Butt welding auxiliary device for single-side welding and double-side forming of small-size rectangular pipe and construction method

Abstract

The invention discloses a butt welding auxiliary device for single-side welding and double-side forming of a small-size rectangular pipe and a construction method. The auxiliary device comprises a body framework, a ceramic liner, a ceramic liner guide module and a limiting device. The limiting device comprises four tabulate limiting plates arranged on the upper, lower, left and right sides of a supporting framework, each limiting plate is connected with the supporting framework through multiple elastic connecting pieces, the ceramic liner guide module is a tapered square shell, the small end of the ceramic liner guide module is away from the ceramic liner, and the other end of the ceramic liner guide module is fixedly connected with the ceramic liner. According to the construction method,the ceramic liner is fixed to the inner side of a weld joint of a first rectangular pipe and a second rectangular pipe through the auxiliary device. The auxiliary device is high in assembling degree,and components of the auxiliary device are directly installed and used on a welding site after being prefabricated, machined and assembled in a factory. The assembling degree is high, and the weldingconstruction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of small-sized rectangular tube single-side welding and double-side forming butt welding construction technology, and more specifically, relates to a small-size rectangular tube single-side welding and double-side forming butt welding auxiliary device and construction method. Background technique [0002] In the welding construction of steel structures, for some special-shaped parts to be welded (such as boiler pressure vessel components), the double-sided welding process cannot be used, and only the welding technology of single-sided welding and double-sided forming can be used. Currently commonly used one-sided welding and two-sided forming methods are as follows: figure 1 and figure 2 As shown, after the ceramic liner 4 is pasted on the back of the weld seam 205 of the first rectangular tube 201 and the second rectangular tube 202 through an adhesive tape 204, only one side of the steel structure is we...

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Problems solved by technology

[0003] In building steel structures, steel pipes are mainly used to bear weight, not for storage or transportation of materials. Most of them have small cross-sectional dimensions and cannot be entered by people. When two small-sized rectangular steel pipes are butt-welded, workers are not easy to enter the interior. The ceramic liner is pasted, so the conventional one-side welding and two-side forming welding construction cannot be carried out; if the ceramic liner is not pasted, but only fixed by simple physical friction, the ceramic liner is very easy to produce during the welding process on site. Sliding, and the precision of the assembled interface is not easy to control, which seriously affects the welding quality of single-sided welding and double-sided forming

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