Cold metal transfer welding of AlSi7Mg alloy sheets prepared by selective laser melting

Wu, Defan; Cui, Li; Wu, Xu; Guo, Xingye; Shao, Wei; Tan, Zhen; He, Dingyong

doi:10.1016/j.jmapro.2022.10.013

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…However, the low wettability and inhomogeneous distribution of reinforcement particles limit the mechanical properties of aluminum matrix composites [ 3 , 10 ]. Laser powder bed fusion has been widely used in the metal additive manufacturing of aluminum matrix composites [ [11] , [12] , [13] ]. Melting the powder by the layer-by-layer strategy with laser beam scanning at designed paths, the LPBF process provides a promising approach to near-net manufacturing parts with complex structures, which reveals superiorities in product development and material saving [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and molten pool morphology of TiB2/ AlSi7Mg composites fabricated by infrared-blue hybrid laser powder bed fusion

Wu,

Yang,

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Microstructure and molten pool morphology of TiB2/ AlSi7Mg composites fabricated by infrared-blue hybrid laser powder bed fusion

Wu,

Yang,

et al. 2024

Heliyon

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“…Furthermore, repairing PBF-LB/M components through welding is more cost-effective and time-saving than replacing them, making welding of PBF-LB/M parts a practical solution for further applications [4]. Until now, some efforts have been devoted to developing joining techniques for the AlSi10Mg alloys fabricated by PBF-LB/M, for instance, tungsten inert gas welding [3], cold metal transfer welding [5], electron beam welding [6,7], laser welding [2,8] and friction stir welding [9,10]. However, it is very challenging to fusion welding of AlSi10Mg alloys fabricated by PBF-LB/M due to the reduced joint performance and high susceptibility to hydrogen pores [3].…”

Section: Introductionmentioning

confidence: 99%

Improved tensile strength of welded AlSi10Mg alloys by using laser metal deposition

Wang,

He,

Cui

et al. 2023

Science and Technology of Welding and Joining

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Laser metal deposition process was introduced to join AlSi10Mg alloys fabricated by powder bed fusion-laser beam/metal to improve the tensile strength of laser welded joints. The size and the porosity of the hydrogen pores in the weld seam are significantly reduced by laser metal deposition welding. The ultimate tensile strength of the welded joint by using laser metal deposition reaches 318.8 MPa, and the microhardness of the weld seam ranges from 99.5 to 105.4 HV. Compared with single-pass welding, the ultimate tensile strength and hardness are increased by 60.6% and 27.6%. This is mainly attributed to the reduced porosity, refined α-Al structures and increased connectivity of the Si-rich networks of the weld seam achieved by laser metal deposition welding.

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“…However, the size of the LPBF parts is limited by the dimensions of the building chamber available, which makes it difficult to meet the requirements of directly forming the large-sized and complex shaped components [5]. Therefore, joining LPBF parts or joining a LPBF part to a conventionally fabricated part with a suitable welding technique is a good way to overcome this limitation [6]. Furthermore, repairing damaged LPBF components in service by means of welding is more costeffective and time-saving than replacing them, making welding of LPBF parts a good solution for further applications [7].…”

Section: Introductionmentioning

confidence: 99%

“…Peng et al [10] found that the porosity of the WMs in LPBF AlSi10Mg and casting AlSi10Mg alloys produced by autogenous laser welding was about 7.0% and 0.27%, respectively. Wu et al [6] used ER4047 and ER5356 filler wire for cold metal transfer (CMT) welding of AlSi7Mg alloys, reducing the total porosity in WM from 9.3% to 7.9%. They suggested that the addition of Mg elements into the WM was beneficial to reduce the porosity but still remain high porosity.…”

Section: Introductionmentioning

confidence: 99%

Welding of additive manufacturing AlSi10Mg alloys using a laser metal deposition process with different heat input

Li,

Cui,

et al. 2023

Preprint

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Welding of AlSi10Mg alloys fabricated by additive manufacturing (AM) has been recently conducted in response to the demands for joining or repairing the AM parts. However, high susceptibility to porosity occurred in the weld metal (WM) poses a significant challenge for fusion welding of AM AlSi10Mg alloys. The laser metal deposition (LMD) process has emerged as a promising welding solution due to its low dilution rate for reducing the porosity. In this study, LMD welding of AM AlSi10Mg alloys was carried out employing different heat input with five and eight tracks. The study systematically assessed the impact of heat input on porosity, microstructure, microhardness, and tensile properties of the welded joints. As a result, the decrease of heat input from 200 to 65 J/mm results in a substantial reduction in porosity from 7.0% to 2.1%. Additionally, this reduction leads to a 29.4% increase in ultimate tensile strength (UTS) and an 11.7% increase in elongation-to-failure (EI). Notably, the upper region of joints with eight tracks possessing low heat input displays lower porosity and superior mechanical properties than the bottom region with relatively high heat input. Furthermore, the WM with eight tracks exhibits a refinement of α-Al cells and Si-rich eutectic phases, improved connectivity of Si-rich networks, increased solid solution strengthening, compared to the five-track joints with higher heat input. In conclusion, low heat input of the upper region in the LMD welded joints has proven effective in minimizing hydrogen pores, enhancing WM microstructure, and improving the mechanical properties of welded joints.

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Cold metal transfer welding of AlSi7Mg alloy sheets prepared by selective laser melting

Cited by 14 publications

References 31 publications

Microstructure and molten pool morphology of TiB2/ AlSi7Mg composites fabricated by infrared-blue hybrid laser powder bed fusion

Microstructure and molten pool morphology of TiB2/ AlSi7Mg composites fabricated by infrared-blue hybrid laser powder bed fusion

Improved tensile strength of welded AlSi10Mg alloys by using laser metal deposition

Welding of additive manufacturing AlSi10Mg alloys using a laser metal deposition process with different heat input

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