Author: Gubeljak, Nenad

Source: Science and Technology of Welding & Joining, Volume 10, Number 2, April 2005 , pp. 252-258(7)

Publisher: Maney Publishing

Abstract:

The use of high strength low alloy steels for high performance structures (e.g. pressure vessels and pipelines) requires high strength consumables to produce an overmatched welded joint. This globally overmatched multipass welded joint contains two significantly different microstructures, as-welded and reheated. In this paper, the influence of weld metal microstructure on fracture behaviour is estimated in comparison with the fracture behaviour of composite microstructures (as-welded and reheated). The lower bound of fracture toughness for different microstructures was evaluated by using the modified Weibull distribution. The results, obtained using specimens with crack front through the thickness, indicated low fracture toughness, caused by strength mismatching interaction along the crack front. In the case of through thickness specimens, at least one local brittle microstructure is incorporated in the process zone at the vicinity of the crack tip. Hence, unstable fracture occurred with small, or without, stable crack propagation. Despite the fact that the differences between the impact toughness of a weld metal and the that of base metal are insignificant, the fracture toughness of a weld metal can be significantly lower.

Keywords: RESISTANCE CURVES; CRACK TIP OPENING DISPLACEMENT; HIGH STRENGTH STEEL WELD; MISMATCH EFFECTS; FRACTURE MECHANICS OF WELDED JOINTS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329305X39284

Publication date: 2005-04-01

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