You can purchase brazing rods with varying of silver content and either flux coated or un coated rod.
Braze steel to copper.
Updated april 24 2017.
The melting point of copper cu alloy uns c12200 is 1 981 f 1082 c.
Use a torch that produces a high intensity flame.
Clean and flux the area to be silver brazed.
All i had on that day was a cutting torch but it allowed for a soft enough flame to get the job done.
Copper phosphorous brazing welding rods.
But will also cost more and requires the use of an acetylene or mapp gas torch to melt the brazing rod.
The brazing rod should be melted by the heat of the metal pieces being joined not by direct contact with the flame of the torch.
The joint will only be as strong as the silver solder itself.
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I use oxi acetylene torch and use silfox solder.
But you can attach copper to steel with silver solder using a propane torch and call it whatever you like.
Trying to brazing a steel to copper connection do i have to use a kind of flux or is correct do it as a copper to copper.
Technically you can either braze or solder though you cannot braze with solder or solder with brazing rods.
Generally welding holds stainless steel parts together best.
You can silver solder stainless to itself or to brass or copper to make easier connections without risk of corrosion problems.
For larger production series one may prefer less expensive consumables like copper base filler metals.
The only drawback can be the relatively high cost of silver base filler metal but that may be offset by the low cost of equipment.
The basic difference between soldering and brazing is the temperature necessary to melt the filler metal.
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Brazing copper will provide a stronger bond because of the high of silver in the brazing rod.
Here are basic tips for silver brazing copper to steel or stainless steel.
As such the filler metals for soldering and brazing copper and copper alloy tube and fittings must have melting temperatures below this temperature.
Thats a good indication that brazing material flowed where it was needed.
How to braze copper to steel with silver solder.
Recommended rods by metal type.