Argon filling tool for backing argon arc welding of large-diameter pipeline to prevent back oxidation

Abstract

The argon filling tool comprises a plurality of arc-shaped gas filling covers buckled on the back face of a welded junction, the arc-shaped gas filling covers are matched with the pipeline, a stainless steel net is arranged on the opening portion, connected with the welded junction, of each arc-shaped gas filling cover in a lining mode, and stainless steel wires are filled in the arc-shaped gas filling covers. And an inflation interface is arranged on the arc-shaped inflation cover. By the adoption of the structure that the inflation cover is buckled on the back face of the welded junction, before backing welding of the welded junction is started, the inflation cover is filled with argon, deposited metal in the welding process is isolated from air through the argon, oxidation of the welded junction is avoided, meanwhile, only the cover is filled with the argon, the using amount of the argon is small, continuous manual movement is not needed after installation, labor can be reduced, and the welding efficiency is improved. And meanwhile, the safety of argon filling operation can be ensured. In addition, the device is simple in structure, convenient to manufacture and use and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline welding technical field, especially a big -calibre pipeline argon arc welding bottoming prevents back oxidation's argon filling frock. BACKGROUND

[0002] At present, nickel alloy pipeline and stainless steel pipeline are widely used in various devices of petroleum chemical industry. Because nickel alloy, stainless steel pipeline is easy to oxidize in the welding construction process, when adopting argon arc welding bottoming, the front of the weld is generally protected by the argon gas jet of the welding handle, and the back of the weld is easy to contact with air to cause oxidation, so it is necessary to fill argon to protect the back. For the diameter greater than or equal to DN600 above large diameter prefabricated weld of prefabricating plant, the first method is to adopt two side sponge plugging mode, and the second method is to arrange the inside of the pipeline to hold the movable argon filling frock and the front welding arc synchronous movement. The first method adopts sponge plugging mode, because the pipe diameter is large, and the pipe is also long, a large amount of argon is needed, and the cost is high. The second method needs to arrange the inside of the pipeline to climb into the pipeline, and the bottoming welding synchronous operation, the labor cost is high, and the inside of the pipeline is high temperature, the operation environment is also poor, and the safety risk exists in the closed space operation. Therefore, a kind of argon filling structure needs to be designed to solve the problems of large amount of argon, high labor cost and operation safety risk. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a kind of argon filling frock for solving the technical problems existing in prior art, which can reduce the amount of argon, reduce labor, and ensure the safety of argon filling operation.

[0004] The technical scheme adopted by the utility model to solve the technical problems existing in prior art is as follows: a kind of argon filling frock for preventing back oxidation of large diameter pipeline argon arc welding bottoming, comprising a plurality of arc-shaped gas filling covers buckled on the back of weld, the arc-shaped gas filling cover is consistent with the pipeline, the mouth portion of the arc-shaped gas filling cover and the weld is lined with stainless steel mesh, stainless steel wire is filled in the arc-shaped gas filling cover, and a gas filling interface is arranged on the gas filling cover.

[0005] The arc-shaped gas filling cover has multiple, is uniformly distributed along the circumference, is supported by a radial support, the radial support is provided with a support rod corresponding to the arc-shaped gas filling cover, the support rod adopts a telescopic structure, and a fixed support positioning groove consistent with the support rod is arranged on the gas filling cover.

[0006] The arc-shaped gas filling cover has 2, and the radial support is composed of a telescopic rod.

[0007] The mesh diameter of the stainless steel mesh is 3-4mm.

[0008] The diameter of the steel wire of the stainless steel mesh is 1-2mm.

[0009] The arc-shaped inflatable cover is made of stainless steel sheet.

[0010] The width of the groove of the arc-shaped inflatable cover is 150-200mm,

[0011] The height of the arc-shaped inflatable cover is 40-60mm.

[0012] The utility model has the advantages and positive effects that: through adopting the structure that the arc-shaped inflatable cover is buckled on the back of the welding opening, the arc-shaped inflatable cover is filled with argon before the bottom welding of the welding opening starts, the argon separates the deposited metal in the welding process from the air, avoids the oxidation of the welding opening, the structure only fills the arc-shaped inflatable cover with argon, the amount of argon is small, manual continuous movement is not needed after installation, the utility model can reduce the labor cost, ensure the safety of argon filling operation, and has the advantages of simple structure, easy manufacturing and use, and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The utility model discloses an embodiment applied structure schematic view;

[0014] Figure 2 The utility model discloses an embodiment structure schematic view.

[0015] In the drawing: 1, welding opening, 2-1, 2-2 are arc-shaped inflatable cover, 3, radial support, 4, inflatable interface, 5, fixed support positioning groove. DETAILED DESCRIPTION

[0016] In order to further understand the invention content, characteristics and efficacy of the utility model, the following embodiments are exemplified, and the detailed description is as follows in cooperation with the drawings:

[0017] Please refer to Figure 1 and Figure 2 A kind of arc welding bottom of large-diameter pipeline argon prevents back oxidation of inflatable tool for filling argon, including a plurality of arc-shaped inflatable cover 2-1, 2-2 buckled in the back of welding opening 1, the arc-shaped inflatable cover 2-1, 2-2 is in line with pipeline, the mouth portion of the arc-shaped inflatable cover 2-1, 2-2 and welding opening is lined with stainless steel mesh, stainless steel wire is filled in the arc-shaped inflatable cover 2-1, 2-2, inflatable interface 4 is arranged on the arc-shaped inflatable cover 2-1, 2-2.

[0018] In the embodiment, the arc-shaped inflatable covers 2-1, 2-2 are multiple and are uniformly distributed in the circumferential direction and are supported by the radial supports 3, the radial supports 3 are provided with support rods corresponding to the arc-shaped inflatable covers 2-1, 2-2, the support rods adopt a telescopic structure, and the arc-shaped inflatable covers 2-1, 2-2 are provided with fixed support positioning grooves 5 matching the support rods. Preferably, the arc-shaped inflatable covers 2-1, 2-2 are two, the radial supports 3 are composed of one telescopic rod, the structure is simple, the use is convenient, one set can be arranged when welding, and after the welding is completed, the radial supports 3 are moved to the next welding position; or several sets can be uniformly arranged along the welding opening to cover the entire welding opening.

[0019] Preferably, the mesh diameter of the stainless steel mesh is 3-4 mm, and the wire diameter of the stainless steel mesh is 1-2 mm. The arc-shaped inflatable covers 2-1, 2-2 are made of stainless steel sheets. The groove width of the arc-shaped inflatable covers 2-1, 2-2 is 150-200 mm, the height of the arc-shaped inflatable covers 2-1, 2-2 is 40-60 mm, and the length is determined according to the length of the welding opening and the number of the arc-shaped inflatable covers.

[0020] When applied, water-soluble paper is pasted on the front of the welding opening, and the inflatable cover is arranged on the back of the welding opening, the inflatable cover is matched and buckled on the welding opening, argon is filled into the inflatable cover on the back of the welding opening through the inflatable hole before welding, after the inflatable cover is filled with argon, a small amount of water-soluble paper at the end of the welding opening is removed, and the backing welding is started.

[0021] Although the preferred embodiment of the utility model is described above in combination with the drawings, the utility model is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative and are not restrictive, and a person skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection scope of the utility model.

Claims

1. A large-diameter pipe argon arc welding backing to prevent backside oxidation of argon filling tooling, characterized by, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

2. The large-diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling according to claim 1, characterized in that, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

3. The large-diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling according to claim 2, characterized in that, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

4. The large diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling of claim 1, wherein, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

5. The large diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling according to claim 4, characterized in that, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

6. The large diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling of claim 1, wherein, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

7. The large diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling of claim 1, wherein, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

8. The large diameter pipe argon arc welding backing anti-backside oxidation argon filling tooling of claim 1, wherein, The arc-shaped inflatable cover is filled with stainless steel wire, and the arc-shaped inflatable cover is provided with an inflation interface.

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