Haynes Hastelloy C-22/622 description: HASTELLOY C-22 RTW filler metal is used for the gas tungsten arc and gas metal arc welding of HASTELLOY C-22 deposited weld metal has low thermal expansion characteristics, good oxidation resistance to 1500F (815C) and excellent fabricability. The alloy is used in gas turbine seal rings, containment structures and high-strength fasteners. The RTW finish on the spooled wire promotes smooth feeding through welding equipment and reduced tip wear in contact tip.