Base plate and doubling plate expansion method in explosion welding of large-thickness oxygen-free copper doubling plate

The invention discloses a base plate and doubling plate expansion method in explosion welding of a large-thickness oxygen-free copper doubling plate. The expansion method comprises the steps that (1) continuation plates are additionally arranged on a base plate and a doubling plate correspondingly; (2) the dimensions of the continuation plates are determined based on calculation of the thicknesses of the base plate and the doubling plate and adopted-explosive parameters; (3) the doubling plate and the continuation plates are connected through bolts; and the connecting mode between the base plate and the continuation plates is determined according to the material of the base plate, wherein, the thickness h of the oxygen-free copper doubling plate is larger than or equal to 15 mm, and the thickness of the base plate is larger than or equal to 1.0 h. According to the base plate and doubling plate expansion method in explosion welding of the large-thickness oxygen-free copper doubling plate, the strength and the