Hydraulic Component Joining Using Friction-Welded AM Sections
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Solution Overview
Problem
Conventional welding methods for hydraulic components are limited by requiring same or similar materials and are costly, time-consuming, and prone to distortion, especially when joining complex and large-volume components, restricting material combinations and increasing safety and post-processing requirements.
Innovation Solution
A hydraulic component comprising an additively manufactured portion with complex geometries for low pressure loss and high strength/weight ratio, joined to a second portion via friction welding, allowing for different material combinations and reducing manufacturing costs by using friction welding's stability and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional welding methods are used to join hydraulic components, then strong bonds between portions can be achieved, but the material combinations are limited to same or similar materials and the manufacturing cost and time increase significantly
Solution Approach 1:
The patent changes the joining method from conventional welding to friction welding, which fundamentally alters the physical and chemical parameters of the joining process. Friction welding operates at lower temperatures without melting the base materials, eliminating the need for filler metals and complex pre/post-treatment processes. This parameter change enables joining of dissimilar materials (e.g., aluminum to steel, titanium to copper) that are incompatible with conventional welding, while simultaneously reducing manufacturing cost and complexity.
Solution Approach 2:
The patent replaces the thermal-chemical process of conventional welding with a mechanical process of friction welding. Instead of using heat and filler materials to create a bond, the invention uses mechanical friction and pressure to generate heat locally at the interface and forge a metallurgical bond. This substitution eliminates the need for complex welding equipment, safety measures for sparks and fumes, and post-welding treatments, thereby reducing manufacturing cost and enabling broader material combinations.
2Shape
If additive manufacture is used for large-volume or elongate components, then complex geometries can be achieved, but the manufacturing process becomes expensive and time-consuming with susceptibility to distortion
Solution Approach 1:
The patent divides the hydraulic component into multiple portions, with only the portions requiring complex geometries (such as flow channels, cooling passages, or integrated features) being manufactured additively. The remaining portions with simple geometries are manufactured using conventional, faster, and more cost-effective methods. This segmentation allows the project to benefit from additive manufacturing's geometric freedom only where necessary, while maintaining high productivity and low cost for the overall component.
Solution Approach 2:
The patent applies different manufacturing methods to different portions of the component based on their specific geometric requirements. Additive manufacturing is used locally only for portions requiring complex internal or external geometries, while conventional manufacturing is used for portions with simple shapes. This localized application of manufacturing techniques optimizes the balance between geometric complexity and manufacturing efficiency.
3Strength
If conventional welding is used for joining portions, then material-bonded connection can be achieved, but sparks, smoke, and weld spatters are generated requiring safety measures and post-treatment
Solution Approach 1:
The patent replaces the arc-based thermal process of conventional welding with a friction-based mechanical process. Friction welding generates heat through mechanical friction between the joining surfaces, then uses axial pressure to forge a bond. This process occurs in a controlled, contained manner without the open arc, sparks, or fumes associated with conventional welding, eliminating the need for extensive safety measures and post-treatment while maintaining strong bonds.
Solution Approach 2:
The patent converts the potentially harmful friction and heat generation into a beneficial controlled process. Instead of uncontrolled arc welding that produces sparks and fumes, the friction heat is generated locally and precisely at the joining interface, and the mechanical pressure controls the bonding process. The friction that would normally be considered a harmful waste of energy is converted into the useful heat source for creating the bond, eliminating harmful emissions while achieving strong joints.
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 varied material combinations, reduces manufacturing costs, and minimizes safety and post-treatment requirements by ensuring a strong bond without sparks, smoke, or weld spatters, while maintaining optimal flow and strength characteristics.
Implementation Method 1
the two portions are joined by means of friction welding or have a friction-welded joint with one another
Data Source
AI summary
A component of hydraulics, via which a pressure medium connection or flow can be controlled, includes a first portion which is additively manufactured at least in part and on which there is formed at least one control geometry for controlling the pressure medium connection or flow, and a second portion joined thereto.