Effect of welding wires on fatigue property of 7N01-T4 aluminium alloy joints

Liu, Dashuang; Wei, Ping; Long, Weimin; Zhou, Wei; Wu, Mingyang; Wang, Jiayou

doi:10.1080/13621718.2020.1823655

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…The crack propagation follows a radial path and is generally observed in multi-pass welds. 31 The void size clearly confirms that the fatigue life was low, with cycles to failure less than 10 5 cycles. The crack propagation area was smaller and comparable with the specimens under a higher stress regime.…”

Section: Microstructural Examinationmentioning

confidence: 64%

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Microstructure and fatigue behaviour of spin-arc welded AISI C1018 low carbon steel

Parthiban

Kumar

Kannan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This work investigates the fatigue performance of 10 mm AISI C1018 low carbon steel plates welded with ER70S-6 using a gas metal arc welding-based spin-arc welding process. Welded joint microstructure is characterized by bainite, acicular ferrite, and allotriomorphic ferrite along with pearlite in the ferritic matrix. The tensile strength of the weld metal was comparable with base metal and meets the mechanical property requirements in accordance with the ASTM A311/A311M-04 (2020) standard. The fatigue strengths of base metal and weld metal are 121 and 126 MPa, respectively, after sustaining 106 cycles. During cyclic loading, fracture surfaces were distinctly noticed as the crack initiation, crack propagation, and final rupture regions. The decrease in alternating stress increased the fatigue cycles to final rupture, and the nature of fatigue fracture was ductile with dimples and voids.

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Section: Microstructural Examinationmentioning

confidence: 64%

“…These observations were in line with the previous works. 28,30,31 In addition, the existence of carbides acted as crack arrestors and enhanced the crack resistance. The residual stresses induced by thermal expansion during multi-pass welding and its subsequent contraction during solidification aided the fracture in the weld region.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and fatigue behaviour of spin-arc welded AISI C1018 low carbon steel

Parthiban

Kumar

Kannan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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show abstract

“…A soft, ductile solid solution phase and a hard, brittle eutectic micro-constituent in the PMZ resulted in a loss of strength and ductility of the joint compared to the base metal (BM). Liu et al [15] reported that the crack initiation during fatigue loading of 7N01-T4 welded using ER5356 filler metal occurred from PMZ. Moreover, Sharahi et al [16] reported the harmful effect of PMZ on joint strength/ductility in AZ91 alloy.…”

Section: Introductionmentioning

confidence: 99%

Liquation-induced loss of ductility in AA7075 aluminium alloy fusion welds

Pirjamadi

Alikhani

Movahedi

et al. 2023

Science and Technology of Welding and Joining

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This paper investigates the effect of liquation in the partially melted zone (PMZ) on the stress-strain behaviour of the AA7075 arc fusion welds. It is identified that the presence of micro-sized Cu-rich second phases in the initial microstructure of the AA7075 is responsible for constitutional liquation in the PMZ. Although the liquation cracking can be avoided using the proper selection of filler metal, it is demonstrated that the formation of brittle Al 2 Cu-type intermetallic-containing eutectic structure resulting from non-equilibrium solidification of the liquated grain boundaries can induce a severe loss of ductility in the PMZ. This calls for proper strategies to minimise the grain boundary liquid film thickness to produce a more reliable fusion weld on AA7075 alloy.

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“…This is attributed to refining the structure by adding Zr element to the formation of Al 3 Zr. Liu et al [ 9 ] found the porosity and the eutectic melting in the heat affected zone led to crack initiation for ER5087 and ER5356 welded joints during the fatigue process, respectively. However, there are few reports comparing the effect of ER5356 and ER5087 welding wires on the corrosion properties of 7N01 aluminum alloy joint.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Corrosion Behavior of MIG-Welded 7N01-T4 Aluminum Alloy by ER5356 and ER5087 Welding Wires

Wei

Liu

et al. 2022

Materials

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7N01-T4 aluminum alloy plates were welded by the metal inert gas (MIG) welding method, with ER5087 and ER5356 welding wires, respectively. The electrochemical corrosion behavior of the weld zones in the two kinds of welded joints using 3.5 wt.% and 5 wt.% NaCl solutions were investigated by polarization curve, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and laser confocal scanning microscope (LCSM). The results indicated the better corrosion resistance of the weld zone in the ER5356 welded joint than that in the ER5087 welded joint, which was related to the different contents of Mn and Zn elements and the distribution of precipitates for the weld zones in the two kinds of welded joints. Based on the LSCM of the weld zones, the maximum depth (dmax) of corrosion pits for the weld zone in the ER5356 welded joint was lower than that in the ER5087 welded joint when immersed in the same NaCl concentrations. The dmax of the corrosion pit of the weld zone in the ER5356 welded joint using the 5 wt.% NaCl solution was 78.5 ± 0.96 μm, which was much bigger than that using the 3.5 wt.% NaCl solution. For the weld zone in the ER5087 welded joint with 5 wt.% NaCl solution, more Cl- was adsorbed onto the active surface of weld zones, which accelerated the corrosion, resulting in the corrosion mechanism from pitting to intergranular corrosion.

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Effect of welding wires on fatigue property of 7N01-T4 aluminium alloy joints

Cited by 8 publications

References 14 publications

Microstructure and fatigue behaviour of spin-arc welded AISI C1018 low carbon steel

Microstructure and fatigue behaviour of spin-arc welded AISI C1018 low carbon steel

Liquation-induced loss of ductility in AA7075 aluminium alloy fusion welds

Electrochemical Corrosion Behavior of MIG-Welded 7N01-T4 Aluminum Alloy by ER5356 and ER5087 Welding Wires

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