EXPLOSIVE WELDING OF LARGE BRASS/STEEL SHEETS

I.V. Denisov, O.L. Pervukhina, L.B. Pervukhin (Russia)

Institute of Structural Macrokinetics and Materials Science RAS (ISMAN), Academician Osipyan str., 8, Chernogolovka, Moscow

Region, 142432, RUSSIA

Influence of parameters on the seam quality

Boundary conditions of the connection with explosion welding metals

r –the mass ratio of explosive charge the weight of the plateD - detonation velocity γ - the angle of impact

Vк

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100(14+86)×1100×2100 mm

The experimental resultsbrass L63 (14 mm thick)

Cladding sheet - brass L63

Main sheet - steel 09G2C

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On a sheet of brass has gray coating

On a sheet of steel has a yellow coating

The structure of the porous layer on the brass surface(length greater than 1 m after the explosion welding)

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The surface of the porous layer

A cross section of the porous layer on the brass surface of

Surface

The composition and structure of the porous layer

Spectrum C O Al Si Fe Cu Zn Total1 7.90 13.57 1.20 2.71 0.40 0.82 73.18 100.002 10.76 2.98 0.82 0.34 1.22 83.88 100.003 28.83 29.44 1.04 2.82 2.02 3.28 32.58 100.004 5.78 3.42 1.23 1.53 54.02 34.02 100.005 1.57 1.30 0.27 2.57 45.96 48.32 100.006 8.62 4.56 1.10 0.84 0.76 84.11 100.00

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C O Mg Al Si Cr Mn Fe Cu Zn Sn

1 4.00 0.50 1.25 3.83 54.81 35.62

2 3.17 0.40 1.07 1.35 83.09 9.19 1.73

3 3.30 0.54 1.86 5.92 65.22 22.25 0.91

4 6.64 28.29 0.59 0.86 25.99 2.53 35.10

5 4.82 24.61 0.47 0.84 20.47 9.30 38.80 0.67

6 1.57 28.60 0.94 0.59 0.82 56.53 0.97 9.97

7 9.30 12.86 18.83 0.19 3.90 1.13 23.51 13.83 16.46

8 4.11 0.72 1.12 84.65 5.76 3.64

9 5.88 3.85 15.56 61.81 8.23 4.65

Microsection

The distribution of elements in the cross section

Spectrum C O Al Si Fe Cu Zn Total1 21.04 0.99 0.73 0.43 49.31 16.56 10.94 100.002 22.22 0.91 0.81 0.46 40.20 21.93 13.47 100.003 24.26 0.89 0.72 - 2.88 44.00 27.26 100.00

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The distribution of elements in the porous layer

Распределение Cu Распределение Zn Распределение Fe Распределение O

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The phase diagram of Cu-Zn 9

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м/сγ, °

Parameters of the shock-compressed gas

Zone length shock-

compressed gas, m

Exposure time of shock-compressed gas, s

Pressure p1,

Па

TemperatureТ1,

°Кl(1м) l(2м) t(1м) t(2м)

2500 9 6,7×106 2718 0,094 0,144 37,6×10-6 57×10-6

3200 10 11,1×106 4351 0,091 0,14 28×10-6 44×10-6

4000 13 18,3×106 7007 0,09 0,137 22×10-6 34×10-6

4200 16 22,2×106 8450 0,089 0,137 19,8×10-6 30×10-6

Parameters of the shock-compressed gas at various modes of explosion welding for Brass + Steel

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The brass surface becomes warmed-up above the melting point of brass and boiling point of Zn. The moving shocked gas entrains Zn vapor, the particles of fused Cu, Fe and also their oxides. Due to gravity-assisted separation, the Zn vapor and its oxides go upward while the fine particles of melted brass and steel, downward. Upon contact with the metal surface, Zn and its oxides get deposited onto the steel surface while melted brass particles, on the steel surface.

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Ready billet for tube plates

The results of experimental testing of welding explosion bimetal

brass + steel (L63 +09 G2S)100 (14 +86) × 1100 × 2300 mm

Experiment

Thanks for your attention!