Haynes 242 description: HAYNES 242 RTW filler metal is used for the gas tungsten arc and gas metal arc welding of HAYNES 242 alloy. The 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 tips.