Open AccessEffect of Shielding Gas and Filler Metal to Microstructure of Dissimilar Welded Joint Between Austenitic Stainless Steel and Low Carbon Steel
Author(s) -
Dewin Purnama,
Herry Oktadinata
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/547/1/012003
Subject(s) - materials science , welding , shielding gas , metallurgy , microstructure , austenite , carbon steel , scanning electron microscope , composite material , heat affected zone , electromagnetic shielding , filler metal , gas tungsten arc welding , optical microscope , austenitic stainless steel , non metallic inclusions , arc welding , corrosion
Welding of dissimilar metals involves different types of metals which have different chemical composition, mechanical and thermal properties. This paper presents a study on dissimilar metal weld between type 304 stainless steel and SS400 carbon steel. The steel plates were welded by using different filler metals (solid wire, flux-cored wire) and different shielding gases (100%CO 2 , 90%Ar+10%CO 2 ). Then the weldments were observed by optical microscope, scanning electron microscope and EDX analysis. It seems that the weldments which were welded by using 100%CO 2 shielding gas have significant amount of inclusions in weld metal compared to 90%Ar+10%CO 2 shielding gas mixture. The EDX analysis shown the inclusions are oxides which consist of some elements (C, Si, Cr, Mn) with O. The weldment which was welded by using 90%Ar+10%CO 2 shielding gas mixture and solid wire has much less inclusions in weld metal.