Weld joint back face gas protection system

Abstract

The invention discloses a weld joint back face gas protection system and relates to the technical field of welding. The system includes a gas protection device, a positioning mechanism and a drive mechanism. The gas protection device comprises a back protection gas cover, a water cooling component and a gas protection component, and the gas protection component is used for providing protection gasfor the back protection gas cover; and the water cooling component is used for providing cooling water for the back protection gas cover to simultaneously cool the back protection gas cover and the protection gas. The positioning mechanism is used for achieving automatically centering to the axis of a pipe with the inner wall of the pipe as a positioning reference, and is used for ensuring that gaps between the back protection gas cover and the inner wall of the pipe to be consistent in the circumferential direction. The drive mechanism is used for driving the back protection gas cover to rotate. Meanwhile, the driving device drives the back protection gas cover to rotate, meanwhile, the gas protection device is used for cooling the back protection gas cover, the protection gas cooling and weld joint gas protection, and the good gas protection effect is achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a gas protection system for the back of a weld. Background technique [0002] Back weld seam protection is required when welding high alloy, titanium and titanium alloy, nickel and nickel alloy pipes. Backside protection is a key factor in ensuring the quality of welded joints. Commonly used in engineering is the traditional back argon protection method, that is, argon is filled from one end of the pipe to the weld; the disadvantages of this method are obvious: waste of gas (large amount of gas); it takes a long time to inflate in advance; During the construction of long pipelines, soluble paper should be added to the inner welds to block the air, and the pipelines should be cleaned to remove them after welding. [0003] At present, argon gas protection is also carried out through the back gas protection cover. The back gas protection cover usually used has the following disad...

AI Technical Summary

Problems solved by technology

Commonly used in engineering is the traditional back argon protection method, that is, argon is filled from one end of the pipe to the weld; the disadvantages of this method are obvious: waste of gas (large amount of gas); it takes a long time to inflate in advance; During the construction of long pipelines, soluble paper should be added to the inner welds to block the air, and the pipelines should be cleaned to remove them after welding.

[0003] At present, argon gas protection is also carried out through the back gas protection cover. The back gas protection cover usually used has the following disadvantages: the degree of automation is low, and the worker usually needs to manually rotate the back gas protection cover; The tail flame and splash residue formed through the entire section of the weldment drop on the gas cover and burn the gas cover

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