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Vortex holes at the welding interface will affect the interface sealing performance of the explosive welding clad plate, so in the production process to choose the appropriate parameters to avoid the production of vortex holes. The step method is used to study the titanium-copper explosive welding clad plate interface vortex holes generation and interface ripple morphology change law under different stand-off distances. Experimental results show that the shear strength of the welding interface, the wavelength and amplitude of the ripple are positively correlated with the stand-off distance. The closer to the interface, the greater the hardness; the presence of dislodged metal blocks in the melt zone leads to no significant increase in hardness. When the stand-off distance is 4 mm ( β = 16 ∘ , V p = 779 m / s ), the least amount of intermetallic compounds is generated at the interface. When the stand-off distance is not more than 8 mm ( β ≤ 19 ∘ , V p ≤ 947 m / s ), there are no vortex holes on the interface. The welding process is simulated by the smooth particle hydrodynamics method in AUTODYN. The numerical simulation results show that the main component of the jet is titanium; numerical simulation can well predict the ripple shape of the welding interface. [ABSTRACT FROM AUTHOR]

Large-scale explosive welded composite plates are important materials for nuclear fusion reactor vessels, and have high requirements for mechanical properties and crack detection tests. In order to meet the requirements, titanium/steel explosive welded composite plates were manufactured under different gas media, and the effect of gaseous media on the interfacial microstructure and mechanical properties of the composite plates was evaluated. The results show that there are significant differences in the interface morphology and mechanical properties of the explosive welded composites under different gaseous media. Unlike traditional explosive welding under air, a low density helium medium smooths the welding process and creates a more stable periodic wave at the interface. In addition, helium gas as an inert gas effectively inhibits the formation of oxides at the interface and improves the mechanical properties and welding quality. [ABSTRACT FROM AUTHOR]