Abstract
The authors proposed the simple approximate equations for estimating thermal cycle of bond of Tjoint considering the change of heat flow and law of similitude in geometrically similer specimen. These approximate equations have terms of plate thickness-ratio and heat input.
Unbalance of heat input and heat-exchange between veritcal and horizontal plate have not so much effect on the thermal cycle of bond. Therefore, these equations are able to use for practical case.
Estimated values from these equations nearly corresponded to the experimental values obtained from arc welding with coated electrode.
