Technology Background
As global digital transformation accelerates, the explosive growth of AI workloads, large-scale models, and high-performance computing has pushed chip power consumption into the tens-of-kilowatts range. Rack-level power density is rising exponentially, driving unprecedented demands on thermal management. Traditional air-cooling solutions are rapidly approaching their physical and efficiency limits, struggling to meet requirements for heat dissipation, reliability, and energy efficiency.
Liquid cooling, with its significantly higher specific heat capacity, enables faster heat transfer, higher thermal efficiency, and improved energy utilization. It has emerged as the most viable—and in many cases the only—solution for next-generation data centers. Liquid-cooled facilities can reduce PUE to below 1.2, delivering substantial energy savings and aligning with global low-carbon initiatives. Industries such as telecommunications, internet services, and financial computing are rapidly expanding their adoption of liquid cooling.
Under the combined momentum of carbon neutrality goals and high-density computing demand, liquid cooling has evolved from an optional enhancement into a mission-critical infrastructure technology. Industry forecasts suggest that 2026 may mark a breakout year for liquid-cooled server components, ushering in large-scale capacity expansion and full-scenario deployment.
Limitations of Traditional Manufacturing Technologies
Conventional liquid-cooling component manufacturing relies on TIG welding, brazing, and friction stir welding. While mature, these methods fall short when faced with the new generation of cooling components that demand:
- Higher dimensional precision
- Superior weld strength and sealing reliability
- Compatibility with complex internal geometries
- Consistent quality in high-volume production
Laser welding, enabled by high energy density, minimal heat input, and exceptional controllability, has emerged as the dominant joining technology for liquid-cooling components. Modern laser welding machines deliver performance that traditional processes simply cannot match.
Why Laser Welding Is Ideal for Liquid-Cooled Server Components
Laser welding is a high-efficiency, high-precision joining technology that aligns perfectly with the needs of advanced thermal management systems. Whether deployed as a standalone laser welder or as part of an automated production line, its advantages are clear.
1.Ultra-High Welding Precision
Laser welding enables micron-level control, which is critical for microchannels, thin-wall structures, and compact assemblies in liquid-cooled servers. Precise welds minimize leakage risks and ensure consistent thermal performance.
2.High-Speed Production
With rapid welding speeds, laser welding machines significantly shorten cycle times. This is essential for liquid-cooled server components, which typically involve numerous weld seams and demand scalable, high-throughput manufacturing.
3.Superior Weld Quality
Laser welds are narrow, deep, and uniform, with minimal heat-affected zones and low distortion. This preserves structural integrity, improves aesthetics, and enhances long-term reliability under continuous high-load operation.
4.Non-Contact Processing
As a non-contact process, laser welding introduces no mechanical stress to sensitive components. This is particularly valuable for precision cooling assemblies where deformation could compromise sealing or alignment.
5.Strong Material Adaptability
Laser welding is suitable for a wide range of materials and thicknesses, including copper, aluminum, stainless steel, and dissimilar metal combinations. Parameter flexibility allows manufacturers to optimize welds for diverse design requirements.
6.Automation and Intelligence Ready
Laser welding machines integrate seamlessly with automation systems, enabling intelligent control, in-process monitoring, and consistent quality—key factors for mass production of data center hardware.
Cold Plate Liquid Cooling: The Dominant Market Solution
Mainstream liquid cooling approaches include cold plate cooling, immersion cooling, and spray cooling. Among them, cold plate liquid cooling has become the preferred solution, accounting for over 60% of the market.
Cold plate systems remove approximately 70–75% of rack heat by circulating coolant directly through plates mounted on CPUs and GPUs. While not fully liquid-cooled, they offer outstanding compatibility with existing server architectures, lower retrofit complexity, and higher operational reliability since liquid does not directly contact electronic components.
Laser welding plays an irreplaceable role in manufacturing cold plates, quick connectors, manifolds, and CDUs (Cooling Distribution Units), ensuring high-strength joints, leak-free sealing, and long-term stability under extreme thermal loads.
How Cold Plate Liquid Cooling Works
Cold plate liquid cooling systems consist of a primary loop and a secondary loop, separated by the CDU.
1.Indirect Heat Absorption
Heat-generating components such as CPUs and GPUs are mounted onto copper or aluminum cold plates. Coolant flowing through the cold plate absorbs heat directly from the source.
2.Dual-Loop Circulation
- Primary loop: connects the CDU to external cooling towers for heat rejection.
- Secondary loop: circulates coolant between servers and the CDU to collect heat.
3.Heat Exchange and Dissipation
Heat is transferred from the secondary loop to the primary loop and ultimately released to the environment through cooling towers.
Laser Welding Applications in Cold Plate Liquid Cooling Systems
Han’s Laser provides complete laser welding solutions for liquid cooling components, covering process development, laser welding machines, and automated system integration.
Oscillating welding head welding trajectory
Advanced configurations include high-speed wobble welding heads capable of circular, Z-shaped, and figure-eight trajectories. This expands the effective spot size, improves gap tolerance, and accommodates complex internal piping. Integrated in-process monitoring enables defect prevention, real-time quality control, and full data traceability.
Key Application Scenarios
Cold Plate Manifold Laser Welding
Manifold welding connects main coolant pipelines to branch channels. This process demands exceptional concentricity and sealing performance.
Case Example
- Material: 1.1 mm stainless steel pipe + 1.1 mm stainless steel pipe
- Requirement: Leak-free, high-strength joint
- Challenge: High concentricity accuracy
A dedicated laser welding machine combined with a precision rotary fixture ensures uniform welds free of cracks and porosity.
Cold Plate Cover-to-Base Laser Welding
Cold plates are the core heat exchange components. Laser welding ensures hermetic sealing between cover and base while minimizing copper’s reflectivity and thermal diffusion effects.
Case Example
- Material: 1.5 mm copper cover + 2.0 mm copper base
- Requirement: Oxidation-free, consistent penetration, high-strength sealing
- Challenge: Copper’s high reflectivity and thermal conductivity
Bellows Laser Welding
Bellows are complex, thin-walled components requiring exceptional dimensional stability and airtightness.
Case Example
- Material: 0.8 mm stainless steel pipe + 0.8 mm stainless steel pipe
- Requirement: No deformation, no oxidation, perfect sealing
- Challenge: Complex geometry and high oxidation sensitivity
High-energy-density laser welding machines deliver precise, low-distortion welds ideal for these demanding structures.
Conclusion
As AI-driven computing continues to push power density and energy efficiency to new extremes, thermal management has become a decisive factor in system performance. By advancing laser welding processes for liquid cooling components, Han’s Laser is helping build the “cooling engine” behind the digital economy.
Through precise, reliable, and scalable laser welding solutions, liquid cooling can fully integrate with high-performance computing and ultra-low PUE targets—accelerating the formation of a smart, green, and mature liquid cooling industry ecosystem.
To learn more about how laser welding solutions can support high-reliability manufacturing for AI liquid-cooled servers and advanced thermal management components, contact Han’s Laser. Our engineering team provides proven laser welding systems tailored for precision, consistency, and scalable production.