Method for welding a bent rod conductor containing metal with strength redistribution in the initial and end phase

Abstract

The present invention relates to a method for welding bent rod-shaped conductors (1a, 1b) containing metal, wherein at least two rod-shaped conductors (1a, 1b) are arranged to partially overlap and welded to each other by means of a processing laser beam (9), wherein weld beads (11) are formed to connect the rod-shaped conductors (1a, 1b) to each other, wherein the processing laser beam (9) at the workpiece surface (7) traverses a welding profile (10) relative to the rod-shaped conductors (1a, 1b), wherein the traversal of the welding profile (10) of the at least two rod-shaped conductors (1a, 1b) includes an initial phase (AP), a main phase (HP), and an end phase (EP), wherein the total power P of the processing laser beam (9) is used to weld the rod-shaped conductors (1a, 1b). ges The intensity (I0) of the processing laser beam (9) is at least substantially sustained in time during the initial phase (AP), main phase (HP), and final phase (EP), wherein, during the initial phase (AP), at least in a portion of the beam cross-section (20) of the processing laser beam (9) at the workpiece surface (7), the spatially averaged intensity (I0) of the processing laser beam (9) about that portion of the workpiece surface (7) is... teil As time increases, in the main phase (HP), at least in a portion of the beam cross section (20) of the processing laser beam (9) at the workpiece surface (7), the spatially averaged intensity (I) of the processing laser beam (9) reached at the end of the initial phase (AP) with respect to that portion of the region. teil The intensity (I) of the processing laser beam (9) remains at least substantially constant over time, wherein, in the final stage (EP), at least in a portion of the beam cross section (20) of the processing laser beam (9) at the workpiece surface (7), the intensity of the processing laser beam (9) is spatially averaged with respect to that portion of the region. teil The intensity decreases over time, starting from the end of the main phase (HP). This invention provides a method for laser welding metallic rod-shaped conductors that achieves short process times while simultaneously producing high-reliability, high-quality welds.