The invention relates to an ultrasonic field auxiliary vacuum
diffusion connecting device and method, aims at solving the problems that according to an existing vacuum
diffusion connecting method, the requirement for a
joint surface is strict, a surface oxidization film is hard to remove, the connecting time is long, and connecting temperature reduction and deformation resistance reduction cannot be combined, and belongs to the technical field of
diffusion connection. The device comprises an upper pressing head, an upper pressing plate, an upper sample, a lower sample, a lower pressing plate, supporting devices, an ultrasonic tool head, a
vacuum chamber and a heating body. The method comprises the steps that to-be-welded
base metal is cleaned; the to-be-welded
base metal is assembled and placed in the
vacuum chamber, the pressure is exerted, and the temperature is increased to the connecting temperature;
ultrasonic vibration is exerted; and the pressure is increased, and insulating is completed. The deformation resistance of the
base metal is reduced, breaking of a surface oxidization film of the base
metal is accelerated, the diffusion behavior is accelerated, the connecting temperature and the connecting pressure are reduced, the connecting time is shortened, and the requirement for the surface state of the to-be-welded base
metal is lowered.