Large-diameter pipeline welding device

Abstract

The invention discloses a large-diameter pipeline welding device which comprises a pipeline support fixture, wherein the pipeline support fixture comprises a horizontally arranged pipeline support suspending arm, a first vertical post, a second vertical post, a track, a dorsal gas trolley, a driving device, a gas box and a gas pipe, wherein the first vertical post and the second vertical post are arranged at two ends of the pipeline support suspending arm; the track is arranged on the pipeline support suspending arm; the dorsal gas trolley is slidably arranged on the track; the driving device drives the dorsal gas trolley to move; the gas box is arranged on the dorsal gas trolley; the top of the gas box is provided with a gas outlet; and the gas outlet end of the gas pipe is communicated with the inner cavity of the gas box. A pipeline welding dorsal gas protection device provided by the invention is provided with the dorsal gas trolley which moves synchronously with the welding torque, and the gas box is installed on the dorsal gas trolley, and an inert gas is transmitted into the gas box through the gas pipe so as to achieve the aim of partial dorsal gas protection. Compared with the prior art, the pipeline welding dorsal gas protection device provided by the invention can be used for greatly shortening the gas inflation time, greatly improving the production efficiency, reducing the using amount of the inert gas and greatly lowering the cost.

Description

technical field [0001] The invention relates to a welding device, in particular to a large-diameter pipeline welding device. Background technique [0002] In addition to the high-temperature molten pool on the front of the weld that needs proper protection during metal welding, necessary measures must also be taken on the back of the weld to block the oxidation of the oxygen in the air to the weld. Usually inert gas is considered to be a better protective medium. The device that can be used to implement gas protection on the back side of the weld is called "back gas protection device" in the industry. [0003] In the existing metal welding process, if the workpiece is tubular, both ends of the pipe are usually sealed and filled with inert gas for protection, so as to reduce the oxygen content inside the pipe, thereby reducing the degree of oxidation. If the workpiece is flat, it is necessary to place a strip-shaped gas tank with the same length as the workpiece under the w...

AI Technical Summary

Problems solved by technology

However, in these two methods, the consumption of inert gas is large, resulting in high production cost; the inflation time is long, resulting in low production efficiency; and due to the large space inside the pipeline or the gas tank, even if a large amount of inert gas is filled, it still cannot be effectively emptied Air, the protection effect is very poor, which seriously affects the welding quality, resulting in the need to polish or pickle the weld seam after welding, wasting a lot of manpower and material resources

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