On the Type of Distortion in Various Welded Joints

Shrinkage distortion in welded joint (Report 5)

Abstract

In welded joints three types of distortion as shown in Fig. 1 are observed. Distortions of bead-on plate (thickness 3.2-19mm) are given in Table 1. Distortion of thick plate over about 10mm becomes concave-concave type, and for the thin plate less than about 6mm it becomes convex-concave type. Distortion of free butt-welded joint is generally concave-convex type as shown in Fig. 5 (No. 1 specimen) and Table 2. These characteristics can be explained by our theory of shrinkge distortion in welded joint. (see Fig. 3)
If transverse distortion in butt-joint is constrained, longitudinal distortion of mother plate apart from the weld line becomes convex. (see Table 2) Similar characteristics are observed in tee-fillet joint. (see Table 3) This is considered to be due to non-uniform distribution of transverse angular change.
In the very thin plate, distorrtion seems to be produced by buckling as shown in Fig.10.The distortion in this case is concave-convex or convex-concave type.(see Fig.9)