The goal of this research is to study the influence of the ratio of an explosive composed of 80% ANFO and 20% matrix on the quality of dissimilar explosive welds of Cu-DHP copper to aluminium alloy 5083-H11, in flat configuration. It is analysed the influence of four explosive ratios (1.4, 1.8, 2.3 and 2.6) on the microstructure and mechanical properties of welds. It was observed that the increase in the explosive ratio gives rise to an increase of the collision point velocity (Vc) and the impact velocity (Vp) and consequently reduces the thickness of the flying plate after welding as well as produces wavy interfaces of greater amplitude. Microstructural analysis showed the formation of hard and brittle intermetallic compounds in the interface region, more obvious in welds made with higher ratio of explosive.
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Effect of explosive ratio on explosive welding quality of copper to aluminium
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a CEMUC – Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal
b ADAI – Assoc. for Dev. of Ind. Aerodynamics, LEDAP Lab. Energetics and Detonics, Department of Mechanical Engineering, University of Coimbra, Rua Luis Reis Santos, Polo II, 3030-788 Coimbra, Portugal
c ESAD.CR, Polytechnic Institute of Leiria, Rua Isidoro Inácio Alves de Carvalho, 2500-321 Caldas da Rainha, Portugal
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Abstract
Keywords:
Explosive welding
explosive ratio
copper
aluminium
intermetallic phases
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