A combined submerged arc welding device and a method for butt welding large-diameter steel pipes

Abstract

A combined submerged arc welding device, including a submerged arc welding machine, a two-way adjustment frame and a roller frame for supporting large-diameter steel pipes. The two-way adjustment frame includes a machine base, a column and a rocker arm. The end is slidably and rotationally connected with the column and positioned by the locking bolt. The submerged arc welding machine is installed on the rocker arm through the support plate, and the support plate is slidably connected with the rocker arm and positioned by the locking bolt; The submerged arc welding machine includes a welding machine control box, a submerged arc welding head and a welding wire reel installed on the support plate through the welding machine beam, and is electrically connected to the external submerged arc welding machine host through wires. The method for performing butt welding on large-diameter steel pipes includes assembling a combined submerged arc welding device, hoisting the large-diameter steel pipes and welding. The submerged arc welding device is easy to install, disassemble and carry, reasonable in structure, and strong in adaptability: it is suitable for butt welding of steel pipes with diameters ranging from 500mm to 2000mm. The method is simple to operate, easy to popularize, and reliable in quality.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a combined submerged arc welding device and a method for butt welding large-diameter steel pipes. Background technique [0002] Butt welding of large-diameter steel pipes is a problem often encountered in construction. For butt welding of large-diameter steel pipes, submerged arc welding is generally used. Submerged arc welding is a method in which the arc burns under the flux layer for welding. It has stable welding quality. , high welding productivity, no arc light, less smoke and less pollution, etc., making it the main welding method in the manufacture of important steel structures such as pressure vessels, pipe sections, and box-shaped beams and columns; due to the existing submerged arc welding equipment It is a trolley-type submerged arc welding machine, which mainly welds straight-line welds. It has obvious advantages in welding long straight welds, but it is not suit...

AI Technical Summary

Problems solved by technology

[0002] Butt welding of large-diameter steel pipes is a problem often encountered in construction. For butt welding of large-diameter steel pipes, submerged arc welding is generally used. Submerged arc welding is a method in which the arc burns under the flux layer for welding. It has stable welding quality. , high welding productivity, no arc light, less smoke and less pollution, etc., making it the main welding method in the manufacture of important steel structures such as pressure vessels, pipe sections, and box-shaped beams and columns; due to the existing submerged arc welding equipment It is a trolley-type submerged arc welding machine, which mainly welds straight-line welds. It has obvious advantages in welding long straight welds, but it is not suitable for butt welding of steel pipes with circular welds, especially large-diameter steel pipes.

[0003] Due to the large size and weight of large-diameter steel pipes, there is no particularly effective method at present. The large-scale equipment dedicated to butt welding of large-diameter steel pipes is not only complex in structure but also expensive. Butt welding of large-diameter steel pipes has the following technical problems:

[0004] 1. The submerged arc welding head is not easy to adjust, and cannot adapt to the welding of steel pipes with different diameters and specifications, and has poor versatility;

[0005] 2. The operation is cumbersome, the efficiency is low, and the quality is difficult to guarantee

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