APPARATUS AND METHOD OF MONITORING DEFORMATION OF WELD STRUCTURE

PROBLEM TO BE SOLVED: To control execution of welding and heat treatment by monitoring stepwise, during the execution, deformation and stress of a weld structure which is being executed for welding and heat treatment. SOLUTION: The monitoring apparatus includes: a displacement gauge 11 for measuring displacement on the surface of a weld structure 1; a deformation calculating device 12 for calculating deformation amount of the weld structure from the data or the like of the displacement gauge; a thermometer 13 for measuring the surface temperature of the weld structure; a temperature distribution calculating device 14 for measuring temperature distribution of the weld structure from the data or the like of the thermometer; and a determining device 15 for determining a welding deformation of the weld structure during the execution of the welding. The determining device is composed of: a first arithmetic unit 18 for estimating thermal deformation amount by linear expansion of the weld structure; a second arithmetic unit for computing true welding deformation amount by subtracting the estimation of the thermal deformation amount from the deformation amount of the weld structure; and a determining unit 20 for determining success or failure of welding by comparing the true welding deformation amount and an allowable value of the welding deformation amount. COPYRIGHT: (C)2010,JPO&INPIT