The substrate/water channel and a ‘lid’ are CNC machined. The two pieces are then friction stir welded together. This process allows for the low cost production of liquid cold plates with wider flexibility of coolant flow path design as well as allowing added surface area within the liquid flow through use of fins machined into one of the parts.
Post weld CNC machining is then completed and the liquid cold plate leak tested.
One limitation of this process is that the welds cannot be too close together thereby slightly limiting the flexibility of design of the cold plate. Where that causes an issue vacuum brazing may be the best alternative cold plate technology.
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