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EXPLOSIVEE WELDING OF LARGE-SIZE SHEETS: SEAM QUALITY ISSUES

EXPLOSIVEE WELDING OF LARGE-SIZE 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.

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EXPLOSIVEE WELDING OF LARGE-SIZE SHEETS: SEAM QUALITY ISSUES

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  1. EXPLOSIVEE WELDING OF LARGE-SIZE 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

  2. Methods of testing the quality of the resulting explosion welding seam Ultrasonic testing

  3. 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

  4. Sheets elongation and Wavy structure of weld seam as a function of sheet length L repers Sheets elongation L, mm = 0.12 . . .0.24mm wave height L, mm

  5. The results of ultrasonic testing The sample for the study 8000mmstable wave structure h = 0. . .1mm h = 0.12 . . .0.24mm 12900 shock-compressed gas area, m The size of the shock-compressed gas area / sheet length sheet length, m ρ0 – density of flowing gas,b – length of the contactline, P1 – pressure in the shock-compressed gas,Vк – contactpointvelocity,  - velocity of the gas, l - extent of the zone of shock-compressed gas, s – distance from the contactpoint

  6. Investigation of the structure of the cladding sheet defective portion 2 layer bright, brilliant plastic 1 layer dark fragile

  7. 1 layer microstructure

  8. 2 layer microstructure

  9. 2 layer microstructure

  10. 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 surfacesand halting the wave formation.

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