Abstract
An in-process method for controlling welding distortion in fillet welds is described. It particularly reduces angular distortion by performing reverse-side tungsten inert gas (TIG) heating of the weld line at a fixed distance ahead of metal inert gas (MIG) welding during the weld process. Various heating conditions are examined by experiment and by finite-element analysis 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: a TIG heating effect on the reverse side, which produces the opposite angular distortion, and a preheating effect.
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