In this paper,processing technology for free electromagnetic bulging of LF3 Al alloy tube and effects of major parameters
on final profile of the tube are investigated. It is indicated that the final tube profiles are influenced greatly by charged energy, various material protecting tubes, discharge
frequency and the tube length to be formed.Final profiles of the tubes can be controlled by adjusting those parameters.The middle profile of the tube is cylindrical, and with increase of charged energy and discharge frequency, the radial deformation of the tube is also
increased. The edge profile of the tube can be changed from cone to bell shape when protecting tube material resistance becomes higher.The cylindrical length of middle tube becomes increased with formed length,but the edge profile of the tube almost keep the same cone or bell shape. When the formed length is longer than 40 mm, the deformation at tube edge and near fixer is almost the same and has no relations to the length to be formed if the same energy is provided.