A 3-D finite difference model simulating single pass autogenous welds was used to predict the temperature fields in HY-80 steel arc weldments at various powers and torch velocities. From the predicted temperature field, two important solidification parameters were calculated at the solid-liquid interface: temperature gradients and crystal growth velocities. These were correlated with the macrostructures observed in actual weldments. For purposes of model validation, the predicted and actual fusion zone sizes were in agreement, as were the predicted time temperature curves compared to those measured with thermocouples embedded in the plate.

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http://archive.org/details/acorrelationofwe1094523596

Lieutenant, United States Navy