Closed Socket Brazed Joint Assembly for Complete Gap Filling
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Solution Overview
Problem
Brazed joints, particularly socket joints in induction motor rotors, face challenges with incomplete filling by brazing fill material, trapped flux and gases, and reduced faying surface area, leading to weakened joint strength and reduced electrical conductivity.
Innovation Solution
A closed socket brazed joint assembly with a socket having faying surfaces separated by a fillet, where a slug of brazing fill material is placed between the faying surfaces, and upon energy application, the fill material melts and flows to fill the gap, enhancing capillary action and flux exfiltration, while indexing guides align the faying surfaces for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a closed socket joint is used, then the joint structure is compact and manufacturing is simplified, but the brazing fill material may not completely fill the joint and flux/gases become trapped
Solution Approach 1:
The patent introduces indexing guides that protrude into the socket before brazing to pre-position the faying surfaces at the correct orientation and location. This preliminary alignment action ensures that when the brazing fill material is applied, the surfaces are properly positioned to allow complete filling and flux exfiltration, resolving the contradiction between compact structure and filling completeness.
2Strength
If the faying surfaces are closely fitted, then the joint strength is maximized, but the brazing fill material has difficulty flowing into the gap
Solution Approach 1:
The patent applies local quality by creating a non-uniform gap distribution through the indexing guides. The gap is larger in specific locations where the indexing guides protrude, allowing brazing fill material to easily flow in, while maintaining closely fitted surfaces in other areas to ensure strong joint strength. This localized variation in gap size resolves the contradiction between strength and material flow.
3Object-affected harmful factors
If flux is applied to prevent oxide formation, then oxidation is prevented during heating, but flux residues remain in the joint and weaken it
Solution Approach 1:
The patent extracts the harmful flux residues from the joint by designing the socket with specific geometry and indexing guides that create pathways for flux exfiltration. The indexing guides protrude into the socket to position surfaces in a way that allows flux to be pushed out during brazing, separating the beneficial oxide prevention function from the harmful residue retention problem.
4Strength
If the faying surfaces are precisely aligned, then the joint strength is optimized, but alignment precision is difficult to achieve manually
Solution Approach 1:
The patent implements self-service by incorporating indexing guides that automatically align the faying surfaces during assembly. The guides protrude into the socket and physically constrain the positioning of the members, causing them to self-align at the correct orientation and location without requiring manual precision alignment, thus achieving both strength and manufacturing ease.
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
The solution ensures complete filling of the joint, reduces trapped gases and flux, increases faying surface area, and enhances mechanical and electrical strength by optimizing the flow of brazing fill material and alignment of faying surfaces, thereby improving the overall quality and reliability of the brazed joint.
Implementation Method 1
heating either the whole or part of the structural members forming a joint to a temperature sufficient to melt a third material (e.g., brazing fill material or BFM) that then either wicks, flows, or utilizes capillary action to fill a gap between overlapping or adjoining surfaces
Implementation Method 2
heating either the whole or part of the structural members forming a joint to a temperature sufficient to melt a third material
Implementation Method 3
the finished strength of the final joint derives from how well the BFM flows or wicks into the gap between the base materials, evenly contacting the faying surfaces, and solidifies
Data Source
AI summary
A closed socket brazed joint assembly includes a first member, a second member with a first end having first and second faying surfaces, a socket in the first member that receives the second member with a faying surface with at least two portions separated by a first fillet. Before application of energy to the joint, there is a gap between the faying surfaces of the first and second members. A slug of brazing fill material is between the first end of the second member and at least one faying surface of the socket. Upon application of energy, the brazing fill material melts and flows from between first end of the second member and the at least one faying surface of the socket to fill the gap between the faying surfaces of the first and second members.