Laser Build-Up Welding Beam Profile for Stable High-Speed Deposition
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Solution Overview
Problem
Conventional laser build-up welding methods, including conventional LMD and HS-LMD, are prone to significant fluctuations in welding quality due to small changes in process parameters, such as laser power and beam intensity, leading to inconsistent results and reduced process stability.
Innovation Solution
A laser build-up welding method where a powdered material and laser beam are directed at an angle to the workpiece surface, with the laser beam having a wavelength between 0.4 μm and 1.1 μm and an intensity distribution where the border region is greater than the core region, ensuring consistent heating and widening the process window for more stable welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser build-up welding is used with a standard Gaussian beam profile, then the process is simple to operate, but the welding quality fluctuates significantly with small changes in process parameters
Solution Approach 1:
The patent modifies the laser beam's intensity distribution parameter from a standard Gaussian profile to a customized profile where the border region intensity is greater than the core region intensity. This parameter change makes the welding process less sensitive to variations in laser power and beam intensity, thereby improving welding quality consistency without requiring complex additional equipment
Solution Approach 2:
The patent applies non-uniform intensity distribution across the laser beam cross-section, with specifically enhanced intensity in the border region compared to the core region. This local quality differentiation ensures that powder particles entering at the periphery receive sufficient heating while maintaining overall process stability
2Productivity
If high-speed laser build-up welding is used to increase feed rate, then productivity improves, but the process becomes more sensitive to parameter variations
Solution Approach 1:
The patent implements a customized laser beam intensity profile with enhanced border region intensity, which compensates for the reduced interaction time at high feed rates. This parameter modification allows the process to maintain stability and produce consistent welding results even when operating at high speeds where parameter variations would normally cause significant quality fluctuations
3Productivity
If higher laser power is used to increase feed rate, then productivity improves, but welding quality becomes less consistent
Solution Approach 1:
The patent changes the laser beam intensity distribution profile to have greater intensity in the border region than in the core region. This parameter change allows the use of higher laser powers to achieve higher feed rates while maintaining consistent welding quality, as the enhanced border intensity compensates for the reduced heating time at higher speeds
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 enhances process stability and reliability, reduces surface roughness, and decreases the tendency for cracking, allowing for higher feed rates and the use of higher laser powers while maintaining welding quality, particularly in high-speed LMD processes.
Implementation Method 1
The powdered material is at least partially heated in an interaction zone with the laser beam above the workpiece surface
Implementation Method 2
a melt pool 16 is generated on the surface 12 of a workpiece 10 by means of a laser beam 30... If the melt solidifies, a consolidated layer bonded by melt metallurgy is formed
Data Source
AI summary
A laser build-up welding method includes directing a powdered material and a laser beam onto a workpiece surface of a workpiece at an angle to one another. The powdered material is at least partially heated in an interaction zone with the laser beam above the workpiece surface and is welded onto the workpiece surface along a predefined contour, the laser beam has a wavelength that ranges between 0.4 μm and 1.1 μm. The laser beam within the interaction zone has an intensity in its border region that is greater than an intensity in the core region of the laser beam, so that the powdered material is subjected to the greater intensity of the border region when entering the interaction zone.