**2. Experimental Setup**

#### *2.1. Laser Beam Welding Setup*

For the welding tests, a diode-pumped solid state disk laser system (TruDisk 16002, Trumpf, Ditzingen, Germany) was used with specifications according to Table 2.


The laser head is held in one single position by a robot system (Kuka, Augsburg, Germany) and the welding speed is provided by rotating the specimen for the ultrasonic assisted laser beam welding process, see Figure 2. The complete setup is described in detail in [11]. Only adapters and specimens have been changed.

**Figure 2.** Experimental setup for ultrasonic assisted laser beam welding.
