The manual flame heating has been used in the conventional line heating to form the curved plate. High frequency induction heating could be a good alternative process for the automation of line heating process because of its easiness to control the heat flux. The purpose of this study is to establish the predictive method of the angular distortion caused by the line heating process with high frequency induction heating. The efficiency of high frequency induction heating system was determined by comparing the temperature measurement results and FEA. The proper range of inductor speed was suggested to prevent the degradation of plates with various thicknesses by FEA. The validity of the proper range of the critical heating conditions was verified by mechanical test and microstructure observation for the heated plates. Based on these results, the extensive line heating tests were carried out to evaluate the effect of size, internal restraint and strength of plates on the angular distortion. The predictive equation for the angular distortion was established with a function of heat intensity, bending rigidity, size, variations along the heating line and strength of plates.

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