Ever tried copper chill plates- and also Tempilsticks-- you want to contain the input temp. to the weld area and in the HAZ (heat affected zone) Assume you are using Thoriated tungstens and DC straight polarity on your TIG set-up-- another way to contain input heat is to use a 50-50 ratio of argon and Helium- expensive however--RWTF

"The field is the touchstone of the man"..