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Epoxying Brass

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Epoxying Brass

Unread postAuthor: Mitchza89 » Sat Sep 08, 2007 7:15 pm

Hey guys,

I don't have the propper gear to sodler brass so would Araldite Epoxy hold brass at 350+ psi?
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Last edited by Mitchza89 on Sat Sep 08, 2007 7:22 pm, edited 1 time in total.
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Unread postAuthor: DYI » Sat Sep 08, 2007 7:19 pm

I don't know how far into the "+" range it would hold, but properly mixed and applied epoxy should be okay for 350 psi.
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Unread postAuthor: Mitchza89 » Sat Sep 08, 2007 7:21 pm

No worries, thanks alot for that. If not, I'll go to a metal work shop and get one of the blokes there a few bucks to solder it up for me.
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Unread postAuthor: MrCrowley » Sat Sep 08, 2007 7:24 pm

Araldite?! Isn't that stuff like glue? I would trust JB Weld up to 150psi, 200 maybe, but unless its copper epoxy on copper I wouldn't trust it that high, just get someone at a garage to braze(sp?) it for you.
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Unread postAuthor: SpudBlaster15 » Sat Sep 08, 2007 7:27 pm

Any good quality epoxy will hold properly prepared metal fittings together at pressures in excess of 300psi. This includes JB weld, Araldite, etc.
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Unread postAuthor: MrCrowley » Sat Sep 08, 2007 7:33 pm

What exactly is it holding? If the fitting is under alot of strain I wouldn't take it very high, like if it's holding a chamber together.

A common problem I have with JB weld is, if the joint where it is applied gets knocked slightly when under strain it cracks very easily.

I tried to use JB Weld to secure a brass fitting to a FE as my chamber, I bumped it slightly on a corner of my work bench and the damn FE flew of and into my garage wall.
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Unread postAuthor: Mitchza89 » Sat Sep 08, 2007 7:33 pm

Cheers lads, thanks alot. How would you prepare the fittings though? Just wash it properly with metho?

Well I can't find a 5/16th tube bush or a compression fitting because in that size, just way too hard to find so I'm going to drill a hole in a brass end cap and hopefully epoxy it in.
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Unread postAuthor: SpudBlaster15 » Sat Sep 08, 2007 7:36 pm

Sand the pipe and fittings with medium grit sandpaper or emery cloth. If the fittings are properly sanded, and the epoxy is properly mixed and applied, the joint should hold at least 300psi.
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Unread postAuthor: Mitchza89 » Sat Sep 08, 2007 7:40 pm

Cheers for that. On a more possitive note, I bought my shock pump last night. a 360psi monster for 25 bucks and that includes delivery! booyah!
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