Superheaters

[BazParticipant @baz89810]

I wonder if some of the Loco builders could advise me on what alloys to use when making superheaters. I am about to attempt my first set of superheater elements, made from copper and I am unsure what brazing alloy to use on the return bends. The bends are contained within the tube as opposed to protruding through into the firebox as a radiant type. I have available the standard easyflo no2 also C4 and B6 alloys, I dont know what the modern classification for them is, Can the smokebox end joints be done in easyflo? Thanks for reading this.

Baz  

[BazParticipant @baz89810]

[WearyParticipant @weary]

From memory Martin Evans used to suggest using B6 (Silverflow 16) at the hot (return bend) end in conjunction with Tenacity 5 flux  as the melting temperature of B6 is 790-830 degrees C. .  Easyflow No.2 is suitable only for the cooler end (wet header) joints.

 

I have not used B6 but have used Sifbronze (890 degrees C).

 

Regards, Phil

[Speedy Builder5Participant @speedybuilder5]

Bill Steer wrote an article in ME  4369 Jan 2010 and 4370 where he used a SIFBRONZE brazing alloy.  Article shows brazing jigs, tube cutting angles and gas torch used etc.

[Author]

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