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Author Topic: Phosphorus bearing brazing rod question  (Read 3123 times)

nick_75au

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Phosphorus bearing brazing rod question
« on: January 01, 2010, 07:57:27 am »
I have a copy of the AMBSC code for building small boilers, it specifically states silver brazing (containing phosphorus) and copper phosphorus rods shall not be used. Does anyone know the reason?
Nick
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andrewh

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Re: Phosphorus bearing brazing rod question
« Reply #1 on: January 01, 2010, 05:05:15 pm »
Nick,

Happy new year in Oz!
A tentative answer to your question till John (Bogstandard)  sees it and gives the authoritative answer :}

I seem to remember that the phosphorous causes or can cause embrittlement in the joint - I think it affects the rate of cooling and the strucure of the soldered joint.
For a boiler we are requiring properties of strength with ductility and corrosion resistance, and generally phosphorous increases hardness at the expense of ductility.

rgds
andrew

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HS93 (RIP)

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Re: Phosphorus bearing brazing rod question
« Reply #2 on: January 01, 2010, 05:16:20 pm »
Unfortunately John is no longer a member

peter
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