Field concentrating device for improving connecting effect of magnetic pulse welding joint

The invention discloses a field concentrating device for improving the connection effect of a magnetic pulse welding joint, and belongs to the field of field shapers. The field concentrating device comprises a field shaper and an opening gap arranged on the field shaper; the field shaper is of a columnar symmetrical structure, and a through hole for allowing a workpiece to be placed is formed in the middle of the field shaper; and the opening gap communicates with the inner wall and the outer wall of the field shaper, and the opening gap is externally tangent to the inner wall of the field shaper. The opening gap is externally tangent to the inner wall of the field shaper, and the angle of the opening gap is changed, so that the magnetic field force intensity loss at the opening gap is reduced to the minimum, then the circumferential length of the magnetic pulse welding joint is increased, the defects generated by a traditional opening are overcome, and the circumferential connection uniformity of the welding