Coil for the magnetic-pulse welding of tubular parts and related welding method

A coil to magnetic-pulse weld tubular parts comprising an active portion of which a peripheral surface is positionable to face a working zone of a mutual overlap zone of the tubular parts, the peripheral surface defines a zone in a form of a tubular aperture elongated in an axial direction and having a predetermined axial length, the tubular aperture has, in the axial direction, over the predetermined axial length of the peripheral surface, two sections of constant cross section linked together by a section of monotonically increasing cross section.

A method for magnetic-pulse welding of two tubular parts, comprising the steps of:

• arranging the two tubular parts relative to one another to form a working zone, facing a peripheral surface of a coil such that an end of one of the tubular parts is positioned at a level of a smallest cross section of a tubular aperture, the peripheral surface defines a zone in a form of a tubular aperture elongated in an axial direction and having a predetermined axial length, wherein the tubular aperture has, in the axial direction, over the predetermined axial length of the peripheral surface, two sections of constant cross section linked together by a section of monotonically increasing cross section;
• and
• subjecting the working zone to a magnetic field such that a pressure is exerted on a wall of one of the tubular parts to press against a wall of other tubular part to provoke a permanent bonding thereof.