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TUBULAR ITEMS EXPLOCLAD WITH Ti O. L. Pervukhina , I.V.Saikov and L. B. Pervukhin

Influence of explosion welding technology parameters on the titanium structure. EXPLOSIVE WELDING OF LARGE-SIZE TITANIUM–STEEL SHEETS: INFLUENCE OF AMBIENT GAS А. А. Berdychenko, L. B. Pervukhin, and O. L. Pervukhina.

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TUBULAR ITEMS EXPLOCLAD WITH Ti O. L. Pervukhina , I.V.Saikov and L. B. Pervukhin

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  1. Influence of explosion welding technology parameters on the titanium structure EXPLOSIVE WELDING OF LARGE-SIZE TITANIUM–STEEL SHEETS: INFLUENCE OF AMBIENT GASА. А. Berdychenko, L. B. Pervukhin, and O. L. Pervukhina TUBULAR ITEMS EXPLOCLAD WITH TiO. L. Pervukhina, I.V.Saikov and L. B. Pervukhin 2010

  2. Report plan 1. Influence of ambient gas in technological gap on the titanium structure. 2. Features titanium structure at its volume deformation defined by the size of welding gap.

  3. 2 Research technique 1 electric detonator; 2 explosive; 3 clad plate ; 4 base plate ; 5 starting sensor; 6 shutdown sensor of the fist frequency meter; 7 shutdown sensor of the second frequency meter; 8 connectingcables; 9 frequency meters; 10 power supply 1 Explosive; 2 electric detonator; 3 titaniumclad plate, thickness is 5 mm; 4titaniumbar, thickness is 5 mm; 5 titaniumbase plate, thickness is 5 mm. Research methods TEM, X-ray, lasermass-spectograph

  4. 3 AirD=3940 - 1880 m/s Vк=3980 m/s. Change of concentration of oxygen СО (а) и nitrogenСN (б) in metal of vortical zones Vк=1880 m/s. 1 Vк=3980 m/s; 2 Vк=2640 m/s; 3 Vк=1880 m/s.

  5. 4 D=2690 м/сNitrogenOxygen Change of gas(Сг)concentration in a material of vortical zones of welded connections received in the environment of oxygen (1) and nitrogen (2)

  6. 5 D=2690 м/с ArgonHelium Welding in the environment of inert gases of argon and helium considerably improves structure of welded joint, raises its plasticity and stabilizes quality of welded joint along the full area regardless of its sizes. The best quality and stability of properties provides with filling of technological gap with helium.

  7. 8 Ti+Steel The technology of large-size two-layer sheets (Steel + Titanium) manufacture by explosion welding was developed and patented. The technical conditions “Two-layer intermediates Steel+Titanium produced by explosion welding” were formalized and conformed to Gosatomnadzor. Trumpet lattices of condensers are produced from two-layer clad in OAO «Kaluga turbine factory ».

  8. 7 Ti+Steel Microstructure Steel 10 + Titanium ВТ1-0 welded by explosion in argon atmosphere. The beginning of process 2800 mm from the beginning of welding process Grade of bimetal, sizes, mm Durability of joint, MPa Tests, degree Tearing off Shear Bend Lateral bend More 80 More 80 More 80 More 80

  9. 9 Problems at manufacture of long-length cylindrical copper - titanium details by explosion welding : 1. Instability of process at length over 250 mm 2. Occurrence of cracks in clad layer; 3. Formation of intermetallic phases and titanium into a joint zone. Choice of technological gapsize : - Thermodynamic conditions of qualitative joint formation (temperature, pressure, time) must be provided. - It is necessary to exclude conditions of deformation localization in the titanium and cracks formation. - It is necessary to take into account the possible fluctuation of technological gap in the limits with length of units.

  10. 10 Deformation features of a titanium pipe at explosive compression Explosive Experiments spent on cylinders from titanium pipe with the size of grain 25 microns. Length of 70 mm, external  20 mm,internal 11 mm titanium steel

  11. 11 Titanium microstructure at different deformations after shock-wave loading. Development of a localization strip Critical parameter of localization The size of grain

  12. 12 Cladlong-length copper bars by a titanium pipe • To except cracks formation in Ti the size of technological gap should provide the relative volumetric cylinder deformation no more than 0,22. • 2. To quench a deformation localization in Ti it is necessary to provide heating of the surface layer to the temperature of plastic state. 3. To save the thermodynamic conditions of explosion welding it is necessary to except titanium burning in a gap by means of its filling with inert gas. 1- Copper core 2 - titanium pipe 3 - The top cover 4 - The bottom cover 5 - Technological gap 6 - Explosive 7 - Sand 8 - Detonator

  13. 13 Titanium deformation on the end sites of intermediates Intermediate Ti+Cu for a contact jaw Copper bar 25 mm, l = 1000 mm Titanium pipe wall thickness is 2.5 mm The relation of length to diameter = 33 r=0.6. Change of deformation mechanism of titanium during explosive loading is revealed r=0.6. r=0.1

  14. 14 Conclusion: The experimental technology of long-length Ti+Cu bars manufacture by explosion welding providing 100% joint continuity and necessary electrical resistance of joint zone was developed under the research of deformation features of titanium pipe and influence of ambient gas in the welding gap.

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