Investigation of the microstructure-mechanical properties of the Haynes 188 cobalt-based superalloy couple welded with a force TIG welding machine

Samet Nohutçu; Ramazan Kaçar

doi:10.3989/revmetalm.e269.2305

Authors

Samet Nohutçu Karabük University, Manufacturing Engineering Department https://orcid.org/0000-0002-2600-3993
Ramazan Kaçar Karabük University, Manufacturing Engineering Department https://orcid.org/0000-0002-3903-1838

DOI:

https://doi.org/10.3989/revmetalm.e269.2305

Keywords:

Autogenous welding, Haynes 188 superalloy, Force TIG welding machine, Mechanical properties, Microstructure

Abstract

Haynes 188 cobalt-based superalloy, widely used due to its high temperature corrosion and oxidation resistance, is also used in the hot part of gas turbine engines. The joining of these alloys is very important, and generally, TIG (Tungsten Inert Gas) welding method is used. Recently, the Force TIG welding machine has been developed to join thick-section metals without weld groove. It can also be used for autogenous (without filler metal) welding of superalloys. For the first time this study was aimed to investigate the microstructure, mechanical properties, and the autogenous weldability of cobalt-based Haynes 188 superalloy with a Force TIG welding machine. For this purpose, the mechanical properties of the autogenously welded sample were determined, and its microstructure was evaluated in detail. Conclusively, the weldment strength was found within acceptable ranges, but the ductility was determined to be less than the acceptance criteria.

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