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In recognition of the more stable structure of bainitic steels after heating when compared with martensitic steels, an investigation was made a) to establish the impact of more economical, i.e. high-speed welding procedures for structural steel components upon the mechanical properties of high-strength bainitic construction steels and b) to determine the influence in that situation of micro-alloying such steels with titanium. Ten specially-prepared batches of steel with varying levels of titanium content were subjected to a wide range of simulated welding conditions including a spread of cooling times (7 - 300s) and a spread of energy input rates (27 - 112 kJ/cm). The notched-bar impact test was used to evaluate the mechanical properties of the steels used. A martensitic steel (Type N-A-XTRA 70) was also tested for comparison purposes. The results indicated that the combination of a more stable bainitic structure and a slower rate of grain-size growth on heating due to the separation of TiN could be expected to permit the introduction of high-speed welding procedures. Energy input rates of up to 50 kJ/cm appear acceptable and pre-heating is not necessary.

Additional information

Authors: FRANKE A, TU bergakademie Freiberg- Institut fur Eisen- und Stahltechnologie (DE)
Bibliographic Reference: EUR 18484 DE (1998) 150pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4418-8
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