Liquid Cold Plates are used in industrial thermal management, power electronics, energy storage, and high-performance computing systems. Three common manufacturing methods are embedded tube construction, friction stir welding (FSW), and brazing. Each offers different advantages in channel geometry, manufacturability, and cost.
What Is a Tube Liquid Cold Plate?
A tube Liquid Cold Plate uses metal tubing embedded within a machined aluminum or copper base. Coolant flows through the tubing, absorbs heat conducted from the base, and transfers it to an external cooling system. A typical process includes CNC groove machining, tube bending, embedding, fixing, and inspection.
Advantages of Tube Liquid Cold Plates
Flexible tube routing
Customizable plate dimensions
Practical construction for many industrial applications
Suitability for distributed heat sources
Adaptable mounting and connection configurations
Tube-to-base thermal contact must be carefully controlled.
What Is an FSW Liquid Cold Plate?
An FSW liquid cold plate typically uses CNC-machined channels sealed by a metal cover through friction stir welding. FSW is a solid-state joining process that creates a metallurgical bond without melting the base metal. This approach is useful for aluminum cold plates requiring customized internal passages.
Advantages of FSW Liquid Cold Plates
Customized internal channel geometry
Integrated metal construction
Suitability for many large-area cooling applications
Adaptable mechanical and mounting designs
Weld accessibility, channel layout, sealing integrity, and manufacturability are important constraints.
What Is a Brazed Liquid Cold Plate?
Brazed liquid cold plates join metal components with a suitable filler material to form sealed internal passages. Brazing can support internal fins, multilayer passages, and enhanced heat-transfer structures, but requires careful joint design, thermal processing, and inspection.
Advantages of Brazed Liquid Cold Plates
Complex internal flow structures
Compact cooling assemblies
Potential integration of internal heat-transfer enhancements
Suitability for selected high-density thermal applications
Tube vs. FSW vs. Brazed Cold Plates: Key Differences
| Feature | Tube Cold Plate | FSW Cold Plate | Brazed Cold Plate |
|---|---|---|---|
| Cooling structure | Embedded metal tubing | Machined and welded channels | Brazed internal passages |
| Channel flexibility | Custom tube routing | Custom machined geometry | Complex internal structures |
| Common materials | Aluminum base, copper tubing | Often aluminum alloys | Aluminum or copper assemblies |
| Manufacturing complexity | Depends on tube layout | Depends on machining and welding | Depends on joint and passage complexity |
| Typical applications | Industrial electronics, power modules | Power electronics, EV and ESS | Compact, high-density electronics |
These are general comparisons. Actual performance depends on the specific design.
Which Cold Plate Offers Better Thermal Performance?
No manufacturing method guarantees the lowest temperature in every application. Performance depends on heat load, heat flux, coolant flow, inlet temperature, channel geometry, base material, interface resistance, and available pumping pressure.
For example, a brazed cold plate with enhanced internal fins may suit concentrated heat sources, while an embedded tube cold plate may be sufficient for an industrial assembly with distributed heat sources.
Which Manufacturing Method Is More Cost-Effective?
Cost depends on size, materials, channel complexity, machining, joining processes, and production volume. Comparisons should use actual engineering drawings and quantities rather than generic assumptions.
How Should Engineers Select the Right Technology?
Define maximum heat load and heat-source distribution.
Establish allowable component temperature.
Specify coolant type, flow rate, and maximum pressure drop.
Confirm mechanical dimensions and operating pressure.
Estimate prototype and production quantities.
Select the manufacturing process against the complete requirements.
Tube, FSW, and brazed liquid cold plates all offer useful solutions. Tube designs can be attractive when flexible routing and distributed cooling are priorities. KINGKA provides custom tube liquid cold plates with configurable base materials, copper tube routing, CNC-machined features, and coolant connections.
