The invention provides an electromagnetic connecting device and method suitable for a low-
conductivity metal pipe fitting, and belongs to the technical field of
metal pipe fitting connection. The device is mainly composed of an electromagnetic connection module and a
power module, the electromagnetic connection module comprises a connection coil, an inner tube, a low-
conductivity outer tube and a driving tube, and the connection coil generates an alternating
magnetic field under excitation of
pulse current provided by the
power module, so that the driving tube induces
eddy current and generates electromagnetic repulsive force and attractive force; the power supply module is used for providing
pulse current excitation for the connecting coil. According to the working principle, firstly, the driving
pipe is made to generate radial shrinkage deformation through electromagnetic repulsive force, and then the outer pipe and the inner pipe are extruded to form mechanical connection or
welding; and then the driving pipe is subjected to reverse bulging deformation through electromagnetic attraction force to be automatically separated from the connecting structure, and finally only stable connection between the inner pipe and the outer pipe is reserved. The device has the characteristics of reliable connection, simple operation, wide applicability and the like.