Studies on Deformations and Cracking in One Sided Welding (2nd Report)

Abstract

In the previous paper, the authors showed a method to calculate opening displacements of the groove near the end of plates in one sided automatic welding. Then, they compared the calculated results to the experimental ones. But there were some differences between the calculated displacements and the experimental ones.
In this report, the authors tried some improvements of calculating method aiming to get more, close agreement with experimental data. Based on temperature distributions, which they measured, the opening displacements of the groove are calculated. In this process, the following improvements to the previous method were made :
(1) Yielding effect of sealing bead in front of welding arc was considered.
(2) Inherent shrinkage strains were distributed behind welding arc.
(3) Boundary temperature of elliptic hole representing molten pool and its vicinities was changed to 700°C from 500°C.
(4) Displacements calculation before welding arc reached sealing bead was tried by arranging a slit between arc and sealing bead.
As a result of these analyses, simulations of deformation behavior of weld metal during solidification in one sided welding were made possible, if a proper distribution of inherent shrinkage behind arc was assumed.