Angular Deformation of Steel Frame Core Welded by Robot and Improvement Method.

Angular deformation of a steel frame core welded by a robot is larger than the deformation during manual welding. In this study, several welding condition parameters which seem to influence the angular deformation are discussed. We conclude that the difference in angular deformation between the robot and manual welding was caused by the change of interpass temperature (To). Computer FEM simulation predicted the effects of To; namely, the angular deformation decreased with increasing To. The experimental results supported the results of FEM analysis; actually the angular deformation of the core welded by a robot at high interpass temperature (To=573K) was half of that at low interpass temperature (To=273K).