Large-diameter thick-wall steel pipe welding equipment

Abstract

The invention belongs to the technical field of steel pipe welding equipment, and particularly relates to large-diameter thick-wall steel pipe welding equipment. In order to overcome the defect that an existing large-diameter thick-wall spiral welded pipe is formed through one-time welding and is difficult to repair, the following technical scheme is adopted, the large-diameter thick-wall steel pipe welding equipment comprises a positioning pre-welding device, a diameter measuring device and a precise welding device, wherein the positioning pre-welding device is used for pre-welding the steel pipe; the diameter measuring device is used for measuring the diameter and the ovality of the steel pipe; the precise welding device is used for carrying out performance welding on the steel pipe; and the precise welding device is located behind the positioning pre-welding device in the advancing direction of the steel pipe. According to the large-diameter thick-wall steel pipe welding equipment, a secondary welding mode is adopted, diameter measurement is carried out after positioning and pre-welding, and repairing is conveniently carried out when the steel pipe is unqualified; and positioning pre-welding has a preheating effect, the steel pipe temperature rise speed and temperature rise amount are reduced, the welding quality is improved, and the steel pipe performance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of steel pipe welding equipment, and in particular relates to a large-diameter thick-walled steel pipe welding equipment. Background technique [0002] At present, large-diameter thick-walled spiral welded pipes are widely used in the fields of steel pipe pile engineering, fluid conveying pipelines, and steel structures. It is crimped and welded to produce a spiral steel pipe with a helical weld and a butt weld (the welding seam of the previous steel strip tail and the rear steel strip head). Among them, the spiral weld is generally welded by double-sided automatic submerged arc welding, and the front of the butt weld (that is, the inner side of the spiral welded pipe) is generally welded by automatic submerged arc welding. [0003] The current spiral welded pipe production process is directly welded to form a spiral weld. However, during production, it was found that when the spiral weld seam is formed by...

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Problems solved by technology

[0005] The present invention aims at the defect that the existing large-diameter thick-walled spiral welded pipe adopts one-time welding and is relatively difficult to repair, and provides a large-diameter thick-walled steel pipe welding equipment, which can be welded twice to reduce the difficulty of repairing

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