Industrial laser welding requires rapid parameter optimization, but existing CFD models remain too computationally expensive for practical use. This work addresses this challenge through a calibrated multi-regime thermal source model that enables fast prediction of weld geometry while maintaining engineering accuracy. The model uniquely combines conduction and keyhole welding regimes within a single analytical framework, accounting for beam wobbling and plasma effects. Validated through bead-on-plate experiments on IN625 across industrial-relevant parameters, the approach reduces computational effort significantly compared to fluid dynamics simulations, making it suitable for industrial parameter screening and optimization. © The Author(s) 2026.

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