Robotic horizontal single-pass symmetrical welding method for u-shaped rib fillet welds on orthotropic plates

Abstract

The invention relates to a flat position single-seam symmetrical welding method for an orthotropic plate U-shaped rib corner welding seam robot. The method comprises the following steps that A, U-shaped rib groove processing, compression and bridge deck plate blanking are carried out for obtaining a U-shaped rib plate unit through assembly; B, the U-shaped rib plate unit is horizontally placed on a reverse deformation turning moulding bed, and the position of the U-shaped rib plate unit is regulated so that the center line of the U-shaped rib plate unit is coincident with the center line of the turning moulding bed; C, the U-shaped rib plate unit is clamped and fixed, in addition, reverse deformation is carried out, the turning angle of the reverse deformation turning moulding bed is regulated so that a U-shaped rib to be welded is positioned in the horizontal position, and in addition, an angle scale is used for detection; D, the welding program and the welding specification parameters are input into a robot automatic welding system so that two welding hands arranged on a robot cantilever respectively and simultaneously carry out flat position single-seam welding on the angle welding seams of the two sides of the U-shaped rib. The method provided by the invention has the advantages that the U-shaped rib is assembled on the platform, the assembling precision is high, and a gap between the U-shaped rib and a bridge deck plate can be enabled to be within 0.5mm. The robot automatic welding hand has the electric arc tracking function, the change of the welding current and the electric arc voltage is sensed through swinging in the welding process, and the small deviation of a weld pass is corrected.

Description

technical field [0001] The invention relates to a welding method for U-shaped rib fillet welds of orthotropic plates by robots, in particular to a flat-position single-pass symmetrical welding method for U-shaped rib fillet welds of bridge panels in the manufacture of steel bridges, which belongs to large-scale steel Component welding technology field. Background technique [0002] Orthotropic slab steel bridges are widely used in long-span steel bridges because of their relatively light weight. Longitudinal stiffeners of orthotropic plates usually use plate ribs, T-shaped ribs or U-shaped ribs, and U-shaped ribs are more popular because of their advantages such as less welds, small deformation, light weight, and higher bending and twisting resistance. The first choice for many designs. However, U-shaped rib fillet welds are very sensitive to fatigue properties, and fatigue cracks are prone to occur during the service of steel bridges. Therefore, it is particularly importa...

AI Technical Summary

Problems solved by technology

At present, the U-shaped rib fillet welds are generally welded by manual gas shielded welding or with a fillet weld tracker method. The ship position is welded in two steps, that is, the first backing welding and the second covering. The production efficiency is low, and it is affected by human factors. , the quality of U-shaped rib fillet welds fluctuates to a certain extent, the penetration depth of welds is unstable, and it is difficult to maintain consistency in appearance

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