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A Study on Grooving Corrosion at the Weld of a Low Carbon Steel Pipe Made by Electrical Resistance Welding  

Kim Yong (한국항공대학교 항공우주 및 기계공학과 대학원)
Lee Bo-Young (한국항공대학교 항공우주 및 기계공학부)
Publication Information
Journal of Welding and Joining / v.22, no.5, 2004 , pp. 58-64 More about this Journal
Abstract
Although leakage at a low carbon steel pipe made by electrical resistance welding (ERW) was reported due to grooving corrosion, the cause for the corrosion has not yet been cleared. In order to clarify the main cause, failure analysis on the leaked pipe was carried out, followed by metallographic investigation and corrosion test for the various ERW pipe made with different welding heat input. The microstructure, particularly inclusion content, of the weldment is dependant on the welding heat input applied. For an improper low heat input, the amount of inclusion at the weld was high. High inclusion content accelerated grooving corrosion at the weld. It is therefore that welding heat input should be controlled based on the carbon content of the pipe in order to improve the corrosion resistance of the ERW pipe.
Keywords
Grooving corrosion; Electric resistance welding; Metal flow; MnS inclusion; Cold weld; Sulfur content;
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