Transcript Document

EXPLOSIVEE WELDING OF LARGESIZE SHEETS: SEAM QUALITY ISSUES
O.L. Pervukhina, T.A. Shishkin, I.V. Denisov, and L.B. Pervukhin
(Russia)
Institute of Structural Macrokinetics and Materials Science RAS
(ISMAN), Academician Osipyan str., 8, Chernogolovka, Moscow
Region, 142432, RUSSIA
Methods of testing the quality of the resulting
explosion welding seam
Ultrasonic testing
Experimental study of wave generation
We explored the quality of explosive welding of steel (09G2S) to titanium alloy (VT1-0)
carried out at –15C with large sheets 31.5(26 + 5.5)  3300  3700 mm in their dimensions.
Metallographic specimens 25 and 100 mm wide were cut from the welded sheet at a pitch
of 300 mm; Measuring the size of the waves was performed using the magnifying glass
Brinell.
The pull strength of the seam was found to vary between 210 and 350 MPa
Sheets elongation and Wavy structure of weld seam
as a function of sheet length L
wave height
Sheets elongation
repers
L,
mm
= 0.12 . . .0.24 mm
L,
mm
The sample for the study
The results of ultrasonic testing
8000 mm stable wave structure
h = 0. . .1 mm
h = 0.12 . . .0.24 mm
The size of the shock-compressed gas area / sheet length
0.40000
0.35000
0.30000
0.25000
l, м
shock-compressed gas area, m
12900
s 0b
l
0.20000
0.15000
1b  2
0.10000
s
vк
 2 
2
P11 

 1


1


2
 1
0.05000
0.00000
0.0
1.0
2.0
3.0
4.0
5.0 S, м 6.0
7.0
8.0
9.0
10.0
11.0
sheet length, m
ρ0 – density of flowing gas, b – length of the contact line, P1 – pressure in the shock-compressed gas, Vк – contact point velocity,
 - velocity of the gas, l - extent of the zone of shock-compressed gas, s – distance from the contact point
Investigation of the structure of the cladding sheet defective portion
2 layer
bright,
brilliant
plastic
1 layer
dark
fragile
1 layer microstructure
1
2
3
4
C
5.31
6.01
3.42
2.13
O
Na
22.60
37.08 2.00
41.64 1.45
43.10
Al Si
Cl
Ti
1.06 1.05
0.44
0.86 2.31
1.41
1.30
1.19
Cr Mn
7.06 1.05
3.44
1.02 1.21
0.71
Fe Ni
52.41 9.01
47.25 1.04
48.54
52.86
2 layer microstructure
2 layer microstructure
O
Al
Si
Cr
Mn
Fe
Ni
Total
1 0.61 0.59 0.42 7.17 1.23
86.78
3.20
100.00
2 1.30 1.81 1.11
92.97
0.24
100.00
0.84 1.73
Сonclusions
• If the length of the field of shock-compressed
gas increases the heating time of welded
surfaces. This leads to rapid melting of the
welded surfaces and halting the wave
formation.