[scherjeal]

Please let me know what is the difference between welding and brazing ??

[Braehill]

The short answer would be that welding melts the metals together and brazing only the filler metal is melted and it uses a capillary bond to hold the two metals together like in soldering.

Len

[scherjeal]

Thank you Mr. Len,

I am very new to this field. As you said brazing uses capillary bond to hold the two metals together like in soldering. Can you please let me know in detail about capillary bond...

Thanks and regards,

[Braehill]

Scherjeal,
The base metals (most times dissimilar) are heated to red hot or close to it but not to above their melting point. This opens up the pores in their grain structure and the filler metal, bronze and silver being two popular choices, are added to the heated joint, usually a lap joint, and when it cools it solidifies between them. This bond is surprisingly strong and usually water tight, you would destroy the base metal trying separate them.

Somebody here may have a more technical explanation of it ,but that's the nuts and bolts of it. Like I said, it's based on the same mechanics as a lead soldered copper pipe but usually at much higher temperatures, and usually done with an Oxy-Acetylene torch.

Len