Steel box girder unit part stiffening rib welding method

Abstract

The invention discloses a steel box girder unit part stiffening rib welding method. The method comprises the steps that S1, a welding positioner of a steel box girder unit part is arranged in the manner that an operation face and the level ground forms an included angle of 45 degrees; S2, a stiffening rib and the steel box girder unit part are fixed in a spot welding manner, and the steel box girder unit part is attached to the welding positioned; S3, a welding trolley with a CO2 protection welding gun is arranged on the steel box girder unit part, a protection sleeve on the CO2 protection welding gun is taken down, a contact tube at the end of the CO2 protection welding gun is exposed out, a welding wire on the CO2 protection welding gun is aligned to a welding bead, and the stretching length of the welding wire ranges from 10 mm to 15 mm; and S4, after CO2 gas protection of the CO2 protection welding gun is stopped and the welding bead is covered with a submerged-arc welding agent with the thickness being 50 mm, the welding trolley drives the CO2 protection welding gun to move, and meanwhile the CO2 protection welding gun carries out welding. The method is good in forming effect, high in welding quality, high in work efficiency, simple in modification and low in cost.

Description

technical field [0001] The invention belongs to the field of steel box girder construction, and in particular relates to a method for welding stiffeners of steel box girder unit elements. Background technique [0002] At present, the steel box girder structure is more and more common for bridges. The stiffeners on the steel box girder middle cover and bottom plate unit elements are mostly U, T-shaped ribs and plate ribs, and the stiffeners on the web plate unit elements are mostly plate ribs. However, the number of stiffeners on these unit elements is relatively large, and the total length is too long. The traditional single element stiffener welding method is to use CO 2 The gas shielded welding trolley is used for welding, and the welding trolley is higher than the original manual welding in terms of welding accuracy and welding efficiency. But due to CO 2 Gas shielded welding is easily affected by factors such as shielding gas pressure, flow rate, and ambient wind spee...

AI Technical Summary

Problems solved by technology

But due to CO 2 Gas shielded welding is easily affected by factors such as shielding gas pressure, flow rate, and ambient wind speed, resulting in defects in the appearance of the weld, and more welding spatter. The cycle is too long, affecting the production cycle

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