System for creating a melting zone with addition of material in an ambient liquid

摘要

The system comprises a laser head (1) adapted to create a melting zone (311) on a surface (31) of a workpiece (3) to be welded and to be charged, and an inlet (2) that is made of a material and is provided in the melting zone. The workpiece and the laser head are placed in an ambient liquid (4). The laser head comprises a nozzle adapted to project a liquid to the surface of the workpiece for forming a protective curtain against the ambient liquid surrounding the melting zone. The inlet comprises shoes (21) adapted to pass through the protective curtain. The system comprises a laser head (1) adapted to create a melting zone (311) on a surface (31) of a workpiece (3) to be welded and to be charged, and an inlet (2) that is made of a material and is provided in the melting zone. The workpiece and the laser head are placed in an ambient liquid (4). The laser head comprises a nozzle adapted to project a liquid to the surface of the workpiece for forming a protective curtain against the ambient liquid surrounding the melting zone. The inlet comprises shoes (21) adapted to pass through the protective curtain and to be in contact with the surface of the workpiece through which the material is fed towards the melting zone. The shoes comprise a leading edge adapted to intersect the protective curtain, two trailing edges adapted to be in contact with the surface of the workpiece, and sidewalls connecting the leading edge to each of the trailing edges. The sidewalls of the shoes taper: from the leading edge towards the surface of the workpiece so that the sidewalls are present in contact with the protective curtain; and in a plane of the protective curtain so that the relationship is satisfied by alpha >= beta , where alpha is an apex angle between the sidewalls of the shoes and beta is an apex angle between generatrices of the protective curtain at the intersection of the leading edge with the curtain. A tackler of the shoes is placed on the surface of the workpiece. An axis (O'O') of plating of the tackler is parallel to a longitudinal axis (OO) of the head. The shoes are translationally mounted according to an axis that is parallel to the surface of the workpiece, and have an angle of 10-20[deg] . The head is translationally mounted according to an axis that is perpendicular to the surface of the workpiece.