Fundamental Researches on Bead Formation in Overlaying and Fillet Welding Process (2nd Report)

Surface Tensional Analysis of Surface Profile of Horizontal Fillet Weld

Abstract

In conventional processes such as overlay and horizontal fillet welding, an important problem to be solved is associated with the bead shape. As easily seen at the hunging bead in horizontal fillet welding, the most dominant factor to be considered is the influence of gravity on the molten pool. Therefore, the purpose of this investigation is to make clear the effect of gravity on bead shapes.
In the previous paper, we discussed surface profiles of bead on plate on the basis of surface tensional analysis of two dimensional molten pool and obtained satisfactory results.
As for the bead surface profile, a more important problem is associated with the horizontal fillet welding process. Hence in this paper, surface profiles of horizontal fillet welds are discussed as follows; Firstly, the theoretical surface profile of two dimensional molten pool is treated when the non-dimensional leglengths and the cross sectional area of deposit are given. Secondly, such a calculated surface profile of the two dimensional molten pool is compared with the bead shape in a non shielded arc welding and, consequently, we have obtained good correspondence between the model analysis and the experiment.
In conclusion, the two dimensional analysis used in this work is quite available to predict the bead shape in an arc welding where the digging action by arc force is relatively small.