Laser Welding Spiral Path Stabilizes Keyhole
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Solution Overview
Problem
Existing laser welding methods face challenges in achieving consistent weld strength and surface smoothness due to factors like outgassing, heat input, beam velocity, and weld penetration, particularly in welding different materials such as steel and aluminum alloys.
Innovation Solution
The method involves controlling the movement of a laser beam along a weld path with a first order of continuity, such as an Archimedean spiral, and adjusting parameters like power, defocusing, and velocity to maintain a stable keyhole and consistent gas outgassing, ensuring deep penetration and smooth surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser welding paths are used, then welding speed can be maintained, but weld surface smoothness and consistency deteriorate due to unstable keyhole and outgassing
Solution Approach 1:
The patent applies a spiral weld path geometry (circular/curved path) instead of linear paths. The spiral path creates continuous circular motion of the laser beam, which stabilizes the keyhole formation and gas outgassing process, resulting in smoother weld surfaces while maintaining welding speed
Solution Approach 2:
The patent implements dynamic control of laser parameters (power, focal position, beam diameter) that continuously adapt during the welding process. The controller adjusts these parameters in real-time based on the spiral path progression, maintaining optimal keyhole stability and surface quality throughout the weld
2Strength
If laser parameters are adjusted to improve weld penetration, then weld strength improves, but outgassing instability and surface quality deteriorate
Solution Approach 1:
The patent employs a controller that monitors and adjusts laser parameters in real-time during welding. This feedback mechanism maintains stable keyhole conditions by continuously optimizing power, focal position, and beam diameter, ensuring consistent gas outgassing and preventing porosity while achieving deep penetration and strong welds
Solution Approach 2:
The patent systematically varies laser parameters (power level, focal position, beam diameter) during the welding process. By dynamically changing these parameters along the spiral path, the process achieves optimal penetration depth while maintaining stable keyhole formation and controlled outgassing, eliminating the trade-off between strength and surface quality
3Productivity
If welding speed is increased to improve productivity, then processing time decreases, but weld penetration and surface quality deteriorate
Solution Approach 1:
The patent uses dynamic parameter adjustment where laser power, focal position, and beam diameter are continuously modified during welding. This dynamic control allows the system to maintain consistent penetration depth and surface quality even at high welding speeds along the spiral path
Solution Approach 2:
The spiral weld path provides continuous laser exposure along the entire weld seam without interruption or repositioning. The continuous circular motion ensures uniform heat distribution and consistent keyhole formation throughout the weld, maintaining high productivity with uniform penetration and surface quality
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
This approach results in strong, pore-free welds with reduced spatter and zinc-induced porosity, achieving efficient welding of various materials with improved surface quality and reduced processing time compared to conventional methods.
Implementation Method 1
A method of laser welding includes moving at least one of a laser beam and the components
Implementation Method 2
controlling at least one of a defocusing distance of the laser beam, a velocity of the laser beam, or a power level of the laser beam
Data Source
AI summary
A method of laser welding a first component to a second component includes moving at least one of a laser beam and the components via a controller along a weld path at least a portion of which is a spiral having a first order of continuity thereby welding the first component to the second component. In one embodiment, the spiral is an Archimedean spiral.