Technically you can either braze or solder though you cannot braze with solder or solder with brazing rods.
Braze steel to copper.
All i had on that day was a cutting torch but it allowed for a soft enough flame to get the job done.
The melting point of copper cu alloy uns c12200 is 1 981 f 1082 c.
Copper phosphorous brazing welding rods.
Updated april 24 2017.
For larger production series one may prefer less expensive consumables like copper base filler metals.
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.
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.
As such the filler metals for soldering and brazing copper and copper alloy tube and fittings must have melting temperatures below this temperature.
You can purchase brazing rods with varying of silver content and either flux coated or un coated rod.
The joint will only be as strong as the silver solder itself.
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You can silver solder stainless to itself or to brass or copper to make easier connections without risk of corrosion problems.
But you can attach copper to steel with silver solder using a propane torch and call it whatever you like.
Thats a good indication that brazing material flowed where it was needed.
Use a torch that produces a high intensity flame.
Clean and flux the area to be silver brazed.
How to braze stainless steel to copper.
11 18 2004 03 16 am 2.
The basic difference between soldering and brazing is the temperature necessary to melt the filler metal.
I use oxi acetylene torch and use silfox solder.
How to braze copper to steel with silver solder.
Use the right brazing rod material for the metal used in your project.
But will also cost more and requires the use of an acetylene or mapp gas torch to melt the brazing rod.
The higher the silver content the stronger the bond but the hotter the temperature needed to melt the filler metal.
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.
Brazing copper will provide a stronger bond because of the high of silver in the brazing rod.