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Title |
Experimental Study on Strength of Austentic Stainless Steel (STS 304L) Fillet-Welded Connection with Weld Metal Fracture According to Welding Direction
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Authors |
김태수(Tae Soo Kim) ; 이후창(Hoochang Lee) ; 황보경(Bokyung Hwang) ; 조태준(Taejun Cho) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.081 |
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Keywords |
오스트나이트계 스테인리스강(STS304L) ; 용접길이 ; 용접방향 ; 용착금속파단 ; 설계기준 Austenitic stainless steel(STS304L) ; Weld length ; Welding direction ; Weld metal fracture ; Design specification |
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Abstract |
Austenitic stainless steels have excellent corrosion resistance, durability and fire resistance. Especially, since STS304L among austenitic types is a low-carbon variation of STS304 and has excellent intergranular corrosion resistance, it can often be used under the welded condition without heat treatment after field welding. This paper investigated ultimate behaviors such as ultimate strength and weld metal fracture mechanism of STS304L 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 of specimens are classified into three modes(tensile fracture, shear fracture and block shear fracture). Ultimate strengths were compared according to the welding direction and weld length and TFW series with transverse fillet weld had the highest strength compared with other types(LFW series with longitudinal fillet weld and FW series with all round weld). It is known that current design specifications such as KBC 2016 and AISC2010 underestimated the strength of TFW and LFW specimens and provided unconservative estimates for FW specimens. Finally, strength equations were proposed considering material properties of STS 304L material.
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