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An investigation has been made into the effect of a high level of heat input during a wide variety of welding operations upon the mechanical properties of 4 specified thick-walled, thermo-mechanically-rolled steels in varying dimensions. Chemical and metallographic analyses were made on the basic steels and the welds themselves, in addition to the usual tests for mechanical properties. The findings confirmed earlier conclusions about the effects of different energy input levels, i.e. that input energies of up to 70 kJ/cm need not adversely affect basic properties but that higher input levels - of, say, 108 kJ/cm - can be disadvantageous. Investigations were also made into the effects brought about by multi-layer welding. Comparison of the "CEGB-R6"-procedure with the overall results of the investigation as a whole showed that by this means it is possible to provide an estimated safety-margin in respect of the welds which were examined. All failure points fell outside the limiting curve for safe component behaviour, confirming the applicability of this concept to welded joins made with higher levels of plate thickness.

Additional information

Authors: DAHL W, Institut fur Eisenhuttenkunde der RWTH (DE);NIEBEN T, Institut fur Eisenhuttenkunde der RWTH (DE)
Bibliographic Reference: EUR 18430 DE (1998) 107pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4648-2
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