The Effects of TIG Welding Rod Compositions on Phase Distributions and Corrosion Properties of Dissimilar 304L and 420 Stainless Steel Welds

Year 2020, Volume: 12 Issue: 1, 134 - 147, 31.01.2020

Mustafa Gökhan Murat , Aziz Barış Başyiğit

https://doi.org/10.29137/umagd.616829

Abstract

304L austenitic and 420 martensitic stainless
steels are demanded in wide range of industries. 304L alloy exhibits good
resistance to oxidizing medias up to 760°C and they also maintain superior
impact properties at cryogenic temperatures while 420 alloy provides the
strength values close to tool steels in with satisfactory corrosion properties
in ambient atmospheres. 

In this work; 420 plate is TIG (Tungsten Inert
Gas) welded with 304L plate with both thicknesses of 3 mm. Welding operation is
applied by two passes under pure argon gas also with shielding the weld root. 3
types of TIG welding rods; ER312, ER316L and ER2209 are used in TIG welding for
ensuring 3 different weld metal compositions. The effects of TIG welding rod
type on weld metal phase ratios with microstructural and corrosion properties
are investigated. Microstructural inspections and corrosion (weight loss) tests
are applied to all joints after welding operations. 

The sample joined by ER312 TIG rod transformed the weld metal into
dendritic microstructure and the sample joined by ER2209 TIG rod resulted in
globular type of weld metal microstructure. The specimen that welded by ER316L
type TIG welding rod resulted in the best corrosion test values among all
welded samples.

Keywords

420 and 304L stainless steels, TIG welding, phase analysis, corrosion of stainless steels

Thanks

The authors express their thanks to Gazi University and Kırıkkale University, Metallurgical and Materials Engineering Departments Laboratories for their precious supports about testing instruments.

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