Hydrokinetic coupling device with a blade driving member, particularly for motor vehicles

A hydrokinetic coupling apparatus for a motor vehicle, comprising a generally transversely oriented wall (2) which is adapted to be coupled in rotation to a driving shaft and which carries a guide ring (6) fixed centrally thereto, a piston (9) mounted sealingly for axial movement along the guide ring (6) and defining, with the ring (6) and the transverse wall (2), a variable volume chamber (30) which is bounded on the outside by a disc (10), and friction liners (11) which are adapted to be gripped respectively between the piston (9) and the disc (10), and between the disc (10), and the transverse wall (2), each friction liner (11) being fixed to one of the elements, including the disc (10), the piston (9) and the transverse wall (2), between which it is adapted to be gripped, wherein the piston (9) is coupled in rotation to the transverse wall (2), with axial mobility, by means of interposed tangential resilient tongues (40) fixed to a driving member (44), wherein the driving member (44) for the tongues (40) is fixed by laser transparency welding to the transverse wall (2), and the driving member (44) is included in advance in a sub-assembly which also comprises the tangential tongues (40) and the piston (9).