Yugi or bangjja is traditional hand forged Korean bronzeware.

So for all the folks that have been looking for a hot forgable bronze or food safe bronze this is the ratio.

78% copper 22% tin.

The alloy has a golden sheen and is self sanitizing.

Thanks Greg. Is there an alloying / melt procedure for best results?

Frosty The Lucky.

Your welcome Frank.

Just kidding Jerry.

Sorry no Gregs here.

Same produces as the last time we talked about alloying copper and tin.

Don't over work the material. If it gets to cold while working it will tear/crack.

Sorry Larry, It must be my week to get posts and people scrambled in my mind. 

I was referring to making the alloy itself, not working it. Do you melt the copper then add the tin or do you melt both at the same time . . . Or? 

Frosty The Lucky.

Swing and a miss. Strike two. It's  just FM. 

Just weight out the copper and tin in the proper ratio and throw it in a crucible and bring to temp.

It doesn't really matter the order of the metals, the tin will end up at the bottom before your furnace can even heat up.

Tin melts at 450°F

Copper 1984°F

That doesn't matter. You don't get tin loss Until you hit a temperature of 4716°F. Unless you have it under  vacuum pressure then you get loss at a lower temp, but im talking atmospheres worth of pressure.

So, if anyone can get their furnace that hot ¹more power to them. I can't.

 

Sorry, no name games.

Sounds good, 78% 22% Bronze is easy, toss it in the crucible and bring it to melting temp. Anything after that, is it ready to pour?

Frosty The Lucky.

 

 

Keep an eye on it. I try and pouring it as soon as the copper is molten. The longer it is molten the more oxygen is absorbed. If molten to long you will have problem with porosity.

Once I see the copper melt I give it a quick stir with a graphite rod and pour.

If you want you could add some charcoal on top to help. I haven't had to do this, but I use this method every time I melt sterling silver.

Okay, I like straight forward. Get the molds, etc. ready before the copper starts to melt. Quick stir with graphite rod to deoxidize(?) the mix and pour. No rod, cover in charcoal.

Thanks for your patience.

Frosty The Lucky.

Yes. If you wanna get technical. The main purpose for me is to feel for any solid pieces of metal.

That's like aluminum, as soon as it's melted it's ready to pour. The intuitive mistake we all made in middle and high school was thinking hotter made better details. When we got it right we'd find finger prints left in the sand, on the castings. It turned into a game to sign our castings with our thumbprint under the base.

Thanks, the conversation is bringing back memories of metal shop class and Mr. Harding. Good times.

Frosty The Lucky.