Study of local-zone microstructure, strength and fracture toughness of hybrid laser-metal-inert-gas-welded A7N01 aluminum alloy joint

Wang, Xiaomin; Li, Bo; Li, Mingxing; Huang, Cui; Chen, Hui

doi:10.1016/j.msea.2017.01.087

Cited by 30 publications

(14 citation statements)

References 24 publications

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“…No dissolution normally happens to Al 3 Zr inside EQZ, while the higher temperature towards the weld center leads to a considerable dissolution of the particle Al 3 Zr. Due to low heat input and high welding speed, the hybrid laser welding process can generally facilitate the formation of EQZ . It has been demonstrated that fine equiaxed grains in EQZ are surrounded by eutectic structures, indicating a high cracking susceptibility .…”

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%

“…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 . 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%

“…Besides, autogenous laser beam welding is unsuitable to weld 7020 Al alloys mainly due to high reflectivity . 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%

“…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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Improved Toughness of a High‐Strength Low‐Alloy Steel for Arctic Ship by Ni and Mo Addition

et al. 2020

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The effect of Ni and Mo addition on the microstructures of a high strength low alloy (HSLA) steel under the thermo-mechanical control processing (TMCP) process is currently unknown, which is herein explored by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). As the Ni increase from 0.6 to 0.9 wt%, the volume fraction of bainitic ferrite increase from 30% to 50%, the average size decrease from 3 to 2 μm, and the size of the martensiteaustenite (M-A) constituent decrease from 1.2 to 0.7 μm. The volume fraction of bainitic ferrite increases from 30% to 85%, and grain size increases from 3 to 5 μm with increasing Mo from 0 to 0.2 wt%. The size of M-A constituent decreases from 1.2 to 0.3 μm. Impact absorbed energy at À100 C increases from 50 to 70 J as the Ni increase from 0.6 to 0.9 wt%, which decreases from 50 to 10 J with increasing Mo from 0 to 0.2 wt%. The improved impact toughness mainly results from the decreasing size of the grain and the M-A constituent with the increase in Ni from 0.6 to 0.9 wt%.

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Double-sided hybrid laser-MIG welding plus MIG welding of 30-mm-thick aluminium alloy

Zhao

Hua

Huang

et al. 2018

Int J Adv Manuf Technol

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Study of local-zone microstructure, strength and fracture toughness of hybrid laser-metal-inert-gas-welded A7N01 aluminum alloy joint

Cited by 30 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

Improved Toughness of a High‐Strength Low‐Alloy Steel for Arctic Ship by Ni and Mo Addition

Double-sided hybrid laser-MIG welding plus MIG welding of 30-mm-thick aluminium alloy

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