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This paper describes the outcome of a research project, which studied the low temperature fracture behaviour of a 35-mm thick welded duplex stainless steel. The main objective of the project was to generate realistic toughness requirements for duplex stainless steel welds designed for low temperatures. It was furthermore aimed to optimise the general welding conditions for shielded metal arc (SMAW) and gas tungsten arc welding (GTAW) of these steels.

The duplex stainless steel base metal has adequate notch toughness and weld capability. The strength of the SMAW welded plates was also adequate but the toughness was fairly low. Wide plate tensile tests performed at - 40° C have demonstrated the structural integrity of these welds at this low temperature for thick, highly stressed components provided these are thoroughly inspected by NDT.

The strength and toughness of the GTAW welded panels were excellent yielding superb results during notch impact and fracture toughness testing. This data was confirmed by wide plate tests, which allowed the conclusion that very large defects may be tolerated in this type of welding. Application of engineering critical assessments has shown that proper conclusions may be drawn from CTOD fracture toughness testing if these methods are not used for high stress levels.

The major benefit of the project was that reasonable minimum toughness requirements could finally be forwarded for duplex stainless steel butt joints for sub-zero temperature applications of primary structures.ures.

Additional information

Authors: PETTERSON C O, Sandvik Steel AB, Sandviken (SE);HOLMBERG B, Avesta Welding AB, Avesta (SE);DELEU E, Belgian Welding Institute, Gent (BE);DHOOGE A, Belgian Welding Institute, Gent (BE)
Bibliographic Reference: EUR 19973 EN (2001), pp. 86. Euro: 13.00
Availability: Available from EUR-OP sales agent URL:
ISBN: ISBN 92-894-1566-5
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