When welding (super)alloys, the energy input of the laser beam is of central importance.
The parameters of the laser beam in CW mode – or optionally in pulsed mode – must be precisely tuned:
- Slightly excessive laser energy negatively alters or destroys the lattice structure of the alloy.
- Too little laser energy creates a false bond due to insufficient melting.
The balance is extremely important here.
In addition, the work must be 100% clean. In the worst case, foreign particles in the melt can lead to component failure with these sensitive alloys.
It is also particularly important that the welding consumables are carefully matched to the base material. This is done in elaborate laboratory work and is indispensable for a durable joint. The properties of the base material must be achieved in all respects.