Introduction

This project grew out of the desire to melt small amounts of metal in a clean, oxygen free environment. I began to experiment with the melting of scrap to make an ingot by using  a standard TIG welding torch and a graphite mold. The experiment had mixed results; some of the ingots  were quite good but there was a lot more gas porosity and oxidation than I had expected.  At the time I did not have time to continue exploring so I set it aside. A few years later when I began working with palladium I was frustrated by not being able to reuse the scrap  in the same way I could use other metals in the shop. Again, it seemed like the TIG torch might offer the means to melt the palladium without the oxygen and hydrogen issues one gets from a oxygen/fuel torch. Since a graphite  crucible was not desirable due to palladium taking carbon into solution making it brittle, some research was needed. In reading about arc melting I came across references discussing  the use of  metal electrodes embedded in the bottom of DC arc furnace designs, which became the starting point for the series of experiments I am presenting here.

I hope you will find it interesting.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s