1997 Volume 15 Issue 4 Pages 615-622
In this study, aluminum and copper tubes (diameter : 10mm, thickness : 0.5mm) were welded to some kinds of bars by MIW (Magnetic Impulse Welding). The joints welded by MIW were evaluated by water tightness test, tension test and microscopic observation. The most suitable clearance between tubes and bars was 0.5mm for welding under the charged voltage of 14.0±2.5 kV, and it was not dependent on kinds of tubes and bars. Aluminum tubes could be welded with wider clearance than copper tubes, because the plastic deformation of aluminum tubes was easier than that of copper tubes. As bars were harder, tubes were welded better. Degreasing the welded interface had an effect on welding strength. The regular wavy pattern was observed on the welded interface. Microvickers hardness increased as approaching to the welded interface from the base metal of tubes and bars.