One-dimensional detonation model and two-dimensional P-M (Prandtl-Meyer) expanding model of double vertical ex-plosive welding were established. A one-dimensional formula of lfyer plate velocity was obtained and the bending angle curve rep-resenting lfying attitude of lfyer plate in double vertical was deduced as well. Compared with single parallel explosive welding, the double vertical explosive welding combines two cladding plates in one explosion. Due to closed charging structure, the inlfuence of rarefaction wave on the plate's surface in double vertical explosive welding is eliminated and explosion loading time and displace-ment are increased, resulting in the increase of lfyer velocity and energy utilization rate by 1.3 times to 1.6 times in different mass ratios. The analysis of microstructure in bonding zone of double vertical cladding plate under traditional charging shows that there is a clear over-melting near the interface, which is in line with the conclusion of detonation mechanism.
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