Bonded Brazing Ring System for Tube Retention
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Solution Overview
Problem
Brazing rings often fall off return bends during transit due to softening tension caused by time, environmental conditions, and jarring, leading to potential losses before the brazing operation can be completed.
Innovation Solution
A brazing ring system where a solvent, such as acetone, is applied to the tube ends to partially activate the binder in the flux, creating a strong adhesive bond between the brazing ring and the tube, ensuring the rings remain securely attached during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brazing ring is expanded and placed on a tube end to hold it mechanically, then the ring can be secured to the tube, but the tension holding the ring softens over time due to environmental conditions and jarring, causing the ring to fall off
Solution Approach 1:
A flux-binder material is introduced as an intermediary between the brazing ring and the tube surface. This binder creates a chemical adhesive bond that supplements the mechanical expansion fit, preventing the ring from falling off during transit. The binder acts as a mediator that maintains the connection between the ring and tube throughout the supply chain.
Solution Approach 2:
The chemical state of the flux-binder is changed from dormant to activated through exposure to moisture or heat during the brazing process. This parameter change transforms the binder from a passive adhesive layer to an active bonding agent, ensuring the ring remains securely attached to the tube end throughout handling and transit.
2Strength
If the brazing ring is tightly expanded onto the tube end to prevent falling off, then the ring adheres better, but the ring may become difficult to remove or damage the tube end
Solution Approach 1:
The brazing ring is expanded slightly beyond the minimum diameter needed for basic fit, creating a moderate interference fit that provides sufficient mechanical retention without excessive force. This partial expansion, combined with the flux-binder adhesive, achieves strong bonding while maintaining ease of removal during the brazing operation.
Solution Approach 2:
The connection system uses a composite approach combining mechanical expansion (physical interference fit) with chemical adhesion (flux-binder bonding). This composite mechanism distributes the holding force between mechanical and chemical means, achieving strong attachment that remains removable when needed for brazing.
3Device complexity
If no additional securing method is used beyond mechanical expansion, then the process remains simple, but the brazing ring falls off during transit due to softening tension
Solution Approach 1:
The flux-binder material is already present on the tube end or applied as part of the standard preparation process, eliminating the need for separate adhesive application steps. The binder activates automatically through exposure to moisture or heat during normal handling and brazing preparation, providing secure retention without adding complex equipment or procedures.
Solution Approach 2:
The flux-binder transitions from a dormant state to an activated bonding state through environmental exposure during normal handling and storage. This automatic parameter change (from inactive to active adhesive properties) provides reliable ring retention without requiring additional active control systems or complex application procedures.
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 effectively prevents brazing rings from falling off during transit, ensuring safe and reliable transport of return bends loaded with brazing rings, ready for the brazing operation.
Implementation Method 1
a layer of a solvent or a solvent with binder is interposed between the outer surface of the first end portion of the tube and the exposed surface of flux. The solvent or solvent with binder acts to adhere the brazing ring to the end of the tube.
Implementation Method 2
The solvent can be, for example, acetone. Acetone causes a binder in the exposed flux to partially activate and adhere to the end portion of the tube.
Data Source
AI summary
A bonded brazing ring secured to an end of a tube having a solvent or a solvent with a binder applied to the surface of the tube, and a method of adhering a brazing ring to a tube using a solvent or a solvent with a binder is provided. The brazing ring is secured to the tube prior to a brazing operation.