OK, first off titanium burns. All grades of titanium burn. You can
not tell the alloy by burning it. At 16 volts you would only reach a
purple/gold range. At 30 volts you
would continue up through dark to light blue. It is most likely a
matter of surface prep. Remove the surface of the
titanium completely. Titanium picks up everything it touches. That
includes crap from your tools. Isolate the equipment you use on
titanium from other metals. Cross contamination may have happened
before you bought it. If it is scrap it is bound to have all kinds
junk absorbed into the surface. Scrap is scrap. Often for a reason.
If you want good results buy good material from a reliable source.
Thank you, Bill, Deborah, Michele & Sarah
Reactive Metals Studio, Inc.
800/876-3434 - 928/634-3434 - F928/634-6734