1. Explosive welding of tin
EPNM 2012 Strasbourg
Explosive welding of tin
Petr Nesvadba, Katerina Busova, Petr Havlicek, Josef Ondruska
OZM Research
Instruments & Technologies for Energetic Materials
Czech Republic
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2. Experimental Procedure and Materials Test Results Conclusion
OUTLINE
Introduction
Experimental Procedure and Materials
Test Results
Conclusion
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3. Motivation Semi-products for manufacturing the Cu–Sn targets
INTRODUCTION
Motivation
Semi-products for manufacturing the Cu–Sn targets
Weld ability of Sn and selected metals
Test of new explosives mixture
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4. EXPERIMENTAL PROCEDURE
AND MATERIALS
Problems
Melting point Sn = 232°C (449°F)
Manipulation with low-strength metal
Simultaneous method of cladding
Achieving more than 10 mm Sn layer
Explosive composition with low detonation velocity
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5. EXPERIMENTAL PROCEDURE AND MATERIALS
Samples of explosives
Sample
Compound [%]
Density
[g.cm-3]
Thickness of explosive layer
[mm]
Detonation velocity
[m.s-1]
Sensitivity to detonator No. 8
PETN
NaHCO3
NaNO3 Al
Paraffin 1 12
77,5 - 10
0,5
1,05 20
1600
yes 2 81 8
1,0
1350 3 83
1200 4 6 85
950 no 5
0,91
1220
0,95
1100 7 89
0,97
1270 87
0,90 – 0,95 9 60 29
0,92 – 0,95
790
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6. EXPERIMENTAL PROCEDURE AND MATERIALS
Samples of explosives
Sample
Compound [%]
Density
[g.cm-3]
Thickness of explosive layer
[mm]
Detonation velocity
[m.s-1]
Sensitivity to detonater
No. 8
PETN
NaHCO3
NaNO3
Micro bubbles K15 10 6 - 94
1,18 20
1075
yes 11 8 92
1,0 – 1,2 12 90
1460
unreliably
S012 88
0,97 – 1,17
S012K 87 1
0,90 – 1,02
S010
1,00 – 1,04
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7. EXPERIMENTAL PROCEDURE
AND MATERIALS
Sample of explosives no. 6 (S08A6)
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8. EXPERIMENTAL PROCEDURE
AND MATERIALS
Sample of explosives S012K
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9. EXPERIMENTAL PROCEDURE
AND MATERIALS
Accelerating of plate 2 3 1
Trajectory [mm]
Speed of plate [m.s-1]
1 Theoretical course Semtex S30
2 Area of measured data Semtex S30
3 Area of measured data S012K
weight of explosives / weight of plate = 2.0
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10. EXPERIMENTAL PROCEDURE
AND MATERIALS Sn
Mosadz
Steel
Brass Al Cu
D = 1400 m.s-1
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11. EXPERIMENTAL PROCEDURE Microstructure of bimetal steel – Sn
AND MATERIALS Sn
Steel
Microstructure of bimetal steel – Sn
D = 1181 m.s-1
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12. EXPERIMENTAL PROCEDURE Microstructure of bimetal Al – Sn
AND MATERIALS Sn Al
Microstructure of bimetal Al – Sn
D = 1181 m.s-1
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13. EXPERIMENTAL PROCEDURE Microstructure of bimetal Brass – Sn
AND MATERIALS Sn
Brass
Microstructure of bimetal Brass – Sn
D = 1413 m.s-1
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14. EXPERIMENTAL PROCEDURE Microstructure of bimetal Cu – Sn
AND MATERIALS Sn Sn Cu Cu
Microstructure of bimetal Cu – Sn
D = 1181 m.s-1
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15. EXPERIMENTAL PROCEDURE
AND MATERIALS
4 mm Sn
D = 1418 m.s-1
1 mm Sn
D = 1238 m.s-1
Explosive welding of Cu – Sn samples
Thickness Sn from 1 to 12 mm
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16. EXPERIMENTAL PROCEDURE
AND MATERIALS
Melting of Sn – Sn interface
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17. EXPERIMENTAL PROCEDURE
AND MATERIALS
Melting of Sn – Sn interface
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18. EXPERIMENTAL PROCEDURE
AND MATERIALS
Cu – Sn bimetal
Crack on the interface Cu – Sn by simultaneous cladding of two Sn layer
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19. Selected metal materials are possible cladding by tin
TEST RESULTS
Cladding of tin with others metal materials by using explosives with detonation velocity not exceeding 1500 m.s-1, optimum max m.s-1
Selected metal materials are possible cladding by tin
It is possible to clad tin in various thickness
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20. It managed to clad tin on steel, aluminum, brass and copper
CONCLUSION
It managed to clad tin on steel, aluminum, brass and copper
Local melting zone of tin is not possible to eliminate probably
Melting of tin during cladding of tin thickness 6 mm and more
Failed to clad Sn + Sn, in all cases was observed melting interface
Simultaneously cladding of tin was not successful
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21. THANK YOU FOR YOUR
ATTENTION
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