Abstract
In order to manufacture I section of bridge, the fillet welding of the both sides for the web is conducted simultaneously, or conducted one side sequentially. The angular distortion will occur in the case of simultaneous welding, the leaning deformation on the flange to the first welding side will occur in the case of sequential welding for the thick plate. Compared with the angular distortion, it is difficult to correct the leaning deformation on the flange. If we can estimate the amount of the leaning deformation on the flange to first welding side, we will be able to set the flange lean to the second welding side before welding and keep the flange right angle to the web without correcting the deformation after welding. We conducted some cases of experiment and thermal elastic-plastic analysis for I section with sequential fillet welding. From the results, we developed the program for estimating the leaning deformation on the flange with tandem submerged arc welding method sequentially, and we applied to the actual bridge manufacturing. Consequently, we reduce the correcting work drastically, and achieve the cost reduction in production.
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