Understanding Multi-Laser Process Simulation in AdditiveLabRESEARCH V6 Why Overlap Zones and Their Thermal Histories Matter

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Understanding Multi-Laser Process Simulation in AdditiveLabRESEARCH V6: Why Overlap Zones and Their Thermal Histories Matter

Metal additive manufacturing has rapidly moved toward higher productivity through multi-laser architectures. Modern LPBF systems increasingly rely on two, four, or even more lasers operating in parallel to shorten build times. While this improves throughput, it also introduces new complexity into the thermal behavior of the build—especially in the regions where laser scan fields overlap.

With AdditiveLabRESEARCH V6, these effects can now be explored in high fidelity through dedicated multi-laser thermo-mechanical simulations. The new V6 engine models the exact interaction between simultaneously active lasers, their heat inputs, timing, and spatial relationships, producing a detailed and physically grounded picture of the process.

Investigating Overlap Zones

In multi-laser machines, each laser operates within its own scan field. Where these fields intersect, the thermal history of the material differs significantly from single-laser operation.

AdditiveLabRESEARCH V6 makes it possible to:

• Track the full temperature evolution within overlap regions at sub-millimeter resolution.
• Capture localized reheating and remelting cycles caused by adjacent lasers.
• Quantify peak temperatures, cooling rates, and the temporal spacing between exposures.
• Assess the impact of laser timing strategies, including synchronization, staggered scanning, and variable delays.
• Visualize thermal gradients, melt pool shapes, and heat accumulation in both the individual and combined fields.

This level of insight has not been readily accessible through conventional single-laser process assumptions. V6’s multi-laser solver provides the ability to simulate realistic machine behavior, bridge the gap between scan strategy design and physical outcomes, and predict thermo-mechanical effects with far greater accuracy.

Why This Matters

Laser overlap behavior directly influences several critical aspects of part quality and process stability:

1. Microstructure and Mechanical Properties Repeated reheating in overlap zones modifies cooling rates and thermal gradients, which can affect grain structure, anisotropy, and ultimately mechanical performance. Uniformity cannot be assumed without analyzing these thermal cycles.
2. Residual Stress and Distortion Uneven thermal loading across scan fields is a major source of stress concentrations. Overlap areas often experience higher thermal accumulation, leading to localized distortion patterns that differ from surrounding regions. Accurate prediction is essential for counter-deformation and support design.
3. Defect Formation Hot spots, lack-of-fusion regions, and pore clustering can arise if lasers interact unfavorably. Simulation allows users to test different scan assignments and timing parameters before committing to builds.
4. Process Optimization and Qualification Multi-laser machines require more careful parametrization to maintain consistent quality. Predictive simulation accelerates the tuning of exposure strategies, hatch assignments, and field stitching. This becomes especially valuable in production environments where qualification costs are high.
5. Throughput Without Compromise Higher productivity is only useful if it does not degrade part integrity. Simulation enables engineers to push machine performance while quantifying the limits safely.

AdditiveLabRESEARCH V6 provides a framework where engineers, researchers, and machine OEMs can examine these phenomena directly. Instead of relying on empirical approximations, users can now evaluate multi-laser strategies with physics-based models and make informed decisions about process parameters, scan order, laser coordination, and field boundaries.

As the industry continues moving toward larger build volumes and increasingly complex multi-laser configurations, the ability to understand and control overlap-zone behavior will be a defining factor in achieving both productivity and quality. With V6, this insight becomes accessible, fast, and actionable—turning multi-laser complexity into a competitive advantage.

For more information, reach out to info@additive-lab.com or visit www.additive-lab.com.