Experiment and numerical simulation in temperature distribution and welding distortion in GMA welding

Abstract

The accuracy of dimension in the steel structure after welding becomes an important problem in the product cost. The control of the welding distortion is demanded in the steel structure welding to improve the productivity. For this purpose, the estimation of the amount of the deformation is needed and its behavior is investigated. In this paper, the numerical model of the heat source was proposed in the GMA welding. The fundamental welding experiments in the bead on welding were carried out to improve the accuracy of the numerical model. The cross section in the simulation result was agreed with the experimental results. During the welding, the behavior of the deformation and the temperature distribution was investigated by using the laser sensor and a thermoelectric couple. Dynamic behavior of the deformation was investigated during the welding. The visualizations of the dynamic behavior of deformation were tried by using the numerical analysis. The behaviors were good agreement with the experimental results.