A characterization of microstructure and mechanical properties of A6N01S-T5 aluminum alloy hybrid fiber laser-MIG welded joint

Wang, Qiuying; Chen, Hui; Zhu, Zhiwu; Qiu, Peixian; Cui, Yunlong

doi:10.1007/s00170-015-8280-y

Cited by 27 publications

(15 citation statements)

References 24 publications

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“…The hardness in the HAZ is lower compared with base metal (120 HV) with the average difference of 27 HV. The lower hardness observed in the HAZ may attribute to the partial dissolution, over‐aging, and particle reprecipitation under complex welding thermal cycle . The sharp hardness gradient is generally regarded to be a locally serious stress concentration for a cracking site …”

Section: Resultsmentioning

confidence: 99%

“…It is seen from Figure A that the FZ is mainly composed of as‐cast structures. Melted metal crystallization primarily depends on the solute concentration ( C 0 ), solidification rate ( R 0 ), and temperature gradient ( G ) in the liquid phase . Lower G / R 0 value is responsible for equiaxed dendritic morphology in the central FZ and higher G / R 0 value for columnar crystal structure near the fusion line.…”

Section: Resultsmentioning

confidence: 99%

“…The generally accepted precipitation sequence for original AA7000‐series alloys is supersaturated solid solution α sss → Guinier‐Preston zone → metastable phase η′ → equilibrium phase η (MgZn 2 ) . Unfortunately, widely used traditional fusion welding procedures such as metal inert‐gas (MIG) arc welding and tungsten inert‐gas arc welding usually deteriorate the mechanical property and also lead to serious distortion of welded joints . Besides, autogenous laser beam welding is unsuitable to weld 7020 Al alloys mainly due to high reflectivity .…”

Section: Introductionmentioning

confidence: 99%

“…4 Unfortunately, widely used traditional fusion welding procedures such as metal inert-gas (MIG) arc welding and tungsten inert-gas arc welding usually Nomenclature: σ p0.2 , 0.2% offset proof yield strength; σ b , Ultimate tensile strength; A, Tensile fracture elongation; E, Young's modulus; σ y , Yield stress; R ε , Strain ratio; R, Stress ratio; f, Frequency; a, Crack length; N, Number of cycles; da/dN, Fatigue crack growth rate; ΔK, Stress intensity factor range; ΔK th , Stress intensity threshold; ε a , Total strain amplitude; ε a e , Elastic strain amplitude; ε a p , Plastic strain amplitude; 2N f , Reversals to failure; 2N T , The critical life of transition from low cycle fatigue to high cycle fatigue; σ′ f , Fatigue strength coefficient; b, Fatigue strength exponent; ε′ f , Fatigue ductility coefficient; c, Fatigue ductility exponent; C 0 , Solute concentration; R 0 , Solidification rate; G, Temperature gradient; d, Grain diameter; Δσ, Nominal stress range; N f , Number of cycles to failure; m, C, Material constants; Δσ m , Δσ k , Fatigue characteristic values deteriorate the mechanical property and also lead to serious distortion of welded joints. 5,6 Besides, autogenous laser beam welding is unsuitable to weld 7020 Al alloys mainly due to high reflectivity. 6,7 The hybrid laser-arc welding (HLW) method was therefore developed by Steen and Eboo in 1979, showing great potential to Al alloys with more stable welding process, deeper weld penetration, and larger gap tolerance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Song

et al. 2018

Fatigue Fract Eng Mat Struct

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Detailed investigations of microstructural feature, mechanical property, fatigue strength, and damage mechanism were conducted on hybrid laser welded 7020‐T651 aluminum alloys used into high‐speed railway vehicles. The results show that the hybrid laser welding process can induce significant changes of microstructures and alloying elements, together with numerous gas pores. Such local modifications degrade the fatigue performance. The tensile strength of welded joints was approximately 74% with respect to the base metal, thus satisfying the design standard. The fatigue property was determined in the low and high cycle regimes. It was found that the fatigue strength of welded joints was fairly inferior to that of the base metal, but far higher than the IIW recommended value. Furthermore, welding defects were well believed to contribute to the shorter fatigue life. The small fatigue crack growth presented highly discontinuous and inhomogeneous due to microstructure and porosity. By contrast, the crack stable growth stage was less sensitive to microstructural features of hybrid welded joints.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Song

et al. 2018

Fatigue Fract Eng Mat Struct

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“…The tensile properties and microhardness evolution of the heat-treatable aluminum alloy welds have been studied by several authors [4][5][6]. Ambriz et al [7] studied the Vickers microhardness distribution of 6061-T6 joints welded using a modified indirect electric arc (MIEA) technique to determine the different zones of the joints.…”

Section: Introductionmentioning

confidence: 99%

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

Wang

Xue

et al. 2017

Metals

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Abstract:Various heat input conditions and post-weld heat treatments were adopted to investigate the microstructure evolution and mechanical properties of tungsten inert gas (TIG) welded joints of AA6082-T6 with porosity defects. The results show that the fracture location is uncertain when an as-welded joint has porosities in the weld zone (WZ), and overaging in the heat-affected zone (HAZ) at the same time. When the fracture of the as-welded joint occurs in the HAZ, the total heat input has a linear relation with the tensile strength of the joint. An excess heat input induces the overgrowth of Mg 2 Si precipitates in HAZ and the coarsening of α-Al grains in WZ, resulting in a decrease in the microhardness of the corresponding areas. After artificial aging treatment, the tensile strength of the welded joint is increased by approximately 9-13% as compared to that of as-welded joint, and fracture also occurs in HAZ. In contrast, for solution treated and artificial aging treated joint, fracture occurs suddenly at the rising phase of the tensile curve due to porosity defects throughout the weld metal. Furthermore, the eutectic Si particles of WZ coarsen and spheroidize after solution treatment and artificial aging treatment, due to the diffusion of Si to the surface of the original Si phases when soaking at high temperature.

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Investigation of welding parameters on microstructure and mechanical properties of laser beam-welded joint of 2060 Al–Cu–Li alloy

Wei

Zhan

et al. 2016

Int J Adv Manuf Technol

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A characterization of microstructure and mechanical properties of A6N01S-T5 aluminum alloy hybrid fiber laser-MIG welded joint

Cited by 27 publications

References 24 publications

Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

Investigation of welding parameters on microstructure and mechanical properties of laser beam-welded joint of 2060 Al–Cu–Li alloy

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