Difference Between Soldering Brazing and Welding

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Soldering brazing and welding are methods to join and fill gap between metal parts. Each joining process has their own significance. They are different in terms of base material to be joined, joining temperature and filler material. In this article we will discuss the difference between soldering brazing and welding. Read this article to know various sheet metal parts joining techniques.

Welding

Welding is a process to join two or more similar metals by melting base material or using filler Material. Sometimes pressure is also applied with heat to weld parts. Various processes are used to weld parts. Read this article to know the difference between TIG and MIG welding.

Base Material: For welding, Base material should be similar. For example, aluminum can not be welded with steel. For welding different material special welding process is used. 

Weld Strength: Strength of welded joint is equal to the strength of the base material.

Finish: Good surface finish in welded area can be achieved using post processing finish operations. 

Temperature: Welding is relatively done at higher temperatures compared to brazing and soldering. Welding temperature is kept higher than base material melting temperature.

Brazing

Brazing is a metal joining process where filler road is melted and filled into the joint. It does not involve melting the base material. Advantage of brazing is to join similar or dissimilar metals with considerable strength.

Base Material: Different base material can be brazed. For example, aluminum can be welded with steel sheets.

Joint Strength: Brazing joint can be stronger than base parts. But they are not as strong as welded joints.

Temperature: Brazing filler metal rod have lower melting temperature compared to base metals melting temperature.

Filler Material: Brazing requires brazing flux and filler rod to join parts.

Soldering

Soldering process is similar to brazing. But soldering is done at a relatively lower temperature compared to brazing. It is generally used to join electronics components. Gold, silver, copper, brass, and iron metals can be soldered. 

Base Material: Different base material can be soldered. For example, copper wires are soldered with aluminium components.

Joint Strength: Soldered joints has lower strength. Soldering is used to make electrical connections.

Temperature: Soldering is done at relatively low temperatures.

Strength : Soldering joint is not as strong as brazed or welding joint. Therefore soldering is only used to join electrical components to achieve connection.

Filler Material : Soldering requires soldering flux and filler rod to join parts.

Summery (Soldering vs Brazing vs Welding)

Parameter Welding Brazing Soldering
Base Material Similar Similar or Dissimilar Similar or Dissimilar
Process Temperature ~ 3400°C ~ 600°C ~ 400°C
Joint Strength Strongest joint High Low (Used for electrical connections)
Filler Material May or May Not Required Required Required

Conclusion

To sum up, Soldering is used to join electronics parts. It is used to make electrical connections. Whereas brazing is used to join dis-similar metals using filler rod. Whereas welding is used to join similar metals at very high temperature. 

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