Effect of heat input parameters on deformation during gas heating

This study examines the deformation caused by gas heating.Gas heating is a technique used in shipbuilding and other industries for plate bending and the straightening of welding-induced distortions.To examine the influence of various parameters on deformation during gas heating, dimensional analysis and Thermo-elastic-plastic analysis using Idealized Explicit FEM were employed.As a result, six dimensionless parameters were derived, including heat input, heating speed relative to thermal conductivity, shape of heat source, heat transfer, and specimen geometry.The validity of these parameters was verified by comparing temperature distributions obtained through thermal conductivity analysis.This study revealed that the heat source shape parameter significantly affects both transverse shrinkage and angular distortion, especially in gas heating conditions where the heat input distribution is wider than its distribution in welding.The parameter of heating speed showed a more significant effect on angular distortion in gas heating compared to welding.It was found that transverse shrinkage in gas heating is strongly affected by the heat source shape parameter and heat distribution parameter.Furthermore, angular distortion could be effectively organized using the heat distribution parameter for both welding and gas heating conditions.These findings contribute to a better understanding and prediction of deformation in gas heating processes, enhancing accuracy and efficiency in construction of steel structures.