Abstract
In order to evaluate the safety of the buildings the structures of which was repaired, it is very important to estimate the performance of the weld structural parts. This study is based on the experiment; after giving weld repair to the distorted SM490A steel member with weld joint in the condition which is like the actual weld work, we examined the mechanical behavior and property. The study led to the following results. 1)In the cold condition, the toughness doesn't change after giving weld repair to the broken steel member with weld joint. 2)The weld repaired steel member has the lower tensile strength than the original member. 3)The steel member with more load than elasticity has the higher tensile and yield strength and the less deformation. 4)The weld repaired section has father improved on mechanical behavior in the cold condition than the pre-loaded member.
