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In the present work, the possibility of improving the fracture behaviour of welded joints in higher strength structural steel was investigated in terms of varying both heat affected zone (HAZ) toughness and weld metal strength levels. Titanium treated and titanium free steel were used to provide different levels of HAZ toughness and weld metal strength levels were varied by alloying the weld metal with three levels of Mn, Ni and Mo. Butt welds were made at 3.0 kJ mm{-1} using a multipass submerged arc welding (SAW) procedure and the HAZ fracture toughness was assessed using Charpy 'V' crack tip opening displacement (CTOD) and wide plate test specimens. The results have shown that HAZ toughness can be improved by the use of titanium treatment of the steel or by PWHT. The Charpy, CTOD and wide plate tests conduced in the present investigation failed to rank the various weld conditions in the same order and this highlights the practical difficulties in choice of the type and number of HAZ tests to conduct in order to predict full scale behaviour.

Additional information

Authors: HARRISON P, British Steel, Swinden Technology Centre, Rotherham (GB)
Bibliographic Reference: EUR 15842 EN (1996) 150pp., FS, ECU 18.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6971-2
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