| 摘要 |
<p>The method comprises progressively feeding a metal strip (1) having two parallel longitudinal edges, shaping the metal strip in a U-shaped gutter by connecting the longitudinal edges, introducing filling elements (2) into the gutter, shaping the gutter filled with the filling elements and pre-yarn in a tubular form by bringing its longitudinal edges into contact or near contact to each other, and welding the longitudinal edges of the pre-yarn by a laser beam (4), where a protective screen is maintained between an impact site of the laser beam and the filling elements during the welding step. The method comprises progressively feeding a metal strip (1) having two parallel longitudinal edges, shaping the metal strip in a U-shaped gutter by connecting the longitudinal edges, introducing filling elements (2) into the gutter, shaping the gutter filled with the filling elements and pre-yarn in a tubular form by bringing its longitudinal edges into contact or near contact to each other, and welding the longitudinal edges of the pre-yarn by a laser beam (4), where a protective screen positioned within the pre-yarn is maintained between an impact site of the laser beam at the longitudinal edges and the filling elements during the welding step. The protective screen comprises an arched upper surface positioned in a front of an inner wall of the pre-yarn, and has a shape of tile. The protective screen is cooled by a refrigerant liquid and forms a mechanical protection preventing that the laser beam does not strike the filling elements. The protective screen is carried by a mechanical system to move or direct the protective screen according to and/or compared to an axis of the pre-yarn and equipped with a measurement unit (12) to measure electrical resistance within the protective screen. An independent claim is included for an installation for fabricating a yarn.</p> |
