Equipment special for girth welding of steel pipe and welding neck flange

Abstract

The invention relates to equipment special for girth welding of a steel pipe and a welding neck flange. The equipment comprises a platform, a console and a welding device, wherein a fixing tool for placing a steel pipe and a flange to be welded, a steel pipe autorotation mechanism for driving the steel pipe to rotate at a uniform speed, a lifting mechanism, and a horizontal moving mechanism capable of moving horizontally on the lifting mechanism are arranged on the platform; and a welding head of the welding device is fixed at an end part of the horizontal moving mechanism, and can extend into the steel pipe and reach a welding position of an inner side weld joint from a flange end under the combined action of the lifting mechanism and the horizontal moving mechanism. After the steel pipe and the flange are placed to the fixing tool, the welding head can be adjusted freely to be aligned to the center of a butt-welded seam, so as to perform girth welding. The inner side and the outer side of the steel pipe can be welded twice to form an inner girth welding seam and an outer girth welding seam; and when the inside of the steel pipe is welded, the welding head extends into the steel pipe from the flange end, the welding process is fully automatic, the welding production efficiency is high, and the welding quality is stable.

Description

[0001] technical field [0002] The invention relates to a welding equipment, in particular to a special equipment for welding a steel pipe and a high neck flange. [0003] Background technique [0004] With the rapid development of electric power construction, the requirements for the voltage level of transmission lines are getting higher and higher, and UHV projects are gradually being applied. Butt welding between neck forged flange and steel pipe is a key processing difficulty. [0005] The circumferential butt weld between the high-neck flange and the steel pipe is required to meet the first-class weld quality standard. In the past, manual welding was generally used for circular seam welding, which was inefficient and unstable in welding quality. It required a certain level of professional welding personnel to operate. The cost is large, and the stability of its production efficiency and welding quality is poor. Although the current welding equipment has higher produ...

AI Technical Summary

Problems solved by technology

[0005] The circumferential butt weld between the high-neck flange and the steel pipe is required to meet the first-class weld quality standard. In the past, manual welding was generally used for circular seam welding, which was inefficient and unstable in welding quality. It required a certain level of professional welding personnel to operate. High cost, poor production efficiency and welding quality stability

Although the current welding equipment has higher production efficiency than manual welding, it has the disadvantage of being suitable for both internal and external welding. For example, the public technology named "welding machine" (authorized announcement number CN 101780583B) belongs to a platform lifting type simplified circular seam Longitudinal seam welding machine, which includes columns arranged parallel to each other, a power platform connected between the column components, and a welding platform located between the columns and capable of moving up and down along the columns; welding guide rails are set on the welding platform, and on the welding guide rails Sliding connection welding head; under the welding head, a rotating platform is set to support the workpiece to be welded

The disclosed technology can weld the longitudinal seam of the cylinder, and can also weld the circular seam of the cylinder, but obviously it can only be welded on the outer circumference of the cylinder, and cannot be welded to the inner circumference, cannot form internal and external double welds, and cannot form high-quality welding

Therefore, the existing methods, no matter manual or mechanical equipment, are not enough to meet the requirements of the circumferential butt weld between the high neck flange and the steel pipe

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