the invention concerns methods and devices for bending a cylindrical tube or the like so as to obtain two consecutive sections of said tube forming between them a non - null angle alpha . the method is essentially characterised in that it consists in producing , in the wall of the tube , a wave defined between two flanks forming between them a non - null angle beta substantially centred on the separation plane between the two sections , then in producing a permanent plastic deformation of the wave until the value of the angle between the two sections is obtained . the device enables to implement said method . the invention is useful in particular but not exclusively , for producing pipes for transporting fluids in motor vehicles or the like .