In this method of implementation, no deflashing is carried out.In the particular case of a section 10 cut in the wall of the pipe, for example in order to make a hole for the purpose of tapping off another pipe, use is made, as nay be seen in FIG. 5, of a washer 40 which is intended to be fitted into thesection and to perfectly match its contours, the washer having a height equivalent to the thick