The Shop > Metal Stuff
Silver soldering question
Bluechip:
Hi Benchmark
Some info here, see topics, down left hand side
http://www.cupalloys.co.uk/
Dave BC
HS93:
Hopw big is the Boiler , it sounds like you are taking to long getting it hot with to small a flame, I would only use that torch on a mamod sized boiler and then I would proberley want a bit more heat to get it flowing.
peter
andyf:
Hi Benchmark,
I tried silver soldering some steel items with a butane/propane torch like yours. I had to put my items on the gas kitchen stove and heat them with that from below and with the torch from above top to get things hot enough. So I took advice: http://madmodder.net/index.php?topic=3904.0 and now have one of the propane sets which John Bogstandard recommended. This works much better, and the trigger on the side of the torch is very convenient - releasing it drops the flame to a pilot light.
Andy
benchmark:
Thanks for the responses guys,
--- Quote from: Bernd on January 17, 2011, 07:59:29 AM ---Sounds like you aiming the flame right at the flux. Try heating the metal around the flux to a dull red. The flux should start to turn on you and get clear. Apply silver solder and remove heat. Try that on a couple of prcatice pieces. Remember heat the metal not the flux. Let the metal heat the flux.
Hope this helped some.
Bernd
--- End quote ---
I did exactly that and when it didnt work i tried with the flame directly on the flux, that didnt work either :bang:
--- Quote from: sorveltaja on January 17, 2011, 07:59:29 AM ---it sounds like you have used wrong kind of flux, despite the product's description.
What you described about that flux, how it gets brown and burns away, reminds me of soft soldering flux.
--- End quote ---
i thought of that too and have now ordered new flux and silver solder rods in a kit from Germany this time but i would have assumed that the one i bought from the UK should have been good stuff since it too came as a kit and from a renown model engineering shop who had it on sale on ebay.
--- Quote from: Bluechip on January 17, 2011, 07:59:29 AM ---
Some info here, see topics, down left hand side
http://www.cupalloys.co.uk/
--- End quote ---
Thanks, i will read that too .
--- Quote from: HS93 on January 17, 2011, 07:59:29 AM ---Hopw big is the Boiler , it sounds like you are taking to long getting it hot with to small a flame, I would only use that torch on a mamod sized boiler and then I would proberley want a bit more heat to get it flowing.
--- End quote ---
The boiler is a Tubal cain size, much smaller than a mamod TE boiler.
--- Quote from: andyf on January 17, 2011, 07:59:29 AM ---I tried silver soldering some steel items with a butane/propane torch like yours. I had to put my items on the gas kitchen stove and heat them with that from below and with the torch from above top to get things hot enough. So I took advice: http://madmodder.net/index.php?topic=3904.0 and now have one of the propane sets which John Bogstandard recommended. This works much better, and the trigger on the side of the torch is very convenient - releasing it drops the flame to a pilot light.
--- End quote ---
i may just buy myself a new torch like the pictures above but just for fun i tried heating the silver solder directly and it melts so this should be a sign that my torch it hot enough, correct?
Jasonb:
If you have been supplied the easyflow flux shown in the e-bay page then its the right flux. Did you mix the powder with water? it needs making into a stiff past and applying to a well cleaned surface.
Its more than likely the blow lamp you have is not getting the heat into the matal fast enough and you are eventually exhausting the flux. You really want a separate propane cylinder of at least 3.9kg size with a torch that has a 25mm burner, something like this
The stick of solder will melt long before the work reaches a suitable temp for the solder to actually flow, try heating in a room that is not too brightly lit, the work should be glowing dark red, if its not you are not getting it hot enough
Jason
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