| Title |
Experimental Investigation on the Weld Metal Fracture Strength of Dissimilar Welded Connection of Carbon Steel and Austenitic Stainless Steel |
| Authors |
강현식(Kang, Hyun Sik) ; 김태수(Kim, Tae Soo) |
| DOI |
https://doi.org/10.5659/JAIK.2021.37.5.153 |
| Keywords |
Carbon steel; Austenitic stainless steel; Dissimilar steel weld; Weld length; Weld direction; Weld metal fracture; Design specification |
| Abstract |
Since STS316L among austenitic stainless steels types contains the less carbon compared to STS316 and exhibits excellent intergranular corrosion
resistance and plasticity, it has been used under the welded condition without heat treatment after field welding and seismic performance
requirement. This paper investigated the ultimate strength and weld metal fracture mechanism of carbon steel (SM355) and austenitic stainless
steel (STS316L) fillet-welded connections with TIG (tungsten inert gas) welding through test results. Main variables of specimens are weld length
and welding direction against loading. Fracture shapes of specimens were classified into three modes ; tensile fracture, shear fracture and block
shear fracture in weld metal except for specimens with the base metal tensile fracture. Material tensile strength of weld metal satisfied the
minimum limitation of austenitic stainless steel weld rod (Y316L) in Korean Industrial Standards(KS). Ultimate strengths were compared according
to the welding direction and weld length. C2A2TFW series with transverse fillet weld had the highest strength compared with other types
(C2A2LFW series with longitudinal fillet weld and C2A2FW series with all round weld) based on identical weld length. It is known that current
design specifications such as KDS, AISC, ASCE and AISI underestimated the strength of specimens. |