Auxiliary device and construction method for single-side welding and double-side forming butt welding of small-sized triangular pipes

Abstract

The invention discloses a butt welding auxiliary device for single-side welding and double-side forming of a small-sized triangular pipe and a construction method. For the bottom plate that fits the bottom surface of the inner hole of the triangular tube to be welded, the triangular support body and the bottom plate are connected to the support frame through multiple elastic connectors. Both sides of the support frame are provided with guides connecting the triangular support body and the bottom plate. The component includes a support cylinder and a support rod, and the bottom plate of the main limit device is provided with a glue hole connecting the lower side of the bottom plate and the inner cavity of the support cylinder. In the construction method of the present invention, the auxiliary device is used to fix the ceramic liner inside the welding seam of the first triangular pipe and the second triangular pipe. The invention overcomes the size limitation of the small-sized triangular tube, utilizes the characteristics of the triangular tube itself, and can support the three inner surfaces of the triangular tube through two supporting pieces.

Description

technical field [0001] The invention relates to the technical field of small-size triangular tube single-side welding and double-side forming butt welding construction technology, and more specifically, relates to a small-size triangular 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 triangular tube 201 and the second triangular tube 202 by adhesive tape 204, only one side of the steel structure is welded, and bot...

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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 diameters and cannot be entered by people. When two small-sized triangular steel pipes are used for butt welding construction, it is difficult for workers to enter the triangular steel pipes. The ceramic liner is pasted inside, so the conventional single-side welding and double-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 weld during on-site welding. Sliding occurs, and the accuracy 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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