Effect of Welding Conditions on the Change of Root Opening During Butt-Welding

Shrinkage Distortion in Welded Joints (Report 4)

Abstract

Change of root opening during butt-welding is effected by welding conditons and by the constraint of joint. Two types of ring specimen as shown in Fig. 1 are used, and the following experiments are done :
Case 1 ...... Specimen α, Weld AC (weld of first pass of free butt-joint)
Case 2 ...... Specimen b, Bead weld AC
Case 3 ...... Specimen α, Weld DB
The change of root opening is meaursed by dial gauge at the point B (see Fig. 1). The results of Case 2 are shown in Figs. 2-5., the results of Case 1 in Figs. 6 and 7 and the results of Case 3 in Fig. 8. Difference in manual weld and submerged arc weld is observed in Case 1.