Demonstration of Thick Section Welding of Haynes® 282® to Steel

Demonstration of Thick Section Welding of Haynes® 282® to Steel Shankar Srinivasan, Arun Mohan and Jerry Bruck Advanced power plant design requires the use of heat tolerant alloys in critical locations.  Haynes® 282® has become an alloy of popular choice for such applications.  Incorporation of this alloy in components (e.g., rotors) of thick section that are, for cost and performance reasons, also made of high strength low alloy steel (HSLA) was then identified as a welding challenge to be solved. This paper reports demonstration and mechanical testing of such thick section welding of Haynes® alloy 282® to 3.5NiCrMoV alloy steel.  The advanced welding process known as keyhole tungsten inert gas welding (aka K-TIG) and conventional gas tungsten arc welding (GTAW) are reported to be successfully applied to achieve this dissimilar metal welding using Haynes® 282® filler metal in various groove weld geometries of up to 3-inch (76 mm) thickness.  Computational weld modelling to determine weld distortion and assist in down selection of weld geometry is also reported.