Effect of Heat Input Condition on Reduction of Angular Distortion by Transformation Expansion of Weld Metals

-Welding Distortion Control by Transformation Expansion of Weld Metals (Report 3) -

Abstract

The effect of heat input parameter on residual angular distortion and reduction by transformation expansion of weld metals was investigated by means of numerical simulation. The combinations of heat input Q and plate thickness h were varied to change the heat input parameter Q/h². Consequently, the residual angular distortion could be parameterized by the heat input parameter. On the other hand, the reduction of the angular distortion by the transformation expansion was not parameterized by heat input parameter. A parameter b/h, ratio of penetration depth to plate thickness was proposed to consider the effect of welding condition on the reduction of angular distortion. Reduction of angular distortion was linearly proportional to the ratio of the penetration depth to the plate thickness (b/h).