Weld assembly with weld-aid coating and preparation method for the weld assembly

A preparation method for a weld assembly, characterized by comprising:

• applying a weld-aid coating to:
• a first welding layer, based on the first welding layer having a higher multiphoton absorption threshold than a second welding layer;
• the second welding layer, based on the second welding layer having a higher multiphoton absorption threshold than the first welding layer;
• or
• either the first welding layer or the second welding layer based on the first and second welding layers having equal multiphoton absorption thresholds;
• wherein the first welding layer is transparent to laser radiation;
• laminating the second welding layer and the first welding layer,
• wherein the weld-aid coating is located at an interface between the first welding layer and the second welding layer;
• pressing the second welding layer against the first welding layer to form an assembly to be welded;
• and
• welding the assembly to be welded by ultrashort pulse laser welding to fix the weld-aid coating to the first welding layer and the second welding layer.