These are mainly three types of joints between two metals. To join two metals, different kinds of techniques are used, and these two are the names of such two techniques. The big difference is the use of temperature and the use of another filler metal for joining. The Welding technique uses filler metal to join both metals. On the other hand, the welding technique joins both metals by fusion.
- Welding fuses materials by melting them, while brazing uses a filler metal to join materials without melting them.
- Welding requires high temperatures, above 500°C, whereas brazing uses lower temperatures, below 450°C.
- Welded joints are generally stronger than brazed joints, making welding suitable for structural applications and brazing for decorative purposes.
Welding vs Brazing
Welding involves heating the metal to its melting point and then joining the pieces together. Brazing involves heating the metal to a lower temperature than its melting point and using a filler metal to join the pieces. Welding can be used to join similar or dissimilar metals, unlike brazing.
The welding joint is when two metals are fused. When needed to join base metals, these metals are heated at the place of the joint. The temperature should be above the melting point of the base metals. Thus, this melts the metals and fuses both pieces together. These joints are made without any use of third-party metal or filler metals.
The Brazing joints are quite different from the process of fusion. In this technique of joining, a third metal or filler metal is used to join the base metal. The temperature used is lower than the melting point of base metals. To join these base metals without fusion, a metallurgical bond is created.
|Parameters of Comparison||Welding||Brazing|
|Temperature Used||Higher than the melting point of the base metals. (Can go up to max. 3800°C)||Lower than the melting point of the base metal. (Can go up to max. 600°C)|
|Distortion and Stress||High distortion and Stress is seen in the metals||Low distortion and Stress is seen in the metals|
|Tensile Strength||The Tensile Strength is seen to be >200MPa||The Tensile Strength is seen to be between 100-150MPa|
|Use of Filler Metals||NO||YES|
|Types of metals it can join||Only metals with similar composition and melting temperature can be joined.||Any kind of metal can be joined.|
What is Welding?
These are the kind of joints that are made between thick metals and have mainly one single point of interaction. In this joint, the pinpoint of the metal where the joint is to be done is heated. The temperature should be more than the melting temperature. As the metals become heated, both are fused.
The meaning of fusion is the process of joining metals by creating a weld pool. The same kind or type of metals are heated above their melting temperature, which forms molten materials called weld pools. Brought together, these molten metals are joined together to form a very strong bond.
These kinds of joints have a great advantage in smaller rather than large areas. The Welding joints also can be divided into many types. Some of them are Plastic welding, Electro-slag welding, Gas metal arc welding, Gas tungsten arc welding, Flux-cored arc welding, Glass welding, Oxy-fuel welding, Shielded metal arc welding, and Submerged arc welding.
What is Brazing?
These kinds of joints work in any kind of metal. The metals don’t precisely have to be the same kind but can also be two different kinds. In this kind of joint, an extra metal, mainly called filler metal, is added between the base metals’ joints.
The base metals’ temperature is heated and brought a little less than the melting point. As the base metal gets heated enough, the filler metals are touched with the heated base metals. This melts the filler metals.
The liquid filler metals travel through all the gaps and fill them. This step is also called wetting. The liquid, as it gets cooler, gets hardened. This joins the base metals together and makes it a metallurgic bond. The principle of Capillary action works in the process of creating the joints.
There are mainly 7 types of brazing heating methods: Torch or manual brazing, Furnace Brazing, Silver brazing, Braze welding, Cast-iron welding, Vacuum brazing and Dip brazing. Some of the metals that can be used as filler metals are silver, copper, aluminium, zinc, etc.
Main Differences Between Welding and Brazing
- Welding joints are used in construction, repair shops, bridges, aircraft, railways, etc. On the other hand, Brazing joints are used in electronic or electrical things, jewellery, etc.
- Welding doesn’t give a fine look and is not used in products that require a better look, while Brazing gives a better finishing look.
- In Welding joints, as the base metals are melted, they might lose some properties sometimes, while Brazing removes this chance as the base metals are not melted in this type of joint.
- Welding requires much more heat than Brazing which also makes a difference in the cost.
- Welding makes a fusion in the base metals, so it is stronger than the Brazing joint.
- The base metals should be of the same composition in the case of Welding, while for Brazing, it doesn’t matter.
- The process of Welding takes much more efficiency, while Brazing joints are easy and are much more widely used.
- The process of Welding is rarely used for mass production, while Brazing joints are much more preferred for mass production because of their easy, efficient, and finishing look.
- For Welding, different temperatures are used for different metals, while for Brazing, temperatures are quite the same throughout the process.
- The process of Welding either fastens the properties of rusting than the base metals. On the other hand, Brazing makes minimal changes in the rusting properties of the metals.
I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️
Piyush Yadav has spent the past 25 years working as a physicist in the local community. He is a physicist passionate about making science more accessible to our readers. He holds a BSc in Natural Sciences and Post Graduate Diploma in Environmental Science. You can read more about him on his bio page.