ABSTRACT: Some experimental observations had been made on the metallurgical and mechanical properties of the explosive clad joints for various combination of stainless steel, Cu flyer plate and steel, Cu and Al parent plates. Arrangement of experimental facility such as line wave lens, explosives am lay-out were discussed. Ultra-high speed photography was also adopted to measure physical characteristics in bonding process. From the experiments, optimum welding parameters and heat treatment conditions were established. The manufactured clad plates seemed to be sufficient for practical application, but SUS/Cu and Cu/Al clad plates had some possibilities of weak interface. Hardening of joint interface was believed to be caused by the plastic deformation. Change of hardness after heat treatment was explained by the metallurgical behaviors such as recrystallization, precipitations and intermetallics.
INTRODUCTION Explosive clad plates have been supplied in a wide range of applications to meet the current market demand in the manufacture of process equipment for the chemical, petrochemical and petroleum industries. When the explosive clad plate is used as a transition joint, it may be welded and experienced a high temperature heating cycle. Consequently various phenomena, are which might have influence on the service properties of transition joints, expected to occur. Several investigations (Fukui, Namba and Sugiyama, 1970, Tatsukawa and Oda, 1972, Murakami and Nishida, 1972, Kuriyama, Kawashima and Kubomura, 1975, Levchenko and Kuzyukov, 1986) dealing with the change of metallurgical and mechanical properties on heating of explosively clad plates were reported, whereas little information is available for the various kinds of explosive clad plates and the accompanied changes at the joint interfaces. However, much discussions may have been remained on the metallurgical and mechanical properties at the microsections around the joint interface, and they should be examined closely for the reliable applications of these plates.