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Abstract

A joint programme was carried out by Corus, TKS, IEHK and CSM to establish laser-welding procedures for higher strength and thicker plates than those currently welded. The work demonstrated that welds in plates of 8 and 15 mm thickness could be made with a single pass, whilst those at 25 mm can be made with a two-pass procedure. Trials using filter wires and hybrid welding reduced porosity levels but did not prevent solidification cracking.

It was shown that laser-weld metal properties could be characterised using tensile tests, hardness tests, Charpy impact tests and fracture mechanics tests. Yield strength levels were typically in the 700 to 1 100 MPa range. Weld T(27) was typically in the range - 60 to + 20 degrees Celsius and HAZ T(27) in the range - 60 to o degree Celsius. The correlation between T (0) and T(27) appeared to be in good agreement with existing correlations.

S-N fatigue performance was shown to be better than design lines for arc welds. Fatigue initiation occurred from the expected sites. Fracture initiation in wide-plate tests was sometimes in weld metal and sometimes in the HAZ depending on the relative toughness of the regions and the effect of strength mismatch. It was shown that structural integrity assessment procedures such as BS 7910, Sintap, etc. could be applied to laser welds. Comparisons between Eurocode 3 service temperature predictions and laser-wide plate test results showed that safe predictions were observed when weld T(27) or nominal T(27) of the parent material was used. This suggests that laser weld and HAZ Charpy toughness should be required to meet the nominal toughness of the parent material.

Additional information

Authors: HARRISON P L, Corus UK Ltd, Rotherham (GB);ANDRICH M, Corus UK Ltd, Rotherham (GB);LANGENBERG P, RWTH-IEHK, Aachen (DE);FERSINI M, CSM, Rome (IT);SORRENTINO S, CSM, Rome (IT);WEGMANN H, ThyssenKrupp Stahl, Duisburg (DE)
Bibliographic Reference: EUR 20951 EN (2004), 171 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20951-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-7737-7
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