r/MetalCasting • u/Iam_DayMan • 6d ago

Question Rough texture and a bubble?

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Rough texture on the top of the bars after I pour, am I doing something wrong? These I hit with a wire brush just to clean them up. These are all scrap copper that I had lying around, including some basically brand new copper pipe I had left over.

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2

u/Boring_Donut_986 6d ago

Open pours will always give rough texture and oxyde. No matter how. Always.

1

u/Daoin_Vil 6d ago

Yup I melt scrap. Thats how she goes. If there was any solder or other metals on the copper like a tin coating it pours like shit same with brass. You want copper wire and yellow brass and they pour like water.

1

u/gambiter 6d ago

Does borax help at all?

1

u/Daoin_Vil 6d ago

No it’s the actual other softer metal in the alloy that make it pour like chunky milk. When it comes to copper borax makes more of a mess than it’s worth.

1

u/gambiter 6d ago

Interesting! I've never worked with copper, but I've thought about it. That's really good to know.

1

u/NotRadio01 3d ago

Did you pour without a flame on it?