Weldability of Haynes 188 Cobalt Based Superalloy and AISI 316L Austenitic Stainless Steel

Year 2024, Volume: 27 Issue: 3, 995 - 1004, 25.07.2024

Samet Nohutçu , Ramazan Kaçar , Hayriye Ertek Emre

https://doi.org/10.2339/politeknik.1231345

Abstract

Because of their high temperature and oxidation resistance, similar and dissimilar metal welding is needed in producing gas turbine and rocket engine parts, in which cobalt-based superalloys are also used. The fusion welding methods such as gas tungsten arc welding (TIG), Laser welding (LW), Electron beam welding (EBW), and Plasma arc welding (PAW) are widely used for dissimilar metals welding applications. Weld discontinuity such as solidification cracks and liquefaction cracks can occur in the weldment. One way to overcome these problems is to use a low heat input in the welding process. Force TIG welding machine, which has been developed in recent years, allows automatic welding with its integrated systems. Thus, it provides the opportunity to obtain the heat input homogeneously and to perform autogenous welding with its control of the welding parameters. The study aims to investigate the weldability of the Haynes 188 – AISI 316L couple, as supplied, automatically with the Force TIG welding machine, without opening the weld groove, and without using any filler metal (autogenously). For this purpose, the strength and hardness of the dissimilar welded sample were determined, and its microstructure was evaluated in detail.

Keywords

Haynes 188, AISI 316L, weldability, microstructure and mechanical properties

Supporting Institution

Karabük Üniversitesi

Project Number

KBÜBAP-22-DR-081

Thanks

Thanks to Mr. Kadir BEYENAL, owner of 2K welding company, for supporting welding equipment in obtaining the welded joint. This work was supported by the Scientific Research Projects Coordination Unit of Karabük University under the project code number KBU-BAP-22-DR-081. The authors are grateful for their financial support.

Haynes 188 Kobalt Esaslı Süperalaşım ile AISI 316L Ostenitik Paslanmaz Çeliğin Kaynak Edilebilirliği

Abstract

Kobalt esaslı süper esaslı süperalaşımların da kullanıldığı gaz türbini ve roket motor parçalarının üretiminde, yüksek sıcaklık ve oksidasyon dirençleri nedeniyle benzer ve benzer olmayan metallerin kaynağına ihtiyaç duyulmaktadır. Gaz tungsten ark kaynağı (TIG), Lazer kaynağı (LW), Elektron ışını kaynağı (EBW) ve Plazma ark kaynağı (PAW) gibi ergitme kaynak işlemleri, benzer olmayan metallerin kaynak uygulamaları için yaygın olarak kullanılmaktadır. Kaynaklı birleştirmelerde katılaşma ve sıvılaşma çatlakları gibi kaynak kusurları oluşabilir. Bu sorunların üstesinden gelmenin bir yolu, kaynak işleminde düşük ısı girdisi kullanmaktır. Son yıllarda geliştirilen Force TIG kaynak makinası entegre edildiği sistemler ile otomatik kaynak yapmaya imkân vermektedir. Böylece ısı girdisini homojen olarak elde etme ve kaynak parametreleri üzerindeki kontrolü ile otojen kaynak yapma olanağı sağlar. Çalışmada; Haynes 188-AISI 316L çiftinin tedarik edildiği şekliyle Force TIG kaynak makinesi ile otomatik olarak, kaynak ağzı açılmadan ve herhangi bir ilave metal kullanılmadan (otojen olarak) kaynaklanabilirliğinin araştırılması amaçlanmıştır. Bu amaçla, farklı cins malzeme kaynaklı numunenin dayanımı, sertliği belirlenmiş ve mikroyapısı detaylı olarak değerlendirilmiştir.

Keywords

Haynes 188, AISI 316L, kaynak edilebilirlik, mikroyapı ve mekanik özellikler

Project Number

KBÜBAP-22-DR-081

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