|About this Abstract
|10th International Symposium on Superalloy 718 and Derivatives (2023)
|Superalloy 718 and Derivatives
|Keyhole TIG Welding of New Co-lean Nickel-based Superalloy G27
|Achmad Ariaseta, Dario Pick, Joel Andersson, Olanrewaju Ojo
|On-Site Speaker (Planned)
The hot sections of aircraft engines have been preferably fabricated by joining small pieces of superalloys by the welding process instead of casting a single large component due to several benefits, such as reducing the total weight of the components and enhancing the design flexibility. The welding process and the associated control themselves, to some extent, have enhanced remarkably in the last decades. One of the recent welding techniques is Keyhole TIG (K-TIG) welding which has the capability to use lower heat input and higher energy density to achieve deeper penetration during the welding compared to the traditional one, being essential when joining superalloys in the hot sections of an aircraft engine in the aerospace industry. Alloy G27, a new Co-lean nickel-based superalloy with service temperature capability up to about 760 °C, is a promising material candidate to be utilized in the fabrication of aero-engine hot sections. From the industrial perspective, it is of paramount importance to produce a superalloy weld that meets the tight quality criteria in aerospace applications in terms of weld geometry and weld defects. Moreover, understanding the microstructures in the heat-affected zone (HAZ) and fusion zone (FZ) is essential since they influence the properties and integrity of the weldment and will become the basis for developing suitable post-weld heat treatment. Thus, this article aims to study the effect of K-TIG welding parameters on weld geometry and weld defects of G27 and to characterize the microstructures in HAZ and FZ of the welded alloy.
|Definite: At-meeting proceedings