If you must have the best color match, you should probably go with deoxidized copper rods. That is the true welding, anything else is really brazing.
The phos-copper rods, like Silflo, are easy to use on copper, no flux needed, nice. But if you grind it, the color is like steel, so I never use them.
Silicon Bronze rods are close to copper color, use with flux.
I tried low-fuming brass, but it came out yellow.
I have a photo showing the various materials on a test coupon, that I should probably post, but I need to figure out how.
Richard
http://www.fergusonsculpture.com Sculptures in copper and other metals
Copper rods
If you must have the best color match, you should probably go with deoxidized copper rods. That is the true welding, anything else is really brazing.
The phos-copper rods, like Silflo, are easy to use on copper, no flux needed, nice. But if you grind it, the color is like steel, so I never use them.
Silicon Bronze rods are close to copper color, use with flux.
I tried low-fuming brass, but it came out yellow.
I have a photo showing the various materials on a test coupon, that I should probably post, but I need to figure out how.
Richard
http://www.fergusonsculpture.com
Sculptures in copper and other metals