1. Product description
The preparation of titanium clad steel bimetal tube sheet essentially belongs to the connection problem between titanium and steel. The analysis of the connection between titanium and steel can provide guidance for the subsequent improvement of the interface bonding quality of titanium clad steel plate bimetal tube sheet. At present, the common connection methods of titanium and steel are fusion welding, explosive welding, brazing, diffusion welding, friction welding, pressure welding, etc. Compared with the connection of titanium and steel, the connection of titanium and steel is more difficult, which is mainly reflected in the differences in physical and chemical properties between titanium and steel.
2. Product Features
The minimum distance between plates is 15m when the delay time is 25ms; When the delay time is 50 ms, the minimum distance between plates is 30 m; When the plate spacing is less than the minimum spacing, the composite plate will have poor bonding or even no bonding. In the practice of explosive compound production, when delay detonators are used for initiation, it is necessary to ensure that the plate spacing is greater than the minimum plate spacing corresponding to the selected delay time. The experimental results show that there is no significant difference in the quality of titanium steel composite plates produced by delay detonators and instant detonators, with a delay of 25 ms, a minimum plate spacing of 15 m, a delay of 50 ms, and a minimum plate spacing of 30 m. The properties of titanium steel composite plates produced can exceed the shear strength of 137.9 MPa specified in ASTM B898.
3. Application of the titanium clad steel bimetal tube sheet
Explosive welding technology provides a rare method for maintaining and making full use of some important equipment and parts ‚ If a thin layer of metal is coated by explosion ‚ To repair the plane and internal and external cylindrical surfaces of large and medium-sized components ‚ Or increase the thickness ‚ Or fill in the dimensional tolerance ‚ Or repair internal and external defects ‚ The components to be scrapped shall be renovated and reused. Explosion welding blockage of damaged heat transfer tubes of heat exchangers, especially nuclear reactor heat exchangers. Combination of explosive welding and explosive forming ‚ To produce bimetallic heads and dished tube sheets. Explosive welding is combined with common metal pressure processing processes such as rolling, stamping, forging, extrusion, spinning, and drawing ‚ To produce larger, thinner, longer, thinner, thicker, and profiled composites. For example, explosive welding, rolling, stamping, and drawing are used to obtain ‚ First class two-layer cylindrical and three-layer profiled contact materials.
4. FAQ
After the repair welding of the titanium layer is completed, the welded joint is cut by wire, and then the welded joint is corroded by a solution composed of hydrofluoric acid, nitric acid, and water. The macro, hardness, and microstructure of the welded joint are checked by a Vickers hardness machine and metallographic microscope. The boundary between the titanium layer and carbon steel layer of clad tubesheet is obvious, and the repair welding seam of titanium layer is uniform, without cracks, incomplete fusion, and other defects. The Vickers hardness test of titanium layer was carried out with a test force of 10 kgf. The results showed that the hardness of the base metal of the joint, the heat affected zone and the weld zone had little difference, but the hardness of individual positions of the weld was on the high side.
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