Influence of welding passes on grain orientation – The example of a multi-pass V-weld

The accurate modelling of grain orientations in a weld is important, when accurate ultrasonic test predictions of a welded assembly are needed. To achieve this objective, Electricité de France (EDF) and the Laboratoire de Caractérisation Non Destructive (LCND) have developed a dedicated code, which makes use of information recorded in the welding procedure. Among the welding parameters recorded, although the order in which the welding passes are made is of primary importance in the welding process, this information is not always well known or accurately described. In the present paper we analyse in greater detail the influence of the order of welding passes, using data obtained from the Centre for Advanced Non Destructive Evaluation (CANDE), derived from a dissimilar metal weld (DMW) with buttering. Comparisons are made using grain orientation measurements on a macrograph.

► Influence of welding process on grain structure is studied using the MINA model.
► For the first time the importance of a slight slope of the layers is evaluated.
► Two orders of passes are compared for the modelling approach.
► A major effect is observed due to a change in the order of passes.