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What about laser welding of the cover for a liquid cold plate?

Laser welding of aluminium, like electron beam welding, has porosity defects. However, cold plate welding requires a 100% seal. In addition, laser welding requires a smaller gap between the two parts.
Friction stir welding is an innovative and popular technology for joining aluminium or copper liquid cold plates. The FSW welded cover ensures a perfect seal of the liquid cold plates. This technique is used for liquid cold plates machined in high-tech sectors such as data centres, aeronautics, etc. It is also used for the manufacture of cast aluminium heat sinks in the field of e-mobility.