Transcript EPNM 2012 Strasbourg Explosive welding of tin Petr Nesvadba, Katerina Busova, Petr Havlicek, Josef Ondruska OZM Research Instruments & Technologies for Energetic Materials Czech Republic 1/21 OUTLINE 

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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OUTLINE
 Introduction
 Experimental Procedure and Materials
 Test Results
 Conclusion
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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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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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EXPERIMENTAL PROCEDURE
AND MATERIALS
Samples of explosives
Compound [%]
Density
[g.cm-3]
Sample
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
1600
yes
2
10
81
-
8
1
1,0
1350
yes
3
8
83
-
8
1
1,0
1200
yes
4
6
85
-
8
1
1,0
950
no
5
6
83
-
10
1
0,91
1220
yes
6
8
85
-
6
1
0,95
1100
yes
7
6
-
89
4
1
0,97
1270
yes
8
8
87
-
4
1
0,90 – 0,95
870 - 1010
yes
9
6
60
29
4
1
0,92 – 0,95
790
no
20
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Samples of explosives
Compound [%]
Sample
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
1075
yes
11
8
-
92
-
1,0 – 1,2
1090 - 1300
yes
12
10
-
90
-
1,18
1460
unreliably
S012
12
88
-
-
0,97 – 1,17
1260 - 1500
yes
S012K
12
87
-
1
0,90 – 1,02
1000 - 1250
yes
S010
10
90
-
-
1,00 – 1,04
1070 - 1250
unreliably
20
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sample of explosives no. 6 (S08A6)
Detonation velocity [m.s -1]
1400
1300
1200
1100
1000
900
800
10
20
30
Thickness of charge [mm]
40
50
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sample of explosives S012K
Detonation velocity [m.s -1]
1400
1300
1200
1100
1000
900
800
0
10
20
30
40
Thickness of charge [mm]
50
60
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Accelerating of plate
Speed of plate [m.s-1]
1 Theoretical course Semtex S30
1
2 Area of measured data Semtex S30
2
3
3 Area of measured data S012K
weight of explosives / weight of plate = 2.0
Trajectory [mm]
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sn
Sn
Cu
Al
Sn
Steel
D = 1400 m.s-1
Sn
Sn
Mosadz
Brass
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sn
Steel
Sn
Steel
Microstructure of bimetal steel – Sn
D = 1181 m.s-1
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sn
Sn
Al
Al
Microstructure of bimetal Al – Sn
D = 1181 m.s-1
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sn
Brass
Sn
Brass
Microstructure of bimetal Brass – Sn
D = 1413 m.s-1
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Sn
Sn
Cu
Cu
Microstructure of bimetal Cu – Sn
D = 1181 m.s-1
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EXPERIMENTAL PROCEDURE
AND MATERIALS
1 mm Sn
D = 1238 m.s-1
4 mm Sn
D = 1418 m.s-1
Explosive welding of Cu – Sn
samples
Thickness Sn from 1 to 12 mm
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Melting of Sn – Sn interface
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Melting of Sn – Sn interface
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EXPERIMENTAL PROCEDURE
AND MATERIALS
Cu – Sn bimetal
Crack on the interface Cu – Sn by simultaneous cladding of two Sn layer
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TEST RESULTS
 Cladding of tin with others metal materials by
using explosives with detonation velocity not
exceeding 1500 m.s-1, optimum max. 1200 m.s-1
 Selected metal materials are possible cladding by
tin
 It is possible to clad tin in various thickness
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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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THANK YOU FOR YOUR
ATTENTION
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