Annular Laser Welding Parameters for Aluminum Pore Suppression
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Solution Overview
Problem
High-power laser welding of high-thermal conductivity metals like aluminum alloys is plagued by prominent porosity defects due to keyhole collapses, and conventional Gaussian beams have limitations in energy distribution, leading to unstable processes and a lack of systematic pore improvement solutions.
Innovation Solution
Optimizing process parameters for adjustable annular laser welding by establishing relationships and constraints between beam diameter, center point linear energy, and welding parameters, including laser power, speed, and power ratio, to control energy distribution and inhibit pore formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional Gaussian beam is used for laser welding, then energy is concentrated in the center region, but this leads to large thermal gradient and unstable welding process with frequent keyhole collapses
Solution Approach 1:
The patent applies local quality by creating different energy distribution zones within the laser beam - the upper annular region provides high energy density for keyhole formation while the lower Gaussian region provides gentle energy input for pool stability. This spatial differentiation of energy quality resolves the contradiction between energy concentration and process stability.
Solution Approach 2:
The laser beam is segmented into two distinct functional regions: an upper annular beam component and a lower Gaussian beam component. This segmentation allows each region to perform its specialized function - the annular region drives keyhole penetration while the Gaussian region stabilizes the molten pool, thereby improving overall welding reliability.
2Productivity
If high-power laser is used for deep penetration welding, then welding efficiency is improved, but pore defects caused by keyhole collapse become more prominent
Solution Approach 1:
The lower Gaussian beam component acts as an intermediary that stabilizes the keyhole wall and molten pool, preventing the harmful effect of keyhole collapse. While the upper annular beam provides the high energy density needed for deep penetration, the Gaussian component mediates the energy transfer to maintain keyhole stability and prevent pore formation.
Solution Approach 2:
The patent changes the energy distribution parameters by using an asymmetric dual-component beam profile instead of a conventional symmetric Gaussian beam. By adjusting the relative proportions and spatial distribution of the annular and Gaussian components, the system achieves both deep penetration and keyhole stability, eliminating pores while maintaining high welding efficiency.
3Reliability
If adjustable annular laser is used to improve welding stability, then process stability is improved, but there is a lack of systematic pore improvement solution due to weak research foundation
Solution Approach 1:
The patent establishes feedback relationships between the annular beam parameters (diameter, power ratio) and welding outcomes (penetration depth, pore formation). By defining quantitative relationships and constraint conditions, the system provides a feedback mechanism that guides parameter selection to achieve both stability and pore-free welds, reducing the complexity of parameter optimization.
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
The method and system significantly reduce pore defects, ensuring high-quality welding with large penetration, improve welding efficiency, and provide a systematic solution applicable to various aluminum alloy components.
Implementation Method 1
High-power laser welding technology has characteristics of high energy density, small heat input
Implementation Method 2
The core idea of adjustable annular laser welding technology is to introduce an annular laser beam based on high-power (Gaussian spot) laser welding to regulate the spatial distribution of laser energy
Implementation Method 3
Most of these pores are caused by the keyhole collapse during the laser deep penetration welding process
Data Source
AI summary
The disclosure belongs to the technical field of high-power laser welding, and discloses a method and system for optimizing process parameters to suppress pores in high-power laser shaping welding. The method includes: obtaining the relationship between the adjustable annular laser beam diameter, the linear energy at the center point, with welding process parameters; and establishing optimization constraint conditions for them; obtaining the preset range of process parameters and substituting parameter values within this range into the optimization constraint conditions; the process parameter combinations that meet both optimization constraint conditions are the optimized process parameters. This disclosure, by flexibly adjusting the power ratio of the central Gaussian beam and the outer annular beam, significantly improves the pore problem in laser welding of aluminum alloys while ensuring large penetration depth, providing reference for high-quality welding of aluminum alloys.