Characteristics of Out-of-Plane Deformation and Residual Stress Generated by Fillet Welding

摘要

Longitudinal bending deformation was largely influenced by the welding sequence. Its magnitude was the smallest in the case when welding was continuously performed from one side to the other side. It was not so greatly influenced by changing of the welding speed in actual operation or the welding heat input. Angular distortion was largely influenced by the welding sequence, changing of the welding speed or the welding heat input. When welding was continuously performed as above mentioned, its magnitude was the smallest. But, it was different for left and right sides. If the welding speed becomes fast, angular distortion tends to be large and to converge to a certain limit. Attention should be paid to angular distortion which was found to be large when it was estimated ignoring effect of the moving heat source. Angular distortion tended to be large until the relative heat input for the flange thickness reached a certain value. Then, when the welding heat input exceeded this certain value, it conversely became small. Generated residual stress σ_x (component of weld line direction) was largely influenced by the welding sequence. Residual stress, σ_x, became large when the welding speed became fast or the welding heat input became large.