Method for producing large metal sheets by laser welding in association with pressure rollers and worktable with means for moving closer two worktable parts

摘要

A precision production method is used for producing large metal sheets by welding together smaller sheet blanks (2a,2b). A worktable (1) is used for supporting and holding the sheet blanks (2a,2b). During the time of the production process, two sheet blanks (2a,2b) are immovably attached to the worktable (1) in a position with two border areas close to one another. Each sheet blank (2a,2b) is attached to its own part (1a,1b) of the worktable, between which parts (1a,1b) there is a gap (3) at the position of said border areas. Thereafter, in case said border areas do not fit together with sufficient accuracy, a cutting of the border areas of both sheet blanks (2a,2b) is performed at the position of said gap (3), either as a joint cut through two overlapping border areas or as separate cuts through each of said border areas. Thereafter said sheet blank borders are placed against one another to form a close fit. If this requires movement of the sheet blanks (2a,2b), the movement is obtained by moving said parts (1a,1b) of the worktable closer to one another. Finally, joining said sheet blank borders to one another by welding is performed by using, in the immediate vicinity of the welding area, pressure rolls or the like sheet blank loading units pressing said sheet blanks (2a,2b) firmly against the worktable (1).