An argon filling gas protection device for girth welding in a pipeline

Abstract

The utility model discloses a pipeline internal girth weld argon filling gas protection device, including quick coupling (1), telescopic pipe (2), positioner (3), air injection device (4), bottom plate (5) and adjustable V type frame (6), utilize positioner as pipeline or gas cylinder clamping device, drill hole in the positioner three claw chuck center position, install telescopic pipe, and the telescopic pipe is multisection stretch type, and the even gas input is carried out through three -way pipeline connection mode with air injection device, the utility model discloses can replace different diameter air injection device, is used for the welding of different diameter non -ferrous metal pipe fitting, can effectively solve non -ferrous metal pipe fitting internal weld oxidation, welding joint and heat affected zone embrittlement, welding bubble and other welding defects, improve product welding first time and pass the rate of mutual inspection, improve the welding efficiency of non -ferrous metal pipe fitting, thereby reduced non -ferrous metal pipe fitting weld unqualified repair cost, and this argon filling protection device has extensive popularization and use value.

Description

Technical Field

[0001] This utility model belongs to the field of non-ferrous metal pipe welding technology, specifically relating to an argon gas protection device for the inner ring weld of a pipe, used for the formation of the internal weld of non-ferrous metal pipe fittings, DC TIG or consumable electrode inert gas shielded welding, and is particularly suitable for welding pressure vessels with weld grades of level II or above. Background Technology

[0002] When welding non-ferrous metal pipelines and pressure vessels, all welds use V-grooves, with single-sided welding and double-sided forming. Currently, all welds are protected by tungsten inert gas (TIG) welding or metal inert gas (MIG) welding. The weld on the back of the vessel must be adequately protected by inert gas to ensure its quality; otherwise, oxidation, embrittlement, slurry bleeding, and porosity will occur, affecting the welding quality. Therefore, based on the welding environment and working conditions, an argon-filling protection device needs to be designed to protect the gas inside the vessel. Existing argon-filling protection devices for pipelines or gas cylinders mainly use conical rubber plugs with a central hole for the filling pipe. During welding, the other end of the pipe must be sealed with tin foil, and the welded area at the pipe joint must be sealed with high-temperature resistant tape to prevent inadequate gas protection. The welding process is relatively complex, and after the tape is torn off, the adhesive residue must be cleaned to avoid weld contamination. The operation is cumbersome, and the weld protection effect is inconsistent. Utility Model Content

[0003] This utility model provides an argon gas protection device for the inner ring weld of a pipeline, which solves welding defects such as oxidation, embrittlement, weld slurry, and welding porosity in the internal weld and heat-affected zone of non-ferrous metal pipe fittings, improves the first-pass yield of welded products, and increases the welding efficiency of non-ferrous metal pipe fittings.

[0004] To solve the above technical problems, this utility model provides an argon gas protection device for the inner circumferential weld of a pipeline, characterized in that: it includes a quick connector (1), a telescopic tube (2), a positioner (3), and a jetting device (4); a V-shaped annular groove is provided on the outer circumference of the jetting device (4), and multiple dense holes connected to the telescopic tube (2) are provided on the annular groove; one end of the telescopic tube (2) passes through the inside of the positioner (3) and is threadedly connected to the jetting device (4), and the argon cylinder is connected to the other end of the telescopic tube (2) through the quick connector (1).

[0005] Furthermore, the telescopic tube (2) is an antenna-shaped air intake tube with telescopic function.

[0006] Furthermore, the telescopic tube has a multi-section tension structure.

[0007] Furthermore, the jet device (4) is a brass annular structure with a threaded hole in the center.

[0008] Furthermore, the diameter of the jet device (4) is interchangeable.

[0009] Furthermore, the jetting device (4) is installed inside the pipe that needs to be welded.

[0010] Furthermore, it also includes an adjustable V-bracket (6) for supporting pipes that need to be welded.

[0011] Furthermore, the jet device is filled with steel wire.

[0012] Furthermore, the dense perforations of the jet device are aligned with the V-shaped bevel of the pipe-like parts.

[0013] Furthermore, it can be used for argon gas protection of the inner ring weld of gas cylinders.

[0014] Beneficial effects: This utility model uses a positioner as a clamping device for pipes or gas cylinders. A hole is drilled in the center of the positioner's three-jaw chuck, and a telescopic tube is installed. The telescopic tube is a multi-section stretchable type. Gas is uniformly input by connecting it to the jet device through a three-way pipe. The surface of the V-shaped dense hole ring jet device is filled with steel wire.

[0015] This utility model is a replaceable brass annular jetting device with V-shaped dense holes on the surface of different diameters, which can be used for welding non-ferrous metal pipes of different diameters. It can effectively solve welding defects such as internal weld oxidation, embrittlement of weld joints and heat-affected zones, and welding bubbles in non-ferrous metal pipes, improve the first-pass yield of welded products, increase the welding efficiency of non-ferrous metal pipes, and thus reduce the cost of rework for non-ferrous metal pipe weld defects. This argon-filled protection device has wide application value. Attached Figure Description

[0016] Figure 1 Schematic diagram of the structure of this utility model

[0017] Figure 2 This is a disassembled diagram of a V-shaped, densely perforated annular jet device. Detailed Implementation

[0018] To make the purpose, content and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below.

[0019] The present invention proposes an argon gas protection device for the inner ring weld of a pipeline, comprising a quick connector (1), a telescopic pipe (2), a positioner (3), a jetting device (4), a base plate (5), and an adjustable V-shaped frame (6);

[0020] The telescopic tube (2) is an antenna-shaped air intake tube with telescopic function;

[0021] The jet device (4) is a brass ring structure with a threaded hole in the center. The diameter is interchangeable. A V-shaped ring groove is provided on the outer circumference of the jet device (4). The ring groove has multiple dense holes that communicate with the telescopic pipe (2). The jet device (4) is installed inside the pipe that needs to be welded.

[0022] Weld the positioner (3) and the adjustable V-frame (6) onto the base plate (5), drill a hole in the center of the positioner (3), pass one end of the telescopic tube (2) through the inside of the positioner (3) and connect it to the jet device (4) by thread. Connect the argon cylinder inlet hose to the other end of the telescopic tube (2) through the quick connector (1) and it is ready for use.

[0023] Place the pipe or gas cylinder to be welded in the V-shaped support groove of the adjustable V-frame (6), and set the jetting device (4) inside the pipe to be welded. Adjust the height of the adjustable V-frame (6) to keep the pipe coaxial with the positioner. Adjust the telescopic tube and align the dense hole of the jetting device with the V-shaped bevel of the gas cylinder or pipe part. Use the three-jaw chuck of the positioner to fix the end of the part. At this time, turn on the argon cylinder switch and adjust the gas flow rate to 10-15L / min. Argon gas flows from the inlet pipe into the V-shaped dense hole of the annular jetting device. The gas is then sprayed out to form a protective gas barrier. At this time, the welding positioner is turned on to rotate the pipe. TIG welding is used for the root pass. The melting speed of the TIG welding on the base material and the rotation speed of the positioner are adjusted. The positioner is used to keep the pipe in a flat welding position, which is beneficial to the welding operation. The welding equipment is a WSME-500 AC / DC TIG welder, the welding gun is 300A, and the welding wire is selected according to the material being welded. There is no need to stick high-temperature tape or tin foil on the end during the welding process. The inner wall of the weld is fully protected by gas.

[0024] Key features of this utility model:

[0025] 1. The original welding positioner was modified into an antenna-shaped air intake pipe with a telescopic function and a brass annular jet device with a replaceable diameter and a V-shaped groove with dense holes.

[0026] 2. This jet protection device can replace jet rings of different diameters according to the pipe diameter. The protective gas is evenly distributed through three 120° air inlet pipes and then enters the annular jet device for spraying out. The protection effect is direct. The key V-shaped dense hole annular jet device can also avoid the weld seam on the inner wall of the pipe, preventing molten metal from sticking to the gas protection device. At the same time, the V-shaped jet device makes the gas more concentrated and less affected by the airflow at the end of the pipe.

[0027] The design scheme of the argon gas protection device for the inner ring weld of the pipeline is a telescopic surface V-shaped dense-hole brass annular jet device. Before welding, the device is extended or shortened according to the position of the pipeline weld. The surface V-shaped dense-hole annular jet device is extended to the weld position, the pipeline end is pressed against the end of the three-jaw chuck, and the three-jaw chuck is tightened to lock the pipeline or gas cylinder. By opening the argon cylinder switch, the gas enters the jet protection device through the gas pipe outside the chuck. At this time, the gas enters the annular ring and is evenly distributed and sprayed out through the filling material to form a gas protection barrier. At this time, the inner wall weld of the pipeline is fully protected by inert gas during external welding, avoiding weld oxidation.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An argon gas protection device for the inner circumferential weld of a pipeline, characterized in that: It includes a quick connector (1), a telescopic tube (2), a positioner (3), and a jet device (4); a V-shaped annular groove is provided on the outer circumference of the jet device (4), and multiple dense holes connected to the telescopic tube (2) are provided on the annular groove; one end of the telescopic tube (2) passes through the interior of the positioner (3) and is threadedly connected to the jet device (4), and the argon cylinder is connected to the other end of the telescopic tube (2) through the quick connector (1).

2. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The telescopic tube (2) is an antenna-shaped air intake tube with telescopic function.

3. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The telescopic tube has a multi-section tension structure.

4. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The jet device (4) is a brass ring structure with a threaded hole in the center.

5. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The diameter of the jet device (4) is interchangeable.

6. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The jetting device (4) is installed inside the pipe that needs to be welded.

7. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: It also includes an adjustable V-bracket (6) for supporting pipes that need to be welded.

8. The argon gas protection device for the inner circumferential weld of a pipeline according to claim 1, characterized in that: The jet device is filled with steel wire.

9. An argon gas protection device for the inner circumferential weld of a pipeline according to any one of claims 1-8, characterized in that: The dense perforations of the jet device are aligned with the V-shaped bevel of the pipe-like parts.

10. An argon gas protection device for the inner circumferential weld of a pipeline according to any one of claims 1-8, characterized in that: It can be used for argon gas protection of the inner ring weld of gas cylinders.

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