Abstract
Lamellar tearing of opening type and root cracking occasionally occur in multipass welded corner joints.
In this paper, the influence of welding methods such as submerged arc welding (SAW) and covered arc welding (SMAW) is investigated on the occurrence of these weld cracks. The main results obtained in this study are as follows.
(1) When SAW is applied, the transverse welding residual stress (σx) is less on the edge surface of the vertical plate and the lamellar tearing is less probable to occur in comparison with SMAW.
(2) By SAW, σx, induced at the root is less and root cracking is less probable to occur against SMAW.
Accordingly, in order to prevent occurrence of the weld cracks in multipass welded corner joints, it is effective to use SAW whose deposited metal weight per unit welding pass is large and which enables to fill up a given groove with smaller number of passes.
