Oxygen is used in brazing primarily to control the atmosphere and prevent oxidation of the metal surfaces being joined.
This enhances the cleanliness and integrity of the braze joint.
It is crucial for ensuring that the molten filler material can wet and flow properly over the base materials.
This leads to a strong and reliable joint.
Why is Oxygen Used in Brazing? 5 Key Reasons Explained
1. Prevention of Oxidation
Oxygen is carefully controlled in brazing processes to prevent oxidation of the metal surfaces.
Oxidation occurs when metal atoms lose electrons to oxygen atoms in the air.
This process accelerates with heat.
Oxidation can form a barrier that prevents the molten filler material from properly wetting and bonding with the base metal.
By controlling the oxygen levels, the surfaces remain oxide-free.
This facilitates better wetting and flow of the filler material.
2. Enhanced Cleanliness and Integrity of Braze Joints
The reduction of surface oxides through controlled oxygen levels improves the cleanliness of the joint area.
This cleanliness is essential for a strong braze.
Any impurities or oxide layers can weaken the joint.
The integrity of the braze joint is crucial for the durability and reliability of the welded components.
This is especially important in applications like aerospace and medical devices where failure is not an option.
3. Increased Options for Braze Alloys and Parent Materials
Controlled oxygen environments in brazing ovens allow the use of high vapor pressure braze alloys and parent materials.
These might otherwise be unsuitable for brazing within a vacuum atmosphere.
This flexibility expands the range of materials that can be successfully brazed.
It enhances the applicability of brazing in various industries.
4. Application in Various Industries
The controlled use of oxygen in brazing is beneficial across multiple sectors.
These include medical devices, electronic devices, and aerospace parts.
These industries require precision and reliability.
These are facilitated by the clean, high-quality joints achievable through oxygen-controlled brazing processes.
5. Comparison with Other Methods
While oxygen brazing might not be as strong as welding, it is a viable option for parts not subjected to load/tension or high temperatures.
It is also useful for repairing hard-to-weld materials like cast iron where traditional welding processes have failed.
Continue exploring, consult our experts
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