1 national academy of sciences of ukraine combine technology for production of coaxial cu-al...

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NATIONAL ACADEMY OF SCIENCES OF UKRAINE

COMBINE TECHNOLOGY FOR PRODUCTIONOF COAXIAL Cu-Al ELECTRIC CONDUCTORS

BY EXPLOSION CLADDING AND DRAWINGFOR AIRCRAFT INDUSTRY

Dobrushin L.D., Bryzgalin A.G., Shlonskii P.S.,Dobrushin L.D., Bryzgalin A.G., Shlonskii P.S., Lavrenko I.G., Romashko I.M., Lavrenko I.G., Romashko I.M.,

Hugo GroeneveldHugo Groeneveld

The E.O. Paton Electric Welding Institute (PWI)

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1. Title

2. Speaker

Dr. Andrey G. BryzgalinThe E.O. Paton Electric Welding Institute (PWI) of NAS of Ukraine

Department on Welding, Cutting and Treatment of Metals by Explosion

PRODUCTION OF COAXIAL Cu-Al CONDUCTORS

COMBINE TECHNOLOGY FOR PRODUCTIONOF COAXIAL Cu-Al ELECTRIC CONDUCTORS BY EXPLOSION CLADDING AND DRAWING

FOR AIRCRAFT INDUSTRY

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3. Introduction


Electric conductors for powersupply and control system of

aircrafts have to have low weight, high capacity and reliability.

Bimetal Cu-Al conductors using explosion cladding and further

drawing were investigated forproduction of such conductors.

Technical requirements to Cu-Al conductors are the following:

1. Proper thickness of conductors Cu shell should be constant.

2. Intermetallic compounds at the interface should be absent;

2. Elasticity for 3D formability of conductors should be provided;

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4. Principal Design and Performance

Cu-Al Coaxial Conductor and its Longitudinal Section

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5. Explosion Cladding & Drawing


Scheme of Explosion Cladding Equipment for Further Drawing of Clad Cu-Al Rods

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Required quality of Cu-Al interface were provided by: - Lower boundary of explosion welding;

- Optimal cladding length of workpieces;- Proper routing of mechanical drawing;- Optimal conditions of post heat treatment.

Remark: a standard Cu tubes were used in calculations.

6. Quality Providing Aspects

Optimal Geometry of Cu-Al Explosion Clad Rod Ø 26 mm before Further Drawing

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Electrical Conductivity = 0,027 Ohm/m

Heat Treat. σy, MPa σt, MPa δ, %Interme-

tallics

1 - 187 210 11 -

2 350 °C, 1 H 44 113 57 +

3 250°C, 1 H 171 187 18 -

4 300°C, 40 min 127 149 28 -

7. Mechanical Properties of Cu-Al Rod

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Quantity of passed bends: without heat treatment – 3 times after heat treatment – 24 times

8. Bending Test Results


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Developed combine technology of explosion cladding andfurther drawing provides intermetallic free Cu-Al interface

8. Microstructure of Cu-Al Interface


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9. Semi-Finished Cu-Al Conductors


PWI is capable to produce

by developed combine

explosion cladding and

drawing technology Cu-Al

conductors as a bus-bar

of the following parameters:

Dia: 8.0 and 8.8 mm;

Cu Shell thickness: 0.3 mm;

Medium density: 3.6 g/cm3

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10. Finished Cu-Al Conductors


Typical Cu-Al Shaped

Conductors used in

Aircraft Industry

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11. Main Conclusions

THANKS FOR YOUR ATTENTION!


1. Combine technology for production of coaxial Cu+Al electric

conductors by explosion cladding and drawing have been

developed and successfully tested.

2. Explosion cladding with further drawing opens possibility to

perform cladding at lower limit of the process, what provides

high quality interface and service properties of conductors.

3. The developed combine technology is recommended for

production of Cu-Al conductors (bus-bars) for power supply

and control systems in aircraft and other industries.

1 national academy of sciences of ukraine combine technology for production of coaxial cu-al...

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