Microstructure and Properties of Butt Welding Joints of 2195-2219 Al-alloy Plates

doi:10.11901/1005.3093.2022.057

Chinese Journal of Materials Research

2023, Vol. 37

Issue (2): 152-160 DOI: 10.11901/1005.3093.2022.057

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Microstructure and Properties of Butt Welding Joints of 2195-2219 Al-alloy Plates

NIE Jingjing, GONG Zhengxuan, SUN Jingli(

), YANG Sida, XIA Xianchao, XU Aijie

Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China

Cite this article:

NIE Jingjing, GONG Zhengxuan, SUN Jingli, YANG Sida, XIA Xianchao, XU Aijie. Microstructure and Properties of Butt Welding Joints of 2195-2219 Al-alloy Plates. Chinese Journal of Materials Research, 2023, 37(2): 152-160.

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Abstract

Butt welding joints of 2195 and 2219 Al-alloy plates were prepared by tungsten argon arc welding (TIG) and variable polarity plasma arc welding (VPPA) respectively while applying argon shielding and no argon shielding, and then the influence of processing parameters on the microstructure of the welding joints were assessed by means of metallographic microscope, scanning electron microscope (SEM), hardness tester and tensile testing machine. The results show that no macroscopic thermal cracks were detected in the welding seam of the joints prepared by TIG and VPPA welding processes, however the VPPA welding process results in narrower welding seam due to its high speed processing with low heat input whilst high energy density. The main precipitates near the fusion line of the weld joints are θ-phase, while eutectic microstructure of α-Al and θ-phase exists in the weld seam. No local softening existed in welded joints prepared by TIG and VPPA with argon shielding, correspondingly, the hardness of the weld seam is more or less the same as that of the base metal of 2219 Al-alloy side, and the welding joints prepared by TIG possess higher tensile strength.

Key words: metallic materials aluminum alloy 2195 2219 welded joint microstructure mechanical property

Received: 17 January 2022

ZTFLH:

TG406

About author: SUN Jingli, Tel: (021)37842971, E-mail: Sunjingli1221@126.com

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	Jingjing NIE
	Zhengxuan GONG
	Jingli SUN
	Sida YANG
	Xianchao XIA
	Aijie XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.057 OR https://www.cjmr.org/EN/Y2023/V37/I2/152

Table 1 Composition of base metal and welding wire (mass fraction, %)

Table 2 Welding method and process parameters

Fig.1 Metallographic of 1# sample at different locations (a) overall morphology of the welded joint; (b) 2195 base metal; (c) connection between 2195 side and weld zone; (d) weld center zone; (e) connection between 2219 side and weld zone; (f) connection zone between reverse side and weld

Fig.2 Metallographic of 2# sample at different locations(a) overall morphology of the welded joint; (b) 2195 base metal; (c) connection between 2195 side and weld zone; (d) weld center zone; (e) connection between 2219 side and weld zone; (f) connection zone between reverse side and weld

Fig.3 Metallographic of 3# sample at different locations (a) overall morphology of the welded joint; (b) connection between 2195 side and weld zone; (c) weld center zone; (d) connection between 2219 side and weld zone; (e) 2219 base metal

Fig.4 Microstructure near the fusion line of 1# sample 2195 side (a) and EDS results of Al, Cu, Mg, Li and C (b~f)

Fig.5 Microstructure near fusion line of different samples (a) 1# sample; (b) 2# sample; (c) 3# sample; (a2) (b2) and (c2) enlarged views of the corresponding areas of (a1) (a1) and (c1)

Table 3 Composition at different locations in Fig.5 (mass fraction, %)

Fig.6 Microstructure of weld zone of different samples (a) 1# sample; (b) 2# sample; (c) 3# sample; (a2) (b2) and (c2) are enlarged views of the corresponding areas of (a1) (a1) and (c1)

Table 4 Composition at different locations in Fig.6 (mass fraction, %)

Fig.7 Mechanical properties of samples welded by different methods

Fig.8 Morphology of welded joints welded by different methods after tensile test (a) 1# sample; (b) 2# sample; (c) 3# sample

Fig.9 Microhardness distribution of samples welded by different methods

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