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Brazing stainless steel - what's easiest?
I need to mend a small piece of stainless steel, it's essentially a
small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. -- Chris Green · |
Brazing stainless steel - what's easiest?
Chris Green wrote:
I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were 'thin plate' absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. -- Chris Green · |
Brazing stainless steel - what's easiest?
On Fri, 04 Oct 2019 13:31:24 +0100, Chris Green wrote:
I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? Are you sure you can get it hot enough? What gas will you be using? -- Leave first - THEN negotiate! |
Brazing stainless steel - what's easiest?
"Chris Green" wrote in message ... I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. --------------------------------------------------------------------------------- Silver Solder - Easyflo is you still have some or the non-cadmium equivalent such as Silverflo 55 Flux - you will need a flux such as Tenacity 5 which will still be active with prolonged heating. |
Brazing stainless steel - what's easiest?
Cursitor Doom wrote:
On Fri, 04 Oct 2019 13:31:24 +0100, Chris Green wrote: I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? Are you sure you can get it hot enough? What gas will you be using? Butane (I think), the slightly hotter of Propane and Butane anyway. However I'm moving towards Gasless MIG, I didn't realise you can get gasless stainless steel MIG wire. -- Chris Green · |
Brazing stainless steel - what's easiest?
In article ,
Chris Green wrote: I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? I've welded stainless with MIG wire from Halfords. Like much of my welding not pretty, but strong enough for the job. -- *TEAMWORK...means never having to take all the blame yourself * Dave Plowman London SW To e-mail, change noise into sound. |
Brazing stainless steel - what's easiest?
On Fri, 4 Oct 2019 14:43:14 +0100, David wrote:
"Chris Green" wrote in message ... I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. --------------------------------------------------------------------------------- Silver Solder - Easyflo is you still have some or the non-cadmium equivalent such as Silverflo 55 Flux - you will need a flux such as Tenacity 5 which will still be active with prolonged heating. At work I used oxy-propane for silver soldering and brazing. The fitters couldn't dp st. st. (it was an electronics factory - not much use for such tings). I tried some sort of 'ordinary' flux (ICR which - 30 years...) and of course it didn't work. Tried cleaning the pieces, applying a paste of the flux, leaving for about an hour and it worked! I never did tell them how I did it, so had to do all the odd bits that came along. I made a cage for a a 1.5 li bottle for my touring bike; it's still intact after tens of thousands of miles use. The frame did have 3 bosses on it - wouldn't have loaded 2 bosses like that, especially on 531. -- Peter. The gods will stay away whilst religions hold sway |
Brazing stainless steel - what's easiest?
Chris Green wrote:
Chris Green wrote: I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were 'thin plate' absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. https://bilba.com.au/products/gemini-680-weldall |
Brazing stainless steel - what's easiest?
On 04/10/2019 16:01, Chris Green wrote:
Cursitor Doom wrote: On Fri, 04 Oct 2019 13:31:24 +0100, Chris Green wrote: I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? Are you sure you can get it hot enough? What gas will you be using? Butane (I think), the slightly hotter of Propane and Butane anyway. However I'm moving towards Gasless MIG, I didn't realise you can get gasless stainless steel MIG wire. Personally I would try brazing. I *thought* propane was hotter than butane, anyway plenty hot enough for easyflo provided you can box it in with firebrick (I use the vermiculite blocks used for some woodburner stove linings). I don't think I have ever actually needed to braze stainless, but I do have some aggressive fluxes. |
Brazing stainless steel - what's easiest?
"Brian Gaff" wrote in message ... Would it not be easier to just get another bracket of some sort. Those brazed joints fall to bits, I had a speaker stand made of brazed SS and that fell to bits indoors! Properly brazed SS doesn’t. "Chris Green" wrote in message ... I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. -- Chris Green · |
Lonely Psychopathic Senile Ozzie Troll Alert!
On Sat, 5 Oct 2019 05:54:05 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Would it not be easier to just get another bracket of some sort. Those brazed joints fall to bits, I had a speaker stand made of brazed SS and that fell to bits indoors! Properly brazed SS doesn¢t. Just what the **** is wrong with you, senile pest? tsk -- Richard addressing Rot Speed: "**** you're thick/pathetic excuse for a troll." MID: |
Brazing stainless steel - what's easiest?
On Friday, 4 October 2019 20:54:16 UTC+1, Rod Speed wrote:
I have found that German silver (nickel silver) makes very nice brazed joints on stainless steel. I used the white powder flux that is supplied for dental orthodontic work. I suspect it is borax based. I tried oxy-acetylene, oxy-hydrogen, oxy-butane and oxy-propane and found that oxy-propane gave good results without charring the flux or unduly oxidising the stainless steel. I was working on very small items. John |
Brazing stainless steel - what's easiest?
On Fri, 4 Oct 2019 14:43:14 +0100, David wrote:
"Chris Green" wrote in message ... I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? The stainless is probably one or two mm thick and the joint needs to be reasonably strong as it's holding chimney cowl to a chimney. --------------------------------------------------------------------------------- Silver Solder - Easyflo is you still have some or the non-cadmium equivalent such as Silverflo 55 Flux - you will need a flux such as Tenacity 5 which will still be active with prolonged heating. At work I used oxy-propane for silver soldering and brazing. The fitters couldn't dp st. st. (it was an electronics factory - not much use for such tings). I tried some sort of 'ordinary' flux (ICR which - 30 years...) and of course it didn't work. Tried cleaning the pieces, applying a paste of the flux, leaving for about an hour and it worked! I never did tell them how I did it, so had to do all the odd bits that came along. I made a cage for a a 1.5 li bottle for my touring bike; it's still intact after tens of thousands of miles use. The frame did have 3 bosses on it - wouldn't have loaded 2 bosses like that, especially on 531. -- Peter. The gods will stay away whilst religions hold sway |
Brazing stainless steel - what's easiest?
On 04/10/2019 16:01:51, Chris Green wrote:
Cursitor Doom wrote: On Fri, 04 Oct 2019 13:31:24 +0100, Chris Green wrote: I need to mend a small piece of stainless steel, it's essentially a small length of tube (125mm dia or so) with a flange that needs to be re-affixed to a then plate. The original welds (not mine!) were absolute rubbish and have come apart. I don't have TIG (only MIG and stick) so I think brazing is probably the best option. I have a gas torch which can get it hot enough, so what's the best sort of brazing material to use? Are you sure you can get it hot enough? What gas will you be using? Butane (I think), the slightly hotter of Propane and Butane anyway. However I'm moving towards Gasless MIG, I didn't realise you can get gasless stainless steel MIG wire. Propane flame temperature is 10C hotter than butane (in air). |
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