Abstract: A method for welding together two layers or workpieces within a multi-layer assembly in which laser light is directed through an outer layer of the assembly, allowing transmission of the laser light from its outer surface to at least within the vicinity of its inner surface substantially without any absorption of energy from the laser light. The laser light is directed towards a layer having an absorbent component, corresponding to a portion thereof, capable of absorbing laser light within a given wavelength range thereby creating a welded area between a surface of the layer having the absorbent component and a surface of a layer facing the layer having the absorbent component. The absorbent component can be provided either within the bulk of a layer or it can be provided as a separate surface layer on one or both surfaces of a layer.

Abstract: A method welds together two layers within a multi-layer assembly Laser light is directed through an outer layer of the assembly that allows transmission of the laser light from its outer surface to at least within the vicinity of its inner surface substantially without any absorption of energy from the laser light, towards a layer including an absorbent component, corresponding to a portion thereof. The absorbent component is capable of absorbing laser light within a given wavelength range thereby creating a welded area between a surface of the layer having the absorbent component and the surface of a layer facing the layer having the absorbent component while other layers remain unwelded.