Today at my university I melted a zirconium sample that was into a "home made" oven that makes "sparks". I don't remember the name of the type of oven. The mechanism is to put a sample into the oven. Hmm I don't know how to explain the rest in English... Basically you create a continuous (in time) spark and direct it toward the sample. It will melt. It took less than 5 seconds to melt a small sample (a few grams) of zirconium. Of course the light that the sample emits is so bright that you need to wear darkened glasses in order to look at what you're doing. That was really beautiful! If you know the name of such a oven, please let me know. Thank you.