Study of welding residual stress by means of laser holography interference

摘要

Abstract: According to the principle of laser holography interference, the relation between interference streaks and minute displacement of the point is analyzed in this paper. And according to the principle of elastic mechanics, the relation between minute displacement and welding residual stress is deduced. A set of experimental optical lines is designed to obtain the holography interference pictures. The calculation of the welding residual stress is based on the pictures. And the result has shown that the law of distribution of the welding residual stress obtained through the experiments agrees with the theoretical analyses.!4