cymaz Posted November 17, 2019 Share Posted November 17, 2019 I’m building a weather vane ( can’t say cock any more.....someone will get offended). I want to glue two copper tubes , one inside the other. I thought about brazing but as they won’t be subject to any temperature or stress I thought it might be easier with JB Weld. Good idea or no? Quote Link to comment Share on other sites More sharing options...
Don Fry Posted November 17, 2019 Share Posted November 17, 2019 Epoxy? Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 I could make a wooden bung to stop the epoxy running off down the copper pipe. I thought that JBW might stay where you put it. Is it as runny as Zap Epoxy? Edited By cymaz on 17/11/2019 17:42:38 Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted November 17, 2019 Share Posted November 17, 2019 I've used JB weld for a few jobs - extremely strong but quite stiff so needs a lot of mixing and working to make pliable. Should work OK for the weather cock I'd have thought. Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 Thanks C8, can you gently heat it to make it more workable, as you can with epoxy? Quote Link to comment Share on other sites More sharing options...
J D 8 Posted November 17, 2019 Share Posted November 17, 2019 As above JB should do the job, if you can roughen surface a bit it will help. Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted November 17, 2019 Share Posted November 17, 2019 I should mention that I used the high heat putty that you cut off what you need from a ' sausage'. Massively strong, I 'welded' a length of aluminium tube to a flat plate as a test piece. The tube broke before the joint when I tested it. The putty does soften with hand heat as you work it. A bit stiffer than glazing putty, but easy to work into a fillet. Edited By Cuban8 on 17/11/2019 17:56:48 Quote Link to comment Share on other sites More sharing options...
Wingman Posted November 17, 2019 Share Posted November 17, 2019 Copper pipe? - Solder Quote Link to comment Share on other sites More sharing options...
paul d Posted November 17, 2019 Share Posted November 17, 2019 Exactly wingman, really wouldn't bother messing about with glue.. Quote Link to comment Share on other sites More sharing options...
will -0 Posted November 17, 2019 Share Posted November 17, 2019 JB weld is basically (as far as I can tell) epoxy thickened with powdered metal. It is very stiff once mixed although like any epoxy, temperature makes it both more runny and faster setting. I would use solder for this as if you get the pipe warm enough and it's a good enough fit it should flow up the gap ( plumber's torch etc.) If you happen to know a plumber who is amenable, it might even be worth asking them to do the job as you'll only get one shot at it. One downside of solder is that if this is going to be outdoors (and that would seem a very good idea for a weather vane) you'll likely get some corrosion around the joint . Edited By will -0 on 17/11/2019 18:27:08 Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 I would use solder but for two reasons the joins are quite wide, 2-3mm in some places I don’t own a big enough gas torch to get enough heat into the workpiece Quote Link to comment Share on other sites More sharing options...
will -0 Posted November 17, 2019 Share Posted November 17, 2019 PS most flying clubs just use a windsock..... Quote Link to comment Share on other sites More sharing options...
will -0 Posted November 17, 2019 Share Posted November 17, 2019 hello, in that case i'd stlll use solder but look to sleeve the inside pipe first to fill the gap. If necessary, split a pipe lengthways so that it'll go over Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 Posted by will -0 on 17/11/2019 18:33:43: PS most flying clubs just use a windsock..... If it were Wyoming, they would use a length of chain on a stick Anyway.....this is for Mrs C. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted November 17, 2019 Share Posted November 17, 2019 Lads, for this job, superglue, or even Boss White, will do until Cymas shuffles off this mortal coil. What's easy, in stock? Mrs C will judge a. neat b. does not fall apart. Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 17, 2019 Share Posted November 17, 2019 I'm sure JB Weld would do the job very well. It does take at least a day to set properly in my experience but, if you're not in a hurry it really is good stuff. Moreover it's readily available in car spares shops and there are several within 3 miles walking distance for me. Many years ago I made a Heathkit anemometer and wind direction indicator for the dinghy racing club where we sailed. The display was in the clubroom/bar and was a subject of fascinatíon, especially if the wind's strength made sailing either very difficult or suicidal depending on how brave you were. At least Kingsmill hospital, which made the wind a little unpredictable due to its proximity was handy if a trip to A&E became necessary Geoff Quote Link to comment Share on other sites More sharing options...
Malcolm Fisher Posted November 17, 2019 Share Posted November 17, 2019 Cymaz, Solder would be my preferred option, but failing that I would use Milliput epoxy putty. It sets under water which can be an advantage sometimes. Malcolm Edited By Malcolm Fisher on 17/11/2019 20:23:22 Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 Posted by Don Fry on 17/11/2019 19:01:26: Lads, for this job, superglue, or even Boss White, will do until Cymas shuffles off this mortal coil. What's easy, in stock? Mrs C will judge a. neat b. does not fall apart. Cheers Don but I’m not that old ! There’s plenty of years left in the old dog yet ! Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 17, 2019 Author Share Posted November 17, 2019 Posted by Malcolm Fisher on 17/11/2019 20:22:08: Cymaz, Solder would be my preferred option, but failing that I would use Milliput epoxy putty. It sets under water which can be an advantage sometimes. Malcolm Edited By Malcolm Fisher on 17/11/2019 20:23:22 Thanks, will look that up Quote Link to comment Share on other sites More sharing options...
Foxfan Posted November 18, 2019 Share Posted November 18, 2019 Milliput is not an adhesive and the slightly different newer formula is even less adhesive (except on your hands). Believe me I make whole model cars from it. I'm on my 7th pack this year. I know Milli. JBWeld, however, is massively strong and very workable. I know racing car restorers who use it where no other repair has done the job. Engine blocks and even cylinder heads repaired with it . ON RACING CARS!!! If you can't heat the joint enough for solder, then JBWeld is the answer. I was using it just this evening to glue brass to plastic where there was no room for even a small screw. BTW, solder won't corrode. It's uncleaned flux that corrodes. My Dad was a proper craftsman plumber and would solder zinc and lead flat roofs, using a half pint blowlamp, a stick of tinman's solder and a tallow pad, but was always very careful to clean the joint thoroughly. Martin Quote Link to comment Share on other sites More sharing options...
Alan Hilton Posted November 18, 2019 Share Posted November 18, 2019 I fixed a 90 size heli engine with a hole in the crankcase with JB .It was for a mate who deals in rubbish and I didn’t think it stood any chance of working .It was compleatly successful and has lasted for many flights so far Alan Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 18, 2019 Author Share Posted November 18, 2019 You’ve all convinced me. JB Weld on order Quote Link to comment Share on other sites More sharing options...
Foxfan Posted November 18, 2019 Share Posted November 18, 2019 Just make sure you mix the Hell out of it and when you think you're done, mix it some more! Like all epoxies in fact, but that's the only safety measure for getting a great result. The beauty of one black one white resin is that mixing means a nice even grey is your best guide. Best of luck. Martin Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 18, 2019 Author Share Posted November 18, 2019 Will report back when done Quote Link to comment Share on other sites More sharing options...
flight1 Posted November 18, 2019 Share Posted November 18, 2019 JB weld will work just remember to mix accurately and well and where you want it stuck lightly key the surface and make sure it grease and dust free. used it a lot on that Hanriot of mine cabines and undercarriage parts takes a week in a warm place to competly cure to full strength ( ie 90 odd percent on a day rest over a few days Quote Link to comment Share on other sites More sharing options...
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