Sample interview questions: Can you discuss the concept of laser-induced plasma formation and its impact on laser-assisted machining?
Sample answer:
Laser-Induced Plasma Formation
Laser-induced plasma formation occurs when a high-intensity laser beam interacts with a target material, causing the material to undergo rapid heating, ionization, and expansion. This ionization process creates a plasma, which is a partially ionized gas composed of free electrons and ions. The plasma serves as a highly reactive medium that can enhance the machining process.
Impact on Laser-Assisted Machining
Laser-induced plasma plays a significant role in laser-assisted machining. The plasma’s unique properties offer several advantages:
- Improved Absorption: The plasma has a higher absorption coefficient compared to the solid target, leading to more efficient energy transfer and increased machining depth.
- Ablation Enhancement: The thermal expansion and shockwaves associated with the plasma can promote ablation of the target material, resulting in faster material removal rates.
- Material Modification: The plasma interacts with the target surface, altering its chemical composition and creating unique microstructures or coatings.
- Reduced Heat-Affected Zone: The plasma’s localized nature minimizes the heat-affected zone, preserving… Read full answer