Permanent electrical contact applicable to the web of rails and the like

Method of making an electrical contact applicable to the web of rails and the like, the electrical contact comprising a bush in electrically conductive material having a tubular stem insertable in a hole in the web of a rail, a flanged head radially widened compared to the stem and suitable for engaging in abutment with a portion surrounding the hole, and an axial through hole in which a punch can be inserted to expand the tubular stem radially and join a radially outer surface of the stem closely with the hole, wherein the bush consists of a double layer tubular body having an outer layer substantially made from the first conductive metal and an inner layer together with at least a portion of the flanged head substantially made from the second conductive metal,

• the method comprising the steps of:
• providing a section of double layer tube having an outer layer made from a first conductive metal and an inner layer made from a second conductive metal different from the first conductive metal,
• inserting the section in the mould of a press,
• carrying out a cold deformation to shape the tubular stem and the flanged head radially widened compared to the tubular stem, wherein the outer layer forms the radially outer surface of the tubular stem and the inner layer forms a front contact surface of the flanged head opposite the stem.