Microstructure homogenization of 2A14 aluminum alloy weld seam by ultrasonic irradiation in metal inert gas welding

AbstractFour-millimeter thick A7N01-T4 aluminum alloy plates were welded by double wire metal inert gas welding (DWMW) in high welding speeds, ranging from 1100 to 1250 mm/min. The results show that a sound joint could be obtained at a high speed of 1200 mm/min using DWMW. The weld zone (WZ) in the joint showed a dendritic structure of equiaxed grains, and in the fusion zone (FZ), the microstructure existed as a fine equiaxed crystal structure about 100 µm in thickness. In the WZ adjacent to the FZ, elongated columnar crystal structure distributed along to the interface, and coarse microstructure in the heat affected zone (HAZ) were found, showing a typical rolling texture. The main precipitates in the WZ were assumed to be Fe-enriched phases, and Mg- and Zn-enriched phases. Tensile fracture generally occurred in the WZ adjacent to the FZ with a decrease in ductility, and it was consistent with the results of the microstructure analysis and hardness profile. The mean ultimate tensile strength and elongation of specimens were 302 MPa and 4.5 %, respectively.

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Optimization of Metal Inert-Gas Welding Process for 5052 Aluminum Alloy by Artificial Neural Network

Russian Journal of Non-Ferrous Metals ◽

10.3103/s1067821221050059 ◽

2021 ◽

Vol 62 (5) ◽

pp. 568-579

Author(s):

Jiong Pu ◽

Yanhong Wei ◽

Shangzhi Xiang ◽

Wenmin Ou ◽

Renpei Liu

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Aluminum Alloy ◽

Welding Process ◽

Inert Gas ◽

Metal Inert Gas Welding ◽

Artificial Neural

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Mechanical properties of friction stir welding and metal inert gas welding of Al-Zn aluminum alloy joints

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-017-0021-y ◽

2017 ◽

Vol 91 (9-12) ◽

pp. 3025-3031 ◽

Cited By ~ 9

Author(s):

Zhongjie Yan ◽

Xuesong Liu ◽

Hongyuan Fang

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Friction Stir Welding ◽

Inert Gas ◽

Friction Stir ◽

Metal Inert Gas Welding

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Intergranular corrosion susceptibility of 6061 aluminum alloy welded joints

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.1515/ijmr-2021-8231 ◽

2021 ◽

Vol 112 (8) ◽

pp. 610-616

Author(s):

Lihua Gong ◽

Weimin Guo ◽

Yang Li

Keyword(s):

Aluminum Alloy ◽

Friction Stir Welding ◽

Welded Joints ◽

Intergranular Corrosion ◽

Inert Gas ◽

6061 Aluminum Alloy ◽

Friction Stir ◽

Melted Zone ◽

Metal Inert Gas Welding ◽

Welding Joints

Abstract The intergranular corrosion behavior of 6061 aluminum alloy welded joints produced by metal inert gas welding and friction stir welding was studied. The microstructure of the welded joints and the intergranular corrosion morphology of the cross-section were analyzed by optical microscopy. The results show that the most sensitive area of intergranular corrosion is the partially melted zone of the metal inert gas welding, and the maximum corrosion depth is about seven times that of the base metal, followed by the unmixed zone. The heat affected zone has the lowest sensitivity. Although the welding seam corroded seriously, general corrosion played a leading role. With the high heat input of metal inert gas welding, the sensitivity to intergranular corrosion in the partially melted zone increased significantly, while other zones had little change. For friction stir welding joints, the heat affected zone suffered from the most severe corrosion, and the nugget zone the least. However, the difference is not apparent. The susceptibility to intergranular corrosion of friction stir welding joints is weaker than that of metal inert gas welding joints but more severe than the base metal.

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ANALYSIS AND COMPARISON OF ALUMINUM ALLOY WELDED JOINTS BETWEEN METAL INERT GAS WELDING AND TUNGSTEN INERT GAS WELDING

Surface Review and Letters ◽

10.1142/s0218625x15500791 ◽

2015 ◽

Vol 22 (06) ◽

pp. 1550079 ◽

Cited By ~ 2

Author(s):

LEI ZHAO ◽

YINGCHUN GUAN ◽

QIANG WANG ◽

BAOQIANG CONG ◽

BOJIN QI

Keyword(s):

Aluminum Alloy ◽

Inert Gas ◽

Xps Analysis ◽

Mig Welding ◽

Tungsten Inert Gas Welding ◽

Addition Method ◽

Metal Inert Gas Welding ◽

The Difference ◽

Welding Processes ◽

And Tungsten

Surface contamination usually occurs during welding processing and it affects the welds quality largely. However, the formation of such contaminants has seldom been studied. Effort was made to study the contaminants caused by metal inert gas (MIG) welding and tungsten inert gas (TIG) welding processes of aluminum alloy, respectively. SEM, FTIR and XPS analysis was carried out to investigate the microstructure as well as surface chemistry. These contaminants were found to be mainly consisting of Al 2 O 3, MgO , carbide and chromium complexes. The difference of contaminants between MIG and TIG welds was further examined. In addition, method to minimize these contaminants was proposed.

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