Underwater explosive welding, Discussion based on weldable window

A new method of underwater explosive welding is introduced and its possibilities are suggested. In the underwater explosive welding, a high explosive with detonation velocity of 7km/s is placed at an initial inclined angle to decrease the horizontal collision point velocity, which is one of the important parameters to achieve welding. This method is effective to accelerate a thin metal plate rapidly. However, this arrangement makes a difference in the welding conditions with horizontal position when a constant thickness explosive is used, as the propagation distance of the underwater shock wave increases at the ends. Hence, a method of linearly increasing the thickness of explosive in proportion to the propagation distance is proposed. This investigation intends to clarify the welding conditions in using a constant thickness explosive and linearly increasing thickness explosive based on numerical analysis. Further, a method of designing the assembly is confirmed through numerical analysis and its validity with the experimental results is demonstrated based on the welding window.