Analytical Calculation Method of Restraint Stresses and Strains due to Slit Weld in Rectangular Plates

Abstract

There are many metallurgical and dynamical factors which influence initiation of cold cracking at weld joints. However, when welding conditions are specified, the initiation of cold cracking may be predicted by the stress and strain induced at a point where the initiation is expected. In this respect, the stress and strain are the important information to prevent cold cracking from the dynamical point of view.
When a welded joint is simple such as of one dimensional constraint state, the restraint stress of a weld joint can be estimated with a fairly good accuracy by the conventional concept of restraint intensity. On the other hand, restraint stresses and strains of two dimensional constraint state are produced by not only shrinkage of weld metal but also thermal deformation of the plate. In this reason, it is difficult to predict them simply from the geometric configuration of a joint without considering this thermal deformation.
In this paper, thermal elastic-plastic behaviors in a slit type welded joint is idealized and an analytical calculation method for the stresses and strains is developed. And, it is shown that the restraint stresses and strains in any size of slit joints can be calculated simply by this method.