Blue Laser Welding of Al-Mg-Fe Die Castings for Hydraulic Sealing
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Solution Overview
Problem
Aluminum die-casting presents challenges in welding with other metals due to the formation of coarse-pored welding structures, leading to inadequate hydraulic sealing and porosity in welding connections.
Innovation Solution
A welding process using a blue diode laser to fluid-densely weld die-cast parts from an Al-Mg-Fe alloy with additional metal parts, specifically utilizing an alloy composition of 4% ≤ Mg ≤ 4.6% and 1.31% ≤ Fe ≤ 1.7% without welding materials, and employing a blue diode laser with a wavelength of 450 nm for enhanced energy absorption and quality welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welding methods are used on die-cast aluminum, then welding can be performed, but coarse-pored weld structure and porosity occur making hydraulic tightness impossible
Solution Approach 1:
The patent applies parameter changes by optimizing the alloy composition parameters (Mg: 4-4.6%, Fe: 1.31-1.7%, Si: max 0.2%) and using a blue diode laser with specific wavelength (450 nm ± 30 nm) to achieve fine-grained weld structures without porosity, resolving the contradiction between weldability and hydraulic tightness
Solution Approach 2:
The patent uses a composite approach by combining specific Al-Mg-Fe alloy composition with blue diode laser technology to create a weld structure that achieves both metallurgical bonding and hydraulic tightness, overcoming the limitations of conventional welding methods
2Use of energy by moving object
If blue diode laser with wavelength 450 nm is used, then energy absorption increases 2.5 times, but equipment cost increases
Solution Approach 1:
The patent changes the laser wavelength parameter from conventional infrared (1064 nm) to blue spectrum (450 nm ± 30 nm), which increases energy absorption by 2.5 times for Al-Mg-Fe alloys, enabling deeper penetration and better weld quality despite higher equipment costs
Solution Approach 2:
The patent replaces conventional infrared laser welding with blue diode laser welding, substituting a more advanced optical system that provides superior energy coupling with the alloy, achieving better welding results through optical parameter optimization
3Ease of manufacture
If alloy composition is optimized for mold-filling properties, then castability improves, but welding performance may be affected
Solution Approach 1:
The patent optimizes alloy composition parameters within specific ranges (Mg: 4-4.6%, Fe: 1.31-1.7%, Si: max 0.2%) to simultaneously achieve excellent mold-filling properties during die-casting and superior weldability with blue diode laser, resolving the contradiction between castability and welding performance
Solution Approach 2:
The patent applies local quality by controlling the distribution and concentration of alloying elements (Mg, Fe, Si) to achieve optimal properties in different aspects: good fluidity for mold filling and controlled microstructure for welding, allowing the same alloy to excel in both casting and welding processes
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 method achieves high-quality, even welding results, reducing costs and weight, and enables hydraulic tightness in applications such as complex pump housings and engine control devices, while ensuring electromagnetic compatibility and fluid-tight connections.
Implementation Method 1
The short wavelengths of the blue laser (approx. 405 nm to approx. 490 nm) promote a higher absorption of energy by the proposed Al-Mg-Fe alloy
Implementation Method 2
a welded connection is produced by a welding method... wherein a blue diode laser and no welding filler material is used for welding
Data Source
Figure 1
AI summary
The invention relates to a welding method, in which a die casting mould part made of an Al-Mg-Fe alloy is welded in a fluid-tight manner to at least one further metal part. For the aluminium alloy, an Mg content of 4% ≤ Mg ≤ 4.6% and an Fe content of 1.31% ≤ Fe ≤ 1.7% are used as well as an admixture content of additional alloy components which comprises a maximum of 0.2% Si. Said Fe content comprises the Al-Mg-Fe eutectic as well as a hypereutectic composition of the two alloy components Fe and Mg. A blue diode laser is used for the welding. No filler metal is used. The invention further relates to a die casting mould part which is welded to at least one further metal part, the welded joint being produced according to a welding method of the type previously described. Furthermore, the invention relates to an actuator housing comprising such a die casting mould part.