Circumferential seam butt welding protection device

Abstract

A circumferential seam butt welding protection device comprises a fixed sleeve and a rotating shaft. One end of the rotating shaft is inserted into the fixed sleeve, a plurality of link mechanisms are arranged on the fixed sleeve, two thread sections with different thread pitches are arranged on the rotating shaft, an opening-closing slider is arranged on the first thread section, a rotating slider is arranged on the second thread section, and the link mechanisms are respectively connected with the rotating slider and the rotating slider. When the circumferential seam butt welding protection device is in welding preparation, the umbrella-shaped link mechanisms on the rotating shaft play a role, a plurality of back protection cooling blocks form a circumferentially arrayed device by means of synchronous sliding of the opening-closing slider and the rotating slider. During welding, the circumferentially arrayed device can be used for protecting the fronts and the backs of circumferential seams of an end cap and a cylinder body of a closed cylindrical container by means of back cooling and gas protection for a workpiece to be welded. By the aid of the circumferential seam butt welding protection device, the welding quality of the circumferential seams can be ensured, and crevice corrosion and over oxidation of the backs of the circumferential seams in conventional circumferential seam lap welding are avoided.

Description

technical field [0001] The invention relates to a protective device for circular seam butt welding, which belongs to the technical field of welding equipment. Background technique [0002] Two common technical defects are encountered in the girth welding of thin-plate airtight cylindrical containers: (1) because the plate is too thin and easy to deform, lap joints are used in production to realize girth welding. However, lap joints will create structural gaps, resulting in crevice corrosion of steel, which will reduce the service life of welded products. (2) For the welding of the circular seam of the closed cylindrical container, especially the welding of the end cap and the barrel section of the closed container, it is difficult to realize the cooling and protection of the back of the weld, which leads to the short life of the entire container. The current argon-shielded welding machine only protects the upper surface of the weld with argon gas, while the lower surface of...

AI Technical Summary

Problems solved by technology

[0002] There are two common technical defects encountered in the welding of the circular seam of the thin-plate airtight cylindrical container: (1) Because the plate is too thin and easy to deform, the form of lap joint is used to realize the circular seam welding in production.

However, lap joints will create structural gaps, resulting in crevice corrosion of steel, which will reduce the service life of welded products

(2) For the welding of the circular seam of the closed cylindrical container, especially the

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