Manufacturing process for coachbuildings and coachbuilding parts for lorries and other vehicles

摘要

In the fabrication of welded joints on body sheets of motor vehicles and suchlike sheet-metal parts by means of laser beams, the problem occurs that the body sheets are partly not dimensionally stable and partly spring back after the sheet has been worked into the desired shape, as result of which gaps partly arise between the sheet-metal parts to be joined. In an apparatus for laser welding with a robot having pressure grips, one advantage of laser welding, namely the high speed, cannot be utilised on account of the retaining and release of the grips. The laser welding of vehicle body parts and suchlike sheet-metal parts in a short time and with little mechanical complexity is possible owing to the fact that at least the sheet-metal part (38) which is not dimensionally stable is fixed in its desired shape by a master bed (38a), is brought into a mutual desired position with the other sheet-metal part (38b) to be welded, the sheet-metal parts (38, 38b) are tacked at discrete points to form a dimensionally stable body part, and then the sheet-metal parts (38, 38b) are firmly and tightly joined to one another by a laser seam weld, in the course of which the sheet (38b) facing the laser head (12) is melted through and the sheet (38) remote from the laser head is at least melted on. IMAGE