| Abstract: | Laser Beam Short Pulse Welding of Metal Foils Joining of metallic foils by laser beam spot welding is applied in different fields of electronic production and micro joining technology. The main challenges hereby are the realization of weld spots with high quality, i. e. weld spots with high stability and smooth shape, as well as the stabilization of the process. By the application of short laser pulses usually used for drilling or cutting the time at which the melt pool exists can be reduced and therefore the probability of arising instabilities, too. Short laser pulses are pulses with a length lower than one millisecond; pulses with a pulse length lower than one nanosecond are called ultra short pulses. The attempt of welding metallic foils by short laser pulses provides also the advantage of a lower thermal influence of the material. And a more simple system technology is possible then because different manufacturing methods can be realized with one laser. The main intention of the shown results of some investigations is the qualification of the welding process. Hereby the reachable weld spot quality as well as the enlargement of the process window is of special importance. |
