Device for improving welding quality of large-size pipeline easily

Abstract

The invention discloses a device for improving the welding quality of a large-size pipeline easily. The device comprises a transverse plate, a connecting assembly, a driving assembly and a plurality of air nozzles. The air nozzles are arranged on the transverse plate in a row, and the extension lines of the jetting ends of the air nozzles are converged at a point. The connecting assembly is connected with the end, away from the air nozzles of the transverse plate. The driving assembly is connected with the connecting assembly and can drive the connecting assembly to move back and forth. Protective gas is jetted from the air nozzles, and the driving device drives the transverse plate to move along with movement of a welding gun. Meanwhile, the intersection of the extension lines of the jetting ends of the air nozzles is located on a weld joint, in this way, when the welding gun is used for welding the large-size pipeline, the space around of the weld joint is filled with protective gas, the situation that the welded portion is oxidized or azotized by air is avoided, the quality of the weld joint is improved easily, and the service life of the pipeline is prolonged.

Description

technical field

[0001] The invention relates to a shielding gas replenishment device for welding, in particular to a device for improving the welding quality of large-scale pipelines. Background technique

[0002] In the petroleum manufacturing industry, it is often applied to large pipelines. During the manufacturing process of large pipes, steel plates are first bent into a cylindrical shape, and then welded to weld the two ends of the steel plates together. In butt welding, gas needs to be filled around the butt weld to ensure welding quality. The shielding gas can be carbon dioxide, argon, etc. It is mainly used as a shielding gas for arc welding or cutting stainless steel, magnesium, aluminum and other alloys, and the appropriate shielding gas is selected according to different welding parts. At present, most large-scale pipeline welding only sprays a certain amount of shielding gas around the welding torch, that is, there is only shielding gas on one side of the weld...

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