: Thieme, S.; Nowotny, S.; Scharek, S.; Brückner, F.

Abstract
The laser welding system, whose laser beam (3) having a reflective and/or beam-forming optical elements is directed to a filler material (5) on a processing area of a workpiece over an inlet, comprises an alternator connected to an inductor (2) arranged at the inlet for preheating the filler material. The laser beam is directed to a surface of the workpiece at an angle of less than 90[deg] . The inductor is designed as a cooled coil and is fed through the inlet to the filler material. An element made from dielectric material is arranged between the inductor and filler material. The laser welding system, whose laser beam (3) having a reflective and/or beam-forming optical elements is directed to a filler material (5) on a processing area of a workpiece over an inlet, comprises an alternator connected to an inductor (2) arranged at the inlet for preheating the filler material. The laser beam is directed to a surface of the workpiece at an angle of less than 90[deg] . The inductoris designed as a cooled coil and is fed through the inlet to the filler material. An element made from dielectric material is arranged between the inductor and filler material or the inlet is formed or present in a gap at an inlet region of the inductor made from dielectric material. The inlet or a part of the inlet is formed at the inlet region of the inductor made from an inductively heatable material and an element made from a material with higher thermal conductivity is arranged as an element made from an inductively heatable material between the inductor and the filler material supplied to the inlet. The filler material is supplied vertically on the surface of the workpiece. A module (4) is formed with the inductor and the inlet and the module and/or the inductor is/are interchangeable. A magnetic field concentrator (6) is arranged at the inductor. A protective gas supply external to the inlet, is directed to the processing region through which inert gas is supplied separatelyfrom the filler material. The inlet is made completely from the dielectric material. The frequency and/or the efficiency of the alternator are modifiable. An additional inductor for heating and/or maintaining higher temperature is arranged before, after, adjacent or around the processing region and at a distance from the surface of the workpiece.