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Welding of High Strength Toughened Structural Steel S960QL

Madej K., Jachym R.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2017

Vol. 61, No. 2

6--16

The article discusses the effect of the thermal conditions applied during the MAG welding of steel S960QL and the mutual annealing of runs on the mechanical properties as well as on the macro and microstructure of welded joints made using various values of cooling time t8/5. The research described in the article also involved the comparison of the above-named results with those obtained during a thermal simulation. In addition, the article presents the test results concerning the examination of the coarse and fine-grained areas of the HAZ of welded joints. The test results made it possible to optimise the value of cooling time t8/5 when welding steel S960QL.

Omówiono wpływ warunków cieplnych spawania stali S960QL metodą MAG oraz wzajemnego wyżarzania ściegów na własności mechaniczne oraz makro- i mikrostrukturę złączy spawanych, wykonanych z zastosowaniem różnych czasów chłodzenia t8/5, a następnie porównano te wyniki z rezultatami prób symulacji cieplnej. Przedstawiono również wyniki badań obszaru grubo- i drobnoziarnistego strefy wpływu ciepła złączy spawanych. Wyniki badań umożliwiają optymalizację czasu chłodzenia t8/5 spawania stali S960QL.

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.