Device and method for filling pipeline with argon

Abstract

The invention provides a device and a method for filling a pipeline with argon. By the aid of the device and the method, argon filling protection is performed on the last welded junction of the pipeline between equipment. The device for filling the pipeline with the argon comprises an argon chamber device and a power device; the argon chamber device comprises two blocking elements; the two blocking elements are retractable elements, are connected through a connecting piece and are matched with the inner wall of the pipeline to form an argon chamber corresponding to the welded junction; the power device comprises a device body which is detachably connected with the argon chamber device, a walking mechanism arranged on the device body and used for driving the power device to move in the pipeline, a positioning mechanism which is arranged on the device body, comprises a telescopic positioning piece and abuts against the inner wall of the pipeline in an extending state so as to fix the power device in the pipeline and a control module in signal connection with the walking mechanism and the positioning mechanism and used for controlling the walking mechanism and the positioning mechanism to act respectively.

Description

technical field [0001] The invention belongs to the technical field of welding auxiliary equipment, and in particular relates to a device and method for filling argon inside a pipeline. Background technique [0002] When welding high-alloy steel pipes such as stainless steel or non-ferrous metal pipes such as aluminum and titanium, it is necessary to fill the pipe with argon to protect the back of the weld and prevent welding defects caused by air oxidation on the back of the weld. At present, there are mainly the overall argon filling method and the local argon filling method for the internal argon filling method during pipeline welding: [0003] 1) Integral argon filling method: For small diameter pipes or short pipes, the overall argon filling method can be used. This method is relatively simple. Exhaust holes, and paste tape on the outer wall of the pipe at the weld. You can leave a space on the tape for the insertion of the argon gas pipeline, or you can completely sea...

AI Technical Summary

Problems solved by technology

[0005] For the last welding joint of the pipeline between the equipment, because the pipeline on both sides is long and the structure is complex, there are often bends and / or diameter changes. If the overall argon filling method is used, a large amount of argon gas will be wasted , and the argon concentration is difficult to control, and the welding quality is difficult to guarantee. If the local argon filling method is used, it is difficult to take out the ordinary plugging parts after the welding is completed. Therefore, water-soluble paper is often used to block the pipes on both sides of the weld to form argon After the welding is completed, the water-soluble paper is discharged from the pipeline through pipeline flushing, but this method is only applicable to pipelines flushed with water, and pipelines flushed or purged in other ways cannot be used (especially oil pipelines cannot use water-soluble paper). paper), and it is easy to leave water-soluble paper residues in the pipeline, which affects the cleanliness of the pipeline, and may even cause small tube valves to be blocked by water-soluble paper residues

[0006] The traditional method of argon filling has limitations when protecting the last welding joint of the pipeline between equipment with argon. Therefore, how to solve the problem of filling the last welding joint with argon and improve the utilization rate of argon to ensure that the welding time of the pipeline is The argon concentration is particularly important, especially in the application of stainless steel pipelines and long-distance pipelines in important and precision equipment

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