What type of brazing rod would I need to buy to do this! Will be wanting to braze thin copper pipeto thin sheet metal.do I need to buy flux separately or are the flux coated rods okay! Does not have to be super strong. Cheers.any links to suitable rods on here greatly appreciated!
mrfxit,
Sep 1, 12:02pm
Separate flux VERY clean metals VERY steady welding hand Lots & LOTS of due care
Steady as she goes boys
Tricky-ish but doable if you have half an idea on applying the correct heat to where
mrfxit,
Sep 1, 12:02pm
Solder maybe better in this case
ambo11,
Sep 1, 12:07pm
Cheers, I'm guessing around a 95% tin/5% silver content in the rods would be okay! Know how to do it but am unsure on correct rods. It has to withstand severe heat with vibration, but won't have any direct weight ever put on it. Cheers for that.
elect70,
Sep 1, 12:13pm
Silfoss 15&powder fluxdip rod in itgentle heatdont get it red hot, just enough tolet thesilfoss flow . Use this often for copper to steel pipe joinsin fridgeworkegpipe to compressor
ambo11,
Sep 1, 12:19pm
Cheers, Silfos should be pretty easy to buy, thanks for that!
mrfxit,
Sep 1, 1:23pm
Yea was thinking of silfos but, just not cheap 2 very different melting points & under the eaves of a pipe . mmmm
Set up a test section first to 'get it right'
lookoutas,
Sep 1, 3:17pm
Sil-Fos would be my first choice as well.
ambo11,
Sep 1, 3:22pm
Is Sil fos is okay to braze copper pipe (thin) to thin sheet metal!, or is it for copper to copper only! Can you get brazing rods for steel to steel brazing!
taipan4,
Sep 1, 3:42pm
silfos iswhat plumbers use & is fine for steel to copper.Steel to steel I would usebronze rod & flux, or steel filler rods, or depending on skill level, TIG
gsimpson,
Sep 1, 3:47pm
Easyflo is more expensive but is more accommodating to dissimilar brazing
msigg,
Sep 1, 4:17pm
yea your on the right track, test piece is a good idea, i would concentrate nearly all the heat to the steel, just waving slightly over the copper occasionaly. Good luck.
mrfxit,
Sep 1, 4:35pm
Might end up half & half heat Copper is a brilliant conductor/heatsink Thin steel heats really fast in localized areas
mantagsi,
Sep 1, 5:17pm
FWIW I work in a major refrigeration engineering workshop; when brazing steel to copper (ie; heat exchangers etc) we use easyflo 34% and flux, works a treat and gives a nice finish, and not difficult. Using regular 15% silfos is mostly appropriate for copper to copper brazing. Do what you want, its no worry, but from thousands and thousands of welds I personally recommend using easyflo. Good luck either way :)
richard198,
Sep 1, 7:40pm
For steel to steel, use brass. (Braze 450 etc!)
sr2,
Sep 1, 7:45pm
+1 for easyflow, love that capillary action!
the-lada-dude,
Sep 2, 6:59am
i'm sure the rods were graded as easiest to more difficult to use : easyflow< ---------> siverloy<----------->silfous
lookoutas,
Sep 2, 7:32am
I always used the one that was free - but that's a good analogy, easyflow having the lowest melting point!
Which would be the strongest!
the-lada-dude,
Sep 2, 7:55am
mmmmmm. goggle that one
mantagsi,
Sep 2, 8:26am
I could be wrong but I imagine that the strength question is going to depend a lot on what it is you are trying to achieve. For example I had to rescue my old vw beetle with a snapped clutch cable, so I brazed the two halves together with a spare stick of easyflo. The repair was bloody strong but it also was a bit brittle, as the easyflo coated the cable strands and took out the flexibility in that section, making a strong repair actually quite weak (but it got me home!) What is it you are going to do!
lookoutas,
Sep 2, 9:58am
My intelligence Hmmmm - sez that the alloy with the lowest melting point would be the weakest. That's the case with solder anyway. To pinch/copy the lada fulla's analogy - easyflow (lowest melting point = weakest) < ---------> siverloy <-----------> silfous, add <----------> bronze (highest melting point = strongest)
ambo11,
Sep 2, 7:02pm
Its actually just for 2 stroke muffler modifications, so will get hot, but won't have any "weight" put on the brazes apart from small patches of copper etc. Thanks for all replies and advice from all!
purple666,
Sep 2, 7:21pm
And you sure don't want any leaks at a guess!
ambo11,
Sep 2, 7:34pm
Well it's more for deflectors etc, so won't actually be "sealing" the exhausts as such, will be having a practice and play for a while to start with.
sr2,
Sep 2, 7:54pm
I spent a lot of time repairing; modifying and eventually building expansion chambers some years back during my ???2 stroke era??
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