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Technical Briefs

Electromagnetic Impact Welding of Al-to-Al–Li Sheets

[+] Author and Article Information
S. D. Kore1

Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai, 400076, Maharashtra, Indiakoresd@gmail.com

P. P. Date

Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai, 400076, Maharashtra, India

S. V. Kulkarni

Department of Electrical Engineering, IIT Bombay, Powai, Mumbai, 400076, Maharashtra, India

S. Kumar, M. R. Kulkarni, S. V. Desai, R. K. Rajawat, K. V. Nagesh, D. P. Chakravarty

Accelerator and Pulse Power Division, Bhabha Atomic Research Center, Mumbai, 400085, Maharashtra, India

1

Corresponding Author.

J. Manuf. Sci. Eng 131(3), 034502 (May 05, 2009) (4 pages) doi:10.1115/1.3123338 History: Received August 01, 2008; Revised February 09, 2009; Published May 05, 2009

The potential for weight savings resulting from the low density and high stiffness of aluminum-lithium (Al–Li) alloys and the difficulty in fusion welding of these alloys led to this study of solid state welding of Al–Li alloys for its potential application in the aerospace and automobile industries. The present study demonstrates the feasibility of electromagnetic (EM) welding of Al-to-Al–Li sheets by using Al drivers to drive the electrically poor conductive Al–Li sheets. A study has been carried out to characterize the electromagnetic impact welding of Al-to-Al–Li sheets of 1 mm thickness. Specific heat treatment cycle need to be followed prior to EM welding of Al–Li sheets. The results of the microstructure and tensile shear strength tests are reported.

FIGURES IN THIS ARTICLE
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Copyright © 2009 by American Society of Mechanical Engineers
Topics: Welding , Alloys
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References

Figures

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Figure 1

Schematic representation of electromagnetic impact welding equipment for Al-to-Al–Li sheets

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Figure 2

Relative variation in yield strength for three heat treatment methods (1=550°C/−17°C/24 h, 2=550°C/−17°C/8 h, 3=535°C/RT°C/1 h) (18)

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Figure 3

Current waveform at the discharge energy of 9.2 kJ, indicating the peak current of 234 kA and the pulse time of 54 μs (frequency: 18.5 kHz)

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Figure 4

Al-to-Al–Li sheets welded by EM welding

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Figure 5

Al-to-Al–Li welded sample showing the wavy interface at 200× magnification

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Figure 6

Magnified view of the wavy interface of Al-to-Al–Li weld at 500× magnification

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Figure 7

Schematic view of contacting metal surfaces, showing local asperities and layer of oxide, which affect EM welding

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Figure 8

EDAX results for Al-to-Al–Li no-weld zone

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