Soldering

Difference Between Soldering Brazing and Welding

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 difference between soldering brazing and welding.

Welding

Welding is a process to join two or more similar metals by melting base material or using filler material. Sometimes pressure is also with heat to weld parts. Spot and seam welding are type of pressure welding.

Base Material : For welding, Base material should be similar. For example, aluminum can not be welded with steel.  

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

Finish : Good surface finish in welded area can be achieved after post processing operation. 

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.

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

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

Temperature : 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 it is done at relatively lower temperature to join generally 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. Because it is used to join electrical components to achieve connection.

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

Summery

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. 

Refer this article for sheet metal parts joining techniques.

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