Differences between Welding, Brazing, and Soldering
Welding, brazing, and soldering are three important fabrication processes for joining metals and alloys. While these processes may appear similar to the untrained eye, there are considerable differences between them.
Let’s take a closer look at how these three techniques differ in terms of temperature difference, joint strength, filler metal, and applications.
One of the main differences between these three joining processes is temperature. The temperature can go much higher in welding than in brazing and soldering. For instance, in arc welding, the temperature goes beyond 5,000 ℃. Whereas brazing takes place in intermediate temperatures, i.e., 450 to 750 ℃. The soldering occurs even at a much lower temperature (below 450 ℃).
Strength of Joint:
Welded joints are much stronger than brazed and soldered joints. Though the joints created through brazing may not be stronger than welded ones, they significantly have more strength than soldered joints.
The strength of these processes in the following order:
Welding >> Brazing >> Soldering
Depending upon the application, the welding operation can be completed with or without using any filler material. However, a filler material is required for brazing and soldering.
Though each of these processes technically does the same job, they differ in their applications. For instance, the soldering process is widely used in the electronics industry; for soldering wires on circuit boards.
The welding process has a wide range of applications in every industry; it is used to create permanent joints from the aerospace industry to the automotive industry.
Brazing often finds applications in the pipe and pressure vessel industry. It is used in leak-proofing metallic pipes, valves, connectors, etc.
Since we have covered in detail the differences, let’s see a summarized view of the differences between these three metal joining processes:
|Temperature||Higher up to 6,000 ℃||450 – 750 ℃||< 450 ℃|
|Strength of Joint||Strongest||Stronger||Weakest|
|Can it join similar metals?||No||Yes||Yes|
|Filler Metal||May or not be required||Required||Required|
|Applications||All types of heavy metal joining industry:|
|Leak proof Pipes, valves, connectors, and pressure vessels||Electronic Circuits|