1.9 μm Laser Fusion Welding with Adaptive Spot Power Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current laser welding or cutting technologies face challenges in obtaining high-power light sources and controlling light spot power density, limiting their application.
Innovation Solution
A fusion welding device utilizing a 1.9 μm laser with a control unit and light spot adjusting device, featuring a high-power laser light source and optical lenses, allows for precise control of laser power density and light spot size through time, power, and spot adjustments, using side pumping and in-band pumping techniques to achieve high-efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing laser welding or cutting technology is used, then basic welding or cutting function is provided, but high-power light source acquisition and light spot power density control are limited
Solution Approach 1:
The patent implements dynamic control of the light spot adjusting device, allowing real-time modification of optical lens positions and light spot parameters during laser welding or cutting operations. This enables adaptive adjustment of power density while maintaining high output power, resolving the contradiction between power level and control reliability.
Solution Approach 2:
The system changes multiple parameters simultaneously including light spot size, focal depth, and optical lens positioning to achieve precise power density control. By modifying these parameters dynamically, the patent overcomes the limitations of existing technology in controlling light spot power density while maintaining high laser power output.
2Manufacturing precision
If light spot size is reduced for high precision welding, then manufacturing precision is improved, but laser power density control becomes more difficult
Solution Approach 1:
The light spot adjusting device serves multiple functions: it controls light spot size, adjusts focal depth, and modifies power density distribution. This multi-functionality allows the system to achieve high precision welding while managing power density control through a single integrated device rather than multiple separate systems.
Solution Approach 2:
The patent introduces a light spot adjusting device as an intermediary between the laser source and the workpiece. This intermediary component enables precise control of light spot parameters and power density without requiring direct modification of the laser source itself, thereby achieving high precision while managing system complexity.
3Productivity
If high-power laser is used for efficient welding, then productivity is improved, but thermal effects and stability issues arise
Solution Approach 1:
The patent employs periodic or pulsed laser action through the control unit, which modulates the laser output in controlled cycles. This periodic action allows high-power delivery for efficient welding while providing intervals that reduce cumulative thermal effects, thereby maintaining productivity while mitigating harmful thermal accumulation.
Solution Approach 2:
The system maintains continuous useful action through optimized laser parameter control and light spot adjustment, ensuring efficient welding progress while managing thermal effects. The continuous adjustment of light spot size and position allows sustained high productivity without excessive thermal accumulation that would compromise stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-precision cutting or welding by controlling the size and focal depth of the light spot, overcoming thermal effects and achieving high-power, stable 1.9 μm laser output, suitable for various materials with strong absorption performance.
Implementation Method 1
a 1.9 μm laser light source has output power of 100-500 W
Implementation Method 2
using side pumping and in-band pumping techniques to achieve high-efficiency and stability
Implementation Method 3
using side pumping and in-band pumping techniques to achieve high-efficiency and stability
Implementation Method 4
the light spot control unit is configured to control a distance between the plurality of optical lenses through the electric slideway to adjust the size of the light spot
Implementation Method 5
suitable for various materials with strong absorption performance
Data Source
AI summary
A laser fusion welding device includes a 1.9 μm laser light source, a control unit and a light spot adjusting device. The control unit is configured to control the laser light source and the light spot adjusting device to adjust a laser power density at an object to be subjected to fusion welding. The 1.9 μm laser light source has output power of 100-500 W. The control unit includes a time control unit, a power control unit and a light spot control unit. The time control unit is configured to control a turn-on time of the laser light source. The power control unit is configured to control the output power of the laser light source. The light spot control unit is configured to control the light spot adjusting device to adjust a size of a light spot at the object to be subjected to fusion welding.