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Post by crowsfoot on Jan 20, 2018 19:35:15 GMT
Nice video tom, I think you may have answered something that I've been trying to get my head round for a while.
When I was doing metal work (many years ago at school) we heated up the metal to cherry red then added a flux followed by the brazing rod which was held in place until the brazing rod ran into the metal and this was what we then called brazing (definitely using ordinary gas, not oxy-acetylene), which I now know (thanks to toms tips) was more likely to have been called phosphorus brazing.
This was also how I fixed my "broken toms grips" (now wish I'd have done a video of that repair).
When I was an apprentice in the mid seventies the gaffer of the firm where I worked would often repair a repairable cylinder by taking it back to the yard and finding the small leaky pin holes on the seam and then brazing them up using oxy-acetylene (which I thought was really a bronze welding of a sort).
At college we learnt to do bronze welding on copper using oxy-acetylene (which definitely wasn't brazing) and you had to be very careful not to melt right through the copper.
Tappy,
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Post by tomplum on Jan 20, 2018 19:52:56 GMT
the only differance to my understanding is, if your using flux, that powery stuff in a tin, you dip the rod in, its brazing, if you don't need flux and it works then the flux is in the rod which means its phosphorus brazing or sliversoldering,
eitherway its a lot easier with oxy/acetalene, modern torches, rothy or brenz are good especialy with mapp gas but if there's water there you will struggle,
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Post by crowsfoot on Jan 21, 2018 15:17:22 GMT
I do like the look of that Chinese blow torch tom, however all I've ever used is the old fashioned primus bottle and torch and I think I would need to buy an adaptor for that Chinese torch to fit onto my primus bottle (which would probably cost more than the Chinese torch does)! The torch that I used in school metal work I remember was very powerful one and had a wide full flame - the steel we was brazing would have to glow cherry red and we defiantly had a flux and the joined brazed metal was bronze/yellow in colour when done. On my grip repair the braze is silver not bronze? If truths known I'm still a bit confused. Maybe I'm not remembering it quite right and it was indeed oxy-acetylene that we used at school (it was a long time ago), in fact that's the only logical explanation I'm now left with! A lot of the kids were shit frit of that powerful gas torch and I would often get the job of secretly brazing up their project (behind teachers back and risking detention).  |
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Post by dickpuller on Jan 21, 2018 18:55:36 GMT
I do like the look of that Chinese blow torch tom, however all I've ever used is the old fashioned primus bottle and torch and I think I would need to buy an adaptor for that Chinese torch to fit onto my primus bottle (which would probably cost more than the Chinese torch does)! The torch that I used in school metal work I remember was very powerful one and had a wide full flame - the steel we was brazing would have to glow cherry red and we defiantly had a flux and the joined brazed metal was bronze/yellow in colour when done. On my grip repair the braze is silver not bronze? If truths known I'm still a bit confused. Maybe I'm not remembering it quite right and it was indeed oxy-acetylene that we used at school (it was a long time ago), in fact that's the only logical explanation I'm now left with! A lot of the kids were shit frit of that powerful gas torch and I would often get the job of secretly brazing up their project (behind teachers back and risking detention). The Chinky blow lamps are amazing value CF & great quality too - as Tom will confirm. You can get a bottle of Propane MAPP style for about a tenner & have your Chinky blow lamp as a standby. As said these rods are great for Fridge work, but also for crimping over copper tube & sealing as temporary plugs. Another thing they’re good for is joining 15 to 8/10mm in copper if you don’t have a reducer; just crimp the 15mm over the smaller tube & join them with this rod. |
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Post by crowsfoot on Jan 23, 2018 20:26:23 GMT
Just ordered one Dick. The problem at work with the primus bottles has now ceased to be because the firm I work for cannot supply them anymore so I've been told to buy (book) disposable gas bottles from now on (I wasn't ever going to buy my own gas). So the Chinky torch is now on it's way to Yorkshire and I'm very much looking forward to giving it a go  . Tappy, |
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Post by Deleted on Jan 23, 2018 20:56:38 GMT
Just ordered one Dick. The problem at work with the primus bottles has now ceased to be because the firm I work for cannot supply them anymore so I've been told to buy (book) disposable gas bottles from now on (I wasn't ever going to buy my own gas). So the Chinky torch is now on it's way to Yorkshire and I'm very much looking forward to giving it a go . Tappy, We expect a video review from you tappy on your new torch  |
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Post by tomplum on Jan 23, 2018 21:06:37 GMT
you'll not regret it tappy, they are every bit as good as the rothy and seen to work better on mapp gas, |
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