Thanks for the welcome. I have been lurking for a while cause there are some smart folks here. WOW!!!
Thanks you a ton for pointing me to that thread, but it not quite what I am looking for. Let me break down what information I am looking for. The information at the bottom of the page does say what color is and is not acceptable, but to who's code? These welds may be fine for Joe's shop down the street but not for NASA due to each facility specifying what is and is not acceptable for their specific applications. While welding Ti (or really any material for that matter), the weld is going to turn X color depending on the temperature of the weld after it leaves the gas envelope of the trailing shield. Brown may be an acceptable color for Joe's shop but at what temperature, if I am working to a very strict code, does my weld need to be when it leaves the gas envelope in order to meet color criteria, and deemed a good weld? I have spent many o' hour looking for this info for Titanium. It is really easy to find for stainless like in the link below, but Ti,,, a different story!
http://www.bssa.org.uk/topics.php?article=140