Cast Component Hardpoint Insert for Fast, Reliable Joining
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Solution Overview
Problem
Current joining methods for cast aluminum components, such as fusion welding and mechanical fasteners, face challenges like slow processing, high maintenance, porosity concerns, and weight addition, which affect the structural integrity and efficiency in production facilities.
Innovation Solution
A cast assembly comprising a base component, a retainer, and an insert of different materials, where the insert is secured in a recess by a solid-state weld or additive manufacturing, and the second component is attached via a mechanical connection or resistance spot weld, ensuring a strong and reliable joint without the drawbacks of traditional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fusion welding (MIG or TIG) is used to join cast aluminum components, then the joining process can be performed with existing equipment, but the processing speed is slow and separate equipment is required
Solution Approach 1:
The patent replaces fusion welding (thermal process) with Resistance Spot Welding (electrical resistance process). The RSW process uses electrical resistance and pressure to create welds, eliminating the need for separate MIG/TIG equipment and significantly increasing processing speed while maintaining join integrity in cast aluminum components
2Productivity
If Resistance Spot Welding is used on cast aluminum components, then processing speed increases, but high current requirements and increased weld tip maintenance are needed
Solution Approach 1:
The patent modifies the RSW process parameters by using a specifically designed copper alloy insert with optimized electrical and thermal properties. This insert acts as an intermediary that distributes the high current more effectively, reducing peak current requirements and minimizing weld tip degradation, thereby reducing maintenance needs
3Productivity
If Resistance Spot Welding is used on cast aluminum components, then processing speed increases, but porosity in the cast workpiece may cause collapse or weakening during welding
Solution Approach 1:
The patent introduces a copper alloy insert as an intermediary component between the cast aluminum and the weld area. This insert has superior mechanical properties and is less susceptible to porosity-related failures. The insert absorbs and distributes the welding stresses, preventing collapse and weakening in the porous cast aluminum region while enabling faster RSW processing
Solution Approach 2:
The patent creates a composite structure by embedding a copper alloy insert within the cast aluminum component. This composite approach combines the casting advantages of aluminum with the superior weldability and mechanical properties of copper alloy, achieving both high productivity through RSW and high reliability by eliminating porosity-related failure modes
4Ease of manufacture
If mechanical fasteners are used instead of welding, then joining can be performed, but investment and maintenance requirements increase and weight is added to the structure
Solution Approach 1:
The patent merges the fastening function into the component itself by creating an integrated copper alloy insert that is directly resistance spot welded to the cast aluminum. This eliminates the need for separate mechanical fasteners, reducing overall weight and eliminating fastener inventory requirements while maintaining joining capability
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 the structural integrity and reduces maintenance by using a stronger insert material, maintaining the existing factory infrastructure, and distributing load effectively, thus improving the reliability and efficiency of the joining process.
Implementation Method 1
the retainer is joined to the base component by a solid-state weld
Implementation Method 2
The retainer secures the insert in the recess by covering a portion of a top surface of the insert
Implementation Method 3
a resistance spot weld between the second component and the insert
Data Source
AI summary
A multi-component structure includes a first component of a first material, an insert of a second material different than the first material, a retainer, and a second component. The first component includes a recess in which the insert is arranged. The retainer secures the insert in the recess by covering a portion of a top surface of the insert. To accomplish this, a) the retainer is joined to the first component by a solid-state weld or by solid-state additive manufacturing, or b) the base component and the retainer are of a one-piece construction and the retainer is of the first material. The second component is attached to the insert by a mechanical connection or by a resistance spot weld between the second component and the insert.