Modeling of Bead-on-Plate Laser Beam Melting Using Innovative Laser with a Single-Mode Core Surrounded by a Multimode...

Area of Science:

• Materials Science
• Mechanical Engineering
• Laser Physics

Background:

• Single laser beams have limitations in heat treatment and welding.
• Hybrid dual-beam laser systems offer improved performance.
• A novel approach combines a single-mode core beam with a multimode ring beam.

Purpose of the Study:

• To develop a mathematical and numerical model for the power density distribution of a combined dual-beam laser source.
• To simulate transient thermal phenomena in laser material processing.
• To validate the model against experimental results for structural steel.

Main Methods:

• Developed a cylindrical-power-involution model to describe power distribution.
• Applied the model to simulate bead-on-plate laser melting of S355 steel.
• Used a computational domain representing surface melting with heat conduction.

Main Results:

• The model successfully simulated transient thermal phenomena.
• Predicted fusion zones and heat-affected zones showed good agreement with experimental data.
• The dual-beam model proved suitable for bead-on-plate laser processing.

Conclusions:

• The proposed cylindrical-power-involution model accurately represents dual-beam laser power density.
• The model is effective for simulating laser melting processes in structural steel.
• This work validates a new approach for optimizing dual-beam laser applications.