Power transmission tower foot welding process

Abstract

The invention provides a power transmission tower foot welding process. The mode that three welding passes are implemented in a staggered manner for two welding seams at symmetrical positions is matched; furthermore, the welding directions of base layers, surface layers and packing layers are the same; welding equipment does not need to be reset, and therefore, the welding efficiency is high; thetwo welding seams at the symmetrical positions are adopted; and firstly, the base layers of the two welding seams are welded, then, the packing layers of the two welding seams are welded, and finally,the surface layers of the two welding seams are welded. In this way, the time interval between the two symmetrical welding seams can be shortened, and stress concentration is prevented; in addition,staggered type welding is conducted between the two welding seams; the time interval between every two welding layers is long, heat accumulation is prevented, and the welding quality is higher; and for four welding seams at the staggering positions of main rib plates, three welding passes are completed in a symmetrical and alternate manner, and stress concentration and heat accumulation can be prevented.

Description

technical field [0001] The invention relates to the field of electric transmission towers, in particular to a welding process for the feet of electric transmission towers. Background technique [0002] The transmission tower is a towering structure, mainly made of steel structure, which is very sensitive to inclination, deformation, and welding strength, and has high requirements for uneven settlement of the foundation. During the welding process, false welding or welding residual stress and deformation may cause the transmission tower to deflect or even overturn. However, since the residual stress and deformation caused by temperature changes after welding have always been a difficult problem to be solved in the welding industry, the distribution of welding temperature field has always been a hot spot for domestic welding researchers. [0003] In the existing welding process of the tower foot of the transmission iron tower, when welding the rib plate and the bottom plate, ...

AI Technical Summary

Problems solved by technology

In this way, when performing welding of a single weld, due to the short interval between three-layer welding, it is easy to form heat accumulation and affect the welding effect; secondly, because each welding layer is completed, the welding equipment needs to be reset. Then start the welding of the next layer from the beginning, so the welding efficiency is low; in addition, the interval between two symmetrical welds is long, and repeated heating and welding of the same position will easily lead to stress concentration and affect the welding quality

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