and the base material (EN AW-7075 alloy) in the medium salinity environment, corresponding to the sea conditions according to ASTM G85 was indicated.

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“…Additive manufacturing (AM) has become an attractive approach for fabricating and repairing aerospace components [3], in part, due to the benefit in reducing production costs associated with build time and waste material of traditional manufacturing methods [4]. However, for fusion-based AM processes (e.g., selective laser melting and electron-beam melting), certain alloys suffer from poor weldability [5][6][7][8], which inhibit the additive fabrication or repair. One such alloy system is Al-Zn-Mg-Cu aluminum alloys, in particular AA7075, which exhibit hot cracking and porosity defects via fusion-based AM methods [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Repaired via Additive Friction Stir Deposition

Avery

Cleek

Phillips

et al. 2022

Journal of Engineering Materials and Technology

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A novel solid-state additive manufacturing (AM) process, additive friction stir deposition (AFS-D), provides a new pathway for additively repairing damaged nonweldable aerospace materials that are susceptible to induced thermal gradients within the microstructure. In this work, we quantify the microstructural evolution and mechanical performance of an additively repaired AA7075-T651 (Al-Zn-Mg-Cu) via the AFS-D process. To evaluate the AFS-D process for repairing high strength aluminum alloys, the AFS-D technique was used to additively fill a linear groove that was machined into an AA7075-T651 plate. After repairing the plate with the AFS-D process, the repaired plate was subjected to standard T6 heat treatment. The results of this study show that the heat-treated AFS-D repair did not exhibit any significant grain growth and demonstrated an increase in the average Vickers hardness in the repair compared with the wrought 7075-T651 control. Tensile and fatigue behavior was investigated for heat-treated repair and compared with the wrought AA7075-T651 control. The heat-treated repair exhibited wrought-like tensile properties for yield stress (YS) and ultimate stress; however, the heat-treated repair had significant scatter in the elongation to failure. Additionally, the mean fatigue behavior of the heat-treated repairs displayed a reduction in cycles to failure compared with the wrought control. Lastly, a microstructure-sensitive fatigue life model was used to elucidate process-structure-property fatigue mechanism relations of the heat-treated repair and wrought AA7075.

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Study of 7075 Aluminium Alloy Joints

Abstract: Abstract.

Cited by 10 publications

References 17 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Study of Corrosion, Structural, and Mechanical Properties of EN AW-6082 and EN AW-7075 Welded Joints

Evaluation of Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Repaired via Additive Friction Stir Deposition

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