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Fabrication and welding of structural superalloy components for aero-engines, land-based gas turbines as well as for the energy sector (i.e., steam boilers) continues to be of high importance to the manufacturing industry. The components, which utilize superalloys, are usually referred to as the most demanding, and where the welding of these most often plays an essential role, not only in manufacturing, but also in repair and re-manufacturing. It is therefore of utmost importance that the welds used in the design are of suitable quality to account for the demanding environment. Numerous challenges exist in welding these alloys and caution needs to be exercised in order to avoid problems such as hot cracking or strain age cracking. In addition, there is a wide range of weldability testing methods available to predict, for example, susceptibility toward hot cracking, where each method has its unique characteristics. Nevertheless, the available weldability testing methods play a vital role in the fundamental study of the root cause for weld cracking, which can be further enhanced by characterization as well as simulation. This Special Issue provides insight into new findings, communicating views about the accomplishments, and future directions in superalloy welding and weldability testing research.

Welding Metallurgy and Weldability of Superalloys