Explosive welding technique is widely used in many industries. This technique is useful to weld different kinds of metal alloys that are not easily welded by any other welding methods. Interlayer plays an important role to improve the welding quality and control energy loss during the collision process. In this paper, the Ti6Al4V plate was welded with a copper plate in the presence of a commercially pure titanium interlayer. Microstructure details of welded composite plate were observed through optical and scanning electron microscope. Interlayer-base plate interface morphology showed a wavy structure with solid melted regions inside the vortices. Moreover, the energy dispersive spectroscopy analysis in the interlayer-base interface reveals that there are some identified regions of different kinds of chemical equilibrium phases of Cu–Ti, i.e. CuTi, Cu₂Ti, CuTi₂, Cu₄Ti, etc. To study the mechanical properties of composite plates, mechanical tests were conducted, including the tensile test, bending test, shear test and Vickers hardness test. Numerical simulation of explosive welding process was performed with coupled Smooth Particle Hydrodynamic method, Euler and Arbitrary Lagrangian-Eulerian method. The multi-physics process of explosive welding, including detonation, jetting and interface morphology, was observed with simulation. Moreover, simulated plastic strain, temperature and pressure profiles were analysed to understand the welding conditions. Simulated results show that the interlayer base plate interface was created due to the high plastic deformation and localized melting of the parent plates. At the collision point, both alloys behave like fluids, resulting in the formation of a wavy morphology with vortices, which is in good agreement with the experimental results.

爆炸焊接技术广泛应用于许多行业。这种技术可用于焊接其他任何焊接方法都不容易焊接的不同种类的金属合金。夹层对于提高焊接质量和控制碰撞过程中的能量损失具有重要作用。在本文中，Ti6Al4V 板在存在商业纯钛夹层的情况下与铜板焊接。通过光学和扫描电子显微镜观察焊接复合板的显微组织细节。夹层-基板界面形态呈现波浪状结构，涡流内有固体熔化区域。此外，层间界面的能量色散谱分析表明，存在一些已识别的不同种类的 Cu-Ti 化学平衡相区域，即 CuTi，₂ Ti、CuTi ₂、Cu ₄Ti等。为了研究复合板的力学性能，进行了力学试验，包括拉伸试验、弯曲试验、剪切试验和维氏硬度试验。采用耦合光滑粒子流体动力法、欧拉法和任意拉格朗日-欧拉法对爆炸焊接过程进行数值模拟。通过仿真观察了爆炸焊接的多物理场过程，包括爆炸、喷射和界面形貌。此外，还分析了模拟的塑性应变、温度和压力曲线，以了解焊接条件。模拟结果表明，由于母板的高塑性变形和局部熔化，产生了夹层底板界面。在碰撞点，两种合金都表现得像流体，