2.2 Application Areas of Laser Technology in Bridge Construction

Laser technology enhances various aspects of bridge construction by embodying precision, efficiency, and quality. The key application areas include:

2.1 Application of Fiber Laser Cutting

Fiber laser cutting utilizes a high-power density laser beam to irradiate and rapidly heat the material to its vaporization temperature, forming precise holes. As the laser beam moves, it creates a narrow slit (approximately 0.1mm) to complete the material cutting process.

Benefits in Bridge Construction:

• Material Versatility: Capable of cutting various metals such as carbon steel, stainless steel, aluminum alloy, and copper.
• High-Quality Cuts: Produces vertical cut surfaces with no burrs, thin oxide layers, smooth finishes, minimal thermal deformation, and high accuracy for complex curves.
• Efficiency: Accelerates the construction process while ensuring the quality of materials used in bridge span structures and support systems.

2.2 Application of Fiber Laser Welding

Laser welding employs high-energy laser pulses to locally heat and melt materials, forming a precise molten pool that achieves the welding process. It is widely used in industries such as manufacturing, automotive, electronics, and biomedicine.

Advantages in Bridge Construction:

• High Depth-to-Width Ratio: Suitable for welding thick steel plates (up to 10mm or more) with tight, slag-free, and smooth welds.
• Enhanced Toughness: Laser brazing joints use liquid brazing material to ensure strong connections between parts.
• Minimal Heat Affected Zone: Reduces the need for preheating and prevents annealing of welded workpieces.
• Precision and Automation: Facilitates precise welding of small and intricate areas, enabling easy automation and high positioning accuracy.

2.3 Application of Laser Cleaning

Laser cleaning involves a photophysical reaction where high-intensity, short-pulse lasers interact with contamination layers to achieve effective cleaning without physical contact.

Benefits in Bridge Maintenance:

• Environmentally Friendly: Eliminates the need for chemical cleaning agents, reducing environmental pollution.
• Non-Contact Process: Prevents grinding, avoids heat effects, and is suitable for various materials.
• Effective Rust and Surface Removal: Prepares surfaces for repairs by efficiently removing rust and degraded layers, which traditional methods may fail to address.

3. Future Prospects of Laser Technology in Bridge Construction

Despite China’s leading position in high-speed rail technology, many remote mountainous areas remain inaccessible, necessitating the construction of numerous roads and bridges to connect these regions. Laser technology applied in bridge construction is poised for a bright future, becoming a significant growth area within the laser equipment application industry. Its continued advancement will support the development of infrastructure, ensuring connectivity and economic growth in previously isolated areas