How TEYU CWFL-4000ANUP Ensures Stable Green Laser Performance in Metal 3D Printing

In metal additive manufacturing, especially when processing highly reflective materials such as copper and copper alloys, thermal stability is often the deciding factor between a successful build and a failed print.
This case study looks at how a TEYU CWFL-4000ANUP chiller was applied to a 1500W green fiber laser system, helping maintain consistent energy output and improving overall printing quality in demanding production conditions.

Why Green Lasers Are Used for Reflective Metals
Traditional infrared fiber lasers often struggle with highly reflective metals. Materials like pure copper tend to reflect a large portion of the laser energy, leading to unstable melting behavior, inconsistent layer bonding, and lower part density.
Green lasers (around 532 nm wavelength) significantly improve energy absorption on these materials. This makes them increasingly popular in high-precision metal 3D printing applications.
However, this advantage comes with a challenge: green laser systems are highly sensitive to temperature changes. Even small fluctuations can affect beam stability, energy coupling efficiency, and ultimately print consistency.

Application Requirements from the Customer
During the system evaluation phase, the customer’s setup was based on a 1500W green fiber laser with an estimated heat load of approximately 7500W.
To ensure stable operation under continuous printing conditions, the cooling system needed to meet several strict requirements:

Cooling capacity with sufficient safety margin (≥8000W level requirement)
* Temperature stability within ±0.3°C
* Dual independent cooling circuits
* Stable operation under 220V / 50Hz industrial power supply
These requirements reflect a typical high-end metal additive manufacturing environment, where both precision and reliability are critical.

The Chiller Solution: TEYU CWFL-4000ANUP
To meet these demands, TEYU provided the CWFL-4000ANUP, a high-precision industrial chiller designed for fiber laser applications.
The system is engineered to handle the thermal control challenges of high-power green laser processing, particularly in reflective metal 3D printing environments.

1. ±0.3°C High-Precision Temperature Control
The CWFL-4000ANUP chiller maintains temperature fluctuations within ±0.3°C.
This tight control helps reduce thermal drift in the laser source, ensuring stable beam output and consistent energy coupling throughout long printing cycles.

2. Dual Independent Cooling Circuits
The system uses two separate cooling loops to manage the laser source and optical components independently.
This design minimizes thermal interference between key components, improving system stability and reducing the risk of performance degradation during continuous operation.

3. Inverter-Based Energy Efficiency
With variable-speed control technology, the industrial chiller automatically adjusts cooling output based on real-time thermal load.
This not only improves energy efficiency but also helps maintain smoother temperature transitions, which is especially important in long-duration additive manufacturing processes.

4. Industrial Communication via RS-485
The CWFL-4000ANUP supports RS-485 communication with Modbus protocol compatibility.
This enables integration into factory automation systems (MES), allowing users to monitor operating status, manage alarms, and optimize cooling performance remotely.

Performance in Real Printing Conditions
In actual production use, the system demonstrated fast response to fluctuating thermal loads during printing cycles.
The industrial chiller maintained stable water temperature even when the laser operated under variable processing conditions. As a result, the green fiber laser achieved:
* More stable energy coupling on copper and reflective alloys
* Improved melt pool consistency
* Reduced defects such as porosity and incomplete fusion
* Higher repeatability across printed parts
Overall, the thermal control performance directly contributed to better build quality and improved production reliability.

Application Scope
The CWFL-4000ANUP is well-suited for advanced metal additive manufacturing systems, particularly those using green fiber lasers for reflective material processing.

Typical applications include:
* Laser Powder Bed Fusion (L-PBF)
* Laser Directed Energy Deposition (L-DED)
* High-precision copper and alloy 3D printing
* Research and industrial-grade metal AM systems
As metal 3D printing continues to evolve toward higher precision and more challenging materials, stable thermal management becomes increasingly important. A properly designed chiller system plays a key role in ensuring consistent laser performance and final part quality.