An in-process method for controlling welding distortion in Hatch Cover Girders due to fillet welds is developed. It particularly reduces linear and angular distortion by performing FAIRING (triangular heating and triangular cooling) after the weld process. Various heating conditions are examined by experiment and by the lab test analysis (Geographic information system) in order to determine appropriate conditions and to study the mechanism by which welding distortion is reduced. It is consequently found that this mechanism is a result of two main effects: triangular heating effect on one side and triangular cooling effect on other side, which produces the opposite linear and angular distortion.
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