Effect of Filling Material with Different Si Content on Microstructure and Properties of Laser-CMT Aluminum Alloy Joints

Xiaming Chen; Xiaonan Wang; Qipeng Dong; Zhen Zhu; Nagaumi Hiromi

doi:10.3788/CJL202148.2202003

Chinese Journal of Lasers, Volume. 48, Issue 22, 2202003(2021)

Effect of Filling Material with Different Si Content on Microstructure and Properties of Laser-CMT Aluminum Alloy Joints

Xiaming Chen^1,2, Xiaonan Wang^1、*, Qipeng Dong^1,2, Zhen Zhu^1,2, and Nagaumi Hiromi^1,2

Author Affiliations

¹School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215021, China

²High-Performance Metal Structural Materials Research Institute, Soochow University, Suzhou, Jiangsu 215021, China

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Figures & Tables(12)

Fig. 1. Schematic of laser-CMT welding

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Fig. 2. Microstructure and grain morphologies of weld center. (a)(c) Al-Si5; (b)(d) Al-Si10

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Fig. 3. Grain size and thermal conductivity of weld seam. (a) Grain size; (b) thermal conductivity

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Fig. 4. KAM maps and KAM distribution of weld seam. (a) Al-Si5; (b) Al-Si10; (c) KAM distribution

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Fig. 5. Mircrohardness distribution of welded joints and comparison between microhardness of weld seams. (a) Microhardness distribution of welded joints; (b) comparison between microhardness of weld seams

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$Macroscopic morphology of welded joint and stress-strain curve. (a) Macroscopic morphology; (b) engineering stress-strain curve; (c) fracture morphology$

Fig. 6. Macroscopic morphology of welded joint and stress-strain curve. (a) Macroscopic morphology; (b) engineering stress-strain curve; (c) fracture morphology

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Fig. 7. Yield strength and its increment of the two welds

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Fig. 8. Droplet transfer and keyhole morphology. (a) Current waveform; (b) stage B amplification; (c) droplet transfer and keyhole morphology

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Table 1. Mass fraction of chemical compositions of base metal and filling materials unit: %
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Table 1. Mass fraction of chemical compositions of base metal and filling materials unit: %
Material Si Mg Fe Mn Cr Cu Zn Ti Al
Base metal 1.0 0.7 0.1 0.6 <0.1 <0.1 <0.1 <0.11 Bal.
Al-Si5 5.0 <0.1 0.2 <0.1 <0.1 <0.1 <0.1 <0.1
Al-Si10 11.0 <0.1 0.2 <0.1 <0.1 <0.1 <0.1 <0.1

Table 2. Element mass fraction of EDS analysis of weld microstructure unit: %

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Table 2. Element mass fraction of EDS analysis of weld microstructure unit: %

Filling material	Phase	Si	Mg	Fe	Mn	Al	Possible phase
Al-Si5	White phase	6.40	0.7	1.70	2.00	Bal.	AlFeSi
	White phase	11.30	2.10		0.80		Eutectic Si
	α-Al	0.35	0.30				α-Al
Al-Si10	White phase	9.60	1.30	4.70	4.10	Bal.	AlFeSi
	White phase	11.10	2.40		1.60		Eutectic Si
	α-Al	0.60	0.30				α-Al

Table 3. Mass fraction of chemical composition of weld seam with different filling materials unit: %
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Table 3. Mass fraction of chemical composition of weld seam with different filling materials unit: %
Filling material Si Mg Fe Mn Cr Cu Zn Ti Al
Al-Si5 1.46 0.50 0.15 0.42 <0.01 <0.01 <0.01 0.02 Bal.
Al-Si10 2.34 0.50 0.15 0.42 <0.01 <0.01 <0.01 0.02

Table 4. KAM and dislocation density of both welds
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Table 4. KAM and dislocation density of both welds
Parameter Al-Si5 Al-Si10
KAM /℃ 0.564 0.557
ρ /m^-2 2.16×10¹² 2.14×10¹²

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Xiaming Chen, Xiaonan Wang, Qipeng Dong, Zhen Zhu, Nagaumi Hiromi. Effect of Filling Material with Different Si Content on Microstructure and Properties of Laser-CMT Aluminum Alloy Joints[J]. Chinese Journal of Lasers, 2021, 48(22): 2202003

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Paper Information

Category: laser manufacturing

Received: Apr. 13, 2021

Accepted: May. 24, 2021

Published Online: Oct. 28, 2021

The Author Email: Wang Xiaonan (wxn@suda.edu.cn)

DOI:10.3788/CJL202148.2202003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Mass fraction of chemical compositions of base metal and filling materials unit: %

Table 1. Mass fraction of chemical compositions of base metal and filling materials unit: %

Table 2. Element mass fraction of EDS analysis of weld microstructure unit: %

Table 2. Element mass fraction of EDS analysis of weld microstructure unit: %

Table 3. Mass fraction of chemical composition of weld seam with different filling materials unit: %

Table 3. Mass fraction of chemical composition of weld seam with different filling materials unit: %

Table 4. KAM and dislocation density of both welds

Table 4. KAM and dislocation density of both welds