Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding

Hongwei Liu; Jinglong Li; Zhihua Ma; Bing Ma; Shengqiang Feng

doi:10.2991/emeit.2012.324

Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding

Hongwei Liu, Jinglong Li, Zhihua Ma, Bing Ma, Shengqiang Feng

School of Materials Sience and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

7A05 aluminum alloy joints were fabricated by Laser-MIG hybrid welding, of which the tensile strength was tested at room temperature. The tensile fracture surfaces and microstructure were analyzed by SEM and TEM. The fracture surface analysis showed fracture morphologies of small dimple of 2 ∼ 5μm on the heat affected zone (HAZ) and big dimple of 30 ∼ 50μm on the weld bead. The fracture is inter-granular fracture with a small amount of cleavage fracture. TEM analysis showed that the HAZ region didn't exists η'-phase, but Al₃Zr, i.e., during welding thermal cycle, the joints appeared obvious η'-phase back dissolved so that lost η'-phase dispersion strengthening effect. O, Na and Fe impurities were detected in the joint, of which the crack originated during tensile testing. Both the impurities and η'-phase back dissolved are responsible for the degrading of the welded joints mechanical properties.

Original language	English
Title of host publication	Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012
Publisher	Atlantis Press
Pages	1465-1470
Number of pages	6
ISBN (Print)	9789078677604
DOIs	https://doi.org/10.2991/emeit.2012.324
State	Published - 2012
Event	2012 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 - Shenyang, Liaoning, China Duration: 26 Sep 2012 → 28 Sep 2012

Publication series

Name	Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012

Conference

Conference	2012 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012
Country/Territory	China
City	Shenyang, Liaoning
Period	26/09/12 → 28/09/12

Keywords

7A05 aluminum alloy
Laser-MIG hybrid welding
Mechanical properties
Microstructure analysis

Access to Document

10.2991/emeit.2012.324

Cite this

Liu, H., Li, J., Ma, Z., Ma, B., & Feng, S. (2012). Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding. In Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 (pp. 1465-1470). (Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012). Atlantis Press. https://doi.org/10.2991/emeit.2012.324

Liu, Hongwei ; Li, Jinglong ; Ma, Zhihua et al. / Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding. Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012. Atlantis Press, 2012. pp. 1465-1470 (Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012).

@inproceedings{f5449d82fcb5406781cad8d0b58277e3,

title = "Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding",

abstract = "7A05 aluminum alloy joints were fabricated by Laser-MIG hybrid welding, of which the tensile strength was tested at room temperature. The tensile fracture surfaces and microstructure were analyzed by SEM and TEM. The fracture surface analysis showed fracture morphologies of small dimple of 2 ∼ 5μm on the heat affected zone (HAZ) and big dimple of 30 ∼ 50μm on the weld bead. The fracture is inter-granular fracture with a small amount of cleavage fracture. TEM analysis showed that the HAZ region didn't exists η'-phase, but Al3Zr, i.e., during welding thermal cycle, the joints appeared obvious η'-phase back dissolved so that lost η'-phase dispersion strengthening effect. O, Na and Fe impurities were detected in the joint, of which the crack originated during tensile testing. Both the impurities and η'-phase back dissolved are responsible for the degrading of the welded joints mechanical properties.",

keywords = "7A05 aluminum alloy, Laser-MIG hybrid welding, Mechanical properties, Microstructure analysis",

author = "Hongwei Liu and Jinglong Li and Zhihua Ma and Bing Ma and Shengqiang Feng",

year = "2012",

doi = "10.2991/emeit.2012.324",

language = "英语",

isbn = "9789078677604",

series = "Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012",

publisher = "Atlantis Press",

pages = "1465--1470",

booktitle = "Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012",

note = "2012 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 ; Conference date: 26-09-2012 Through 28-09-2012",

}

Liu, H, Li, J, Ma, Z, Ma, B & Feng, S 2012, Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding. in Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012. Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012, Atlantis Press, pp. 1465-1470, 2012 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012, Shenyang, Liaoning, China, 26/09/12. https://doi.org/10.2991/emeit.2012.324

Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding. / Liu, Hongwei; Li, Jinglong; Ma, Zhihua et al.
Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012. Atlantis Press, 2012. p. 1465-1470 (Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding

AU - Liu, Hongwei

AU - Li, Jinglong

AU - Ma, Zhihua

AU - Ma, Bing

AU - Feng, Shengqiang

PY - 2012

Y1 - 2012

N2 - 7A05 aluminum alloy joints were fabricated by Laser-MIG hybrid welding, of which the tensile strength was tested at room temperature. The tensile fracture surfaces and microstructure were analyzed by SEM and TEM. The fracture surface analysis showed fracture morphologies of small dimple of 2 ∼ 5μm on the heat affected zone (HAZ) and big dimple of 30 ∼ 50μm on the weld bead. The fracture is inter-granular fracture with a small amount of cleavage fracture. TEM analysis showed that the HAZ region didn't exists η'-phase, but Al3Zr, i.e., during welding thermal cycle, the joints appeared obvious η'-phase back dissolved so that lost η'-phase dispersion strengthening effect. O, Na and Fe impurities were detected in the joint, of which the crack originated during tensile testing. Both the impurities and η'-phase back dissolved are responsible for the degrading of the welded joints mechanical properties.

AB - 7A05 aluminum alloy joints were fabricated by Laser-MIG hybrid welding, of which the tensile strength was tested at room temperature. The tensile fracture surfaces and microstructure were analyzed by SEM and TEM. The fracture surface analysis showed fracture morphologies of small dimple of 2 ∼ 5μm on the heat affected zone (HAZ) and big dimple of 30 ∼ 50μm on the weld bead. The fracture is inter-granular fracture with a small amount of cleavage fracture. TEM analysis showed that the HAZ region didn't exists η'-phase, but Al3Zr, i.e., during welding thermal cycle, the joints appeared obvious η'-phase back dissolved so that lost η'-phase dispersion strengthening effect. O, Na and Fe impurities were detected in the joint, of which the crack originated during tensile testing. Both the impurities and η'-phase back dissolved are responsible for the degrading of the welded joints mechanical properties.

KW - 7A05 aluminum alloy

KW - Laser-MIG hybrid welding

KW - Mechanical properties

KW - Microstructure analysis

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T3 - Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012

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BT - Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012

PB - Atlantis Press

T2 - 2012 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012

Y2 - 26 September 2012 through 28 September 2012

ER -

Liu H, Li J, Ma Z, Ma B, Feng S. Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding. In Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012. Atlantis Press. 2012. p. 1465-1470. (Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012). doi: 10.2991/emeit.2012.324

Study on mechanical properties and microstructure analysis of welded joints of 7A05 aluminum alloy by Laser-MIG hybrid welding

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