Science and Technology of Energetic Materials

Vol.63, No.5 (2002)

Research paper

Explosive welding of thin metal plate onto a base plate using regulated underwater shock wave
- As application for surface modification of various materials -
Kazuyuki Hokamoto, Yasuhiro Ujimoto, Shojiro Ohama, and Mashiro Fujita


A novel explosive welding technique using regulated under water shock wave is developed and the possibility for the application is discussed. The assembly is used to accelerate a thin metal plate uniformly at a high velocity to satisfy the condition of explosive welding systems. In the present investigation, a high explosive SEP, (detonation velocity = 7.0 km / s), is employed. Consequently, an inclined set-up angle of the explosive packing is required to decrease the horizontal collision point velocity. Since the reliability and bonding strength for the explosively welded joint are very high, the present method can be effectively used to mnodify the surface of various materials. Thin plates are welded successfully and multi - layered explosive welding is also suggested. For the explosive welding of metal plates, wavy interface, a characteristic feature, is observed at the bonded interface. Nonetheless, the sizes of the waves vary from the detonation location towards the farther end of the plates. This is caused due to the decrease in the shock pressure applied to the flyer plate. The success of the explosive welding process is highly sensitive to the welding ambience and hence the parameters should be carefully selected. Explosive welding of difficult - to - weld materials is also reported.

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