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Soldering brass to copper

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Soldering brass to copper

Unread postAuthor: elitesniper » Sat Dec 12, 2009 3:02 pm

So im just wondering i have a 1/4 brass nipple and the output of my new air conditioner compressor has a small copper tube sticking out when i slide the nipple over it it is really snug and just like a fitting.. would it be ok to solder them togther just like copper to copper?
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Unread postAuthor: ALIHISGREAT » Sat Dec 12, 2009 3:08 pm

Should be since brass is an alloy of copper and zinc... i have also had brass solder fittings before (endfeed -> thread couplers for example) in brass.
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Unread postAuthor: Biopyro » Sat Dec 12, 2009 4:44 pm

Yes it would. Brass is often used for threaded endfeed fittings in the UK, as ALIHISGREAT said.
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Unread postAuthor: c11man » Sun Dec 13, 2009 5:48 pm

i would just use a compression fitting instead of soldering
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Unread postAuthor: SpudBlaster15 » Sun Dec 13, 2009 6:03 pm

A solder joint derives a large amount of its strength from an alloying process of sort. Copper is partially soluble in the molten soldering alloy, which means that some mixing will occur at the interface of the joint. When the joint cools, the solder and pipe have been effectively fused together.

As brass typically contains a large proportion of copper, the same process will occur, and it can be soldered effectively.
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Unread postAuthor: metalmeltr » Fri Dec 18, 2009 9:53 am

You should not have any problems. Plumbers solder brass to copper all of the time. Valves that are designed to be soldered to copper pipe have brass bodies.
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