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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Microstructure and corrosion resistance of the duplex steel wide-gap one-side fluxcored wire welded joints

Nowacki J., Zając P.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 28, nr 2

191-198

Purpose: this paper was to determine the impact of the wide-gap welding, with increased root face gap, on structure and corrosion properties of the welded joints executed on duplex steel by one-side welding on ceramic backings. Design/methodology/approach: In the described work, experiments were conducted to welding tests for selected joints, visual examinations, non-destructive testing of welded joints, X-ray examinations, and metallographic testing of welded joints. Findings: As a result of the performed inspection, decreasing of the ferrite content with the increase of the root face gap (increase of welding heat input) was observed. The minimum measured ferrite content was not lower than 28%, and the maximum value did not exceed 69% (the permissible range being from 25 to 70%). Research limitations/implications: Further studies on the impact of the wide-gap welding, with increased root face gap, on structure and corrosion properties of the welded joints are required. Practical implications: The performed tests and examinations of welded joints with root face gap ranging from 6 to 10 mm were intended for extending the standard range from 2 to 6 mm. Originality/value: The experimental program verified the testing methodology, and techniques of welding of the duplex steel with the wide-gap.