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http://dx.doi.org/10.5781/KWJS.2009.27.5.049

A Study on Characteristic of Fracture in Lap Joint Welded STS429L  

Choi, Dong-Soon (Graduate School, Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
Kim, Jae-Seong (Graduate School, Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
Kim, Hyun-Jae (Graduate School, Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
Lee, Bo-Young (Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
Publication Information
Journal of Welding and Joining / v.27, no.5, 2009 , pp. 49-54 More about this Journal
Abstract
Recently, a demand of ferritic STS is increasing rapidly in automobile exhaust system. Exhaust manifolds are the part nearest to the engine so that the material is exposed to high temperature exhaust gas. Excellent heat resistant properties, especially high temperature strength, thermal fatigue resistance and high corrosion resistance are necessary for these parts. STS429L contains 15 weight percent of Cr and low Mo, so has good price competitive. And it has excellent high temperature strength and corrosion resistance, so receives attentions as material that applying to exhaust manifold. In tensile test of lap joint welded STS 429L, most of specimens are failed in base metal, but occurs brittle fracture in weld metals at some specimens in the face of good welding conditions. In the process of tensile test, lap joint welded STS429L specimens are transformed locally. The brittle fracture occurs that local transforming area exists in weld metals. But, butt welding specimens made by same materials showed ductile fracture in tensile test and bending test. In this study, suppose the reason of brittle fracture is in the combined local transform and tensile stress, through analysis of bead geometry, evaluate geometrical factor of brittle fracture in lap joint welded STS429L.
Keywords
STS429L; Lap joint; Exhaust manifold; Automobile industry; Ferritic stainless steel; Bead geometry; Brittle fracture;
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