Loop flange welding gas protection device

Abstract

The utility model discloses a lap joint flange welding gas protection device. The device comprises a gas protection bin capable of containing a lap joint flange, a gas dispersion device arranged in the gas protection bin and a hatch cover which is arranged on the gas protection bin and can rotate, and a protection gas inlet matched with the gas dispersion device is formed in the gas protection bin. An opening used for enabling the argon arc welding gun to stretch into the gas protection bin is formed in the bin cover, the lap joint flange is arranged in the gas protection bin and can enable the welding position to be located at the gas dispersion device, and the argon arc welding gun can stretch into the gas protection bin to weld the welding position and can change the welding position through rotation of the bin cover. The device has the advantages that the device is very simple and convenient to operate and use, low in welding labor cost and high in welding efficiency, the flow of protective gas can be reduced through the gas dispersing device ingeniously arranged in the gas protective bin, gas loss is effectively reduced, and the purpose of saving the using amount of the protective gas is achieved.

Description

Technical Field

[0001] The utility model relates to a welding auxiliary device for a pipe flange, in particular to a gas protection device for welding a slip-on flange. Background Art

[0002] For special materials such as titanium and zirconium, the pipe flange of the equipment generally adopts a slip-on flange structure, that is, the slip-on part is composed of an inner pipe and a sealing turn-over, and these two parts are connected into a whole by internal and external welding to form fillet welds inside and outside. However, when welding internal and external fillet welds, the welds are easily oxidized, which requires the use of inert gas for protection during the welding process. The gas protection of fillet welds, especially the gas protection when welding the flange slip-on flange, is the most difficult to achieve.

[0003] The conventional operation method for this type of fillet weld protection is to make a protective cover that is the same as the R arc of the weld, and two assistants in front and behind cooperate with the welder to complete the welding task. Due to the different sizes of the pipe and the veneer, there are many types of protective covers and the cost is high. In addition, the protective gas is lost quickly during the welding process, which is a serious waste. The welding process requires three people to reasonably complete the labor cost, which is high and inefficient. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a gas protection device for reducing slip-on flange welding which is easy to operate and can effectively reduce gas loss, has low welding cost and high welding efficiency.

[0005] In order to solve the above technical problems, the utility model discloses a gas protection device for slip-on flange welding, comprising a gas protection chamber capable of accommodating a slip-on flange, a gas dispersion device arranged in the gas protection chamber, and a hatch cover arranged on the gas protection chamber and capable of rotating. The gas protection chamber is provided with a protective gas inlet cooperating with the gas dispersion device, and the hatch cover is provided with an opening for allowing an argon arc welding gun to extend into the gas protection chamber. The slip-on flange is arranged in the gas protection chamber and can position the welding at the gas dispersion device. The argon arc welding gun can extend into the gas protection chamber to weld at the welding position and can change the welding position by rotating the hatch cover.

[0006] The hatch cover is mounted on the gas protection chamber through a bearing.

[0007] The hatch cover is a transparent hatch cover.

[0008] The transparent hatch cover is made of a transparent acrylic plate.

[0009] The gas dispersion device is a wire mesh facing the protective gas inlet.

[0010] The protective gas inlet is arranged at the bottom of the gas protection chamber, the inner tube of the slip-on flange is placed at the periphery of the protective gas inlet, and the gas dispersion device is arranged in the inner tube of the slip-on flange.

[0011] The gas dispersion device is an annular tube which is directly opposite to the protective gas inlet and has a gas outlet.

[0012] The protective gas inlet is arranged on the side of the gas protection chamber, and the welding position of the slip-on flange is located in the annular tube.

[0013] A support platform for supporting the slip-on flange is arranged in the gas protection chamber, and the slip-on flange can be supported by the support platform so that the welding position is located in the annular tube.

[0014] After adopting the above structure, the slip-on flange to be welded is placed in a gas protection chamber, and the gas dispersion device is used to evenly fill the shielding gas around the weld to form gas protection, and then the chamber is filled with shielding gas, and finally all-round protection is achieved. When in use, a transparent hatch cover that can be rotated is set on the gas protection chamber, which is not only very simple and convenient to operate, but also has low welding labor costs and high welding efficiency. Moreover, the gas dispersion device cleverly arranged in the gas protection chamber can reduce the flow of shielding gas and effectively reduce gas loss, thereby achieving the purpose of saving the amount of shielding gas. In addition, by designing different gas dispersion devices, two sets of tooling with different usage methods are formed, one for welding protection of the inner corner weld of the slip-on flange, and the other for welding protection of the outer corner weld of the slip-on flange, which further improves the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the slip-on flange welding gas protection device of the present invention in conjunction with the accompanying drawings and specific implementation methods. Embodiment 1:

[0018] As shown in the figure, the slip-on flange welding gas protection device of this embodiment is used for welding protection of the internal fillet weld of the slip-on flange.

[0019] It includes a gas protection chamber 2 capable of accommodating a slip-on flange 1, a gas dispersion device 3 arranged in the gas protection chamber, and a hatch cover 4 rotatably arranged on the gas protection chamber, the gas protection chamber 2 is provided with a shielding gas inlet 5 cooperating with the gas dispersion device, the hatch cover 4 is provided with an opening 7 for allowing an argon arc welding gun 6 to extend into the gas protection chamber. As can be seen from the figure, in this embodiment, the shielding gas inlet 5 is arranged at the bottom of the gas protection chamber 2, the inner tube of the slip-on flange 1 is placed on the periphery of the shielding gas inlet 5, the gas dispersion device 3 is a wire mesh arranged in the inner tube of the slip-on and facing the shielding gas inlet 5, thereby the slip-on flange 1 is arranged in the gas protection chamber and the welding position can be located at the gas dispersion device 3, the argon arc welding gun 6 can extend into the gas protection chamber through the opening 7 to weld the welding position and the welding position can be changed by rotating the hatch cover.

[0020] Furthermore, the hatch cover 4 is mounted on the gas shielding chamber 2 by means of the bearing 8, so that the hatch cover can be mounted on the gas shielding chamber by means of the bearing to achieve the purpose of free rotation relative to the gas shielding chamber, that is, with the help of the bearing, the argon arc welding gun can be rotated as the welding position changes, facilitating the welding of the inner fillet weld in the entire circumferential direction.

[0021] The hatch cover 4 is a transparent hatch cover made of a transparent acrylic plate.

[0022] When welding the inner fillet weld, place the slip-on flange to be welded in the gas protection chamber, start the gas filling device, and the gas passes through the wire mesh to evenly fill the protective gas around the weld to form gas protection. The chamber is then filled with protective gas to protect the outside of the weld, ultimately achieving an all-round protection effect. Embodiment 2:

[0023] As shown in the figure, the slip-on flange welding gas protection device of this embodiment is used for welding protection of the outer corner weld of the slip-on flange. Its structural design is roughly the same as that of the first embodiment, except that the protective gas inlet 5 is arranged on the upper side of the gas protection chamber 2, and the gas dispersion device 3 is an annular tube arranged in the gas protection chamber 2 facing the protective gas inlet 5 and having air outlet holes (that is, the annular tube is evenly distributed with air holes), and a support platform 9 for supporting the slip-on flange is arranged in the gas protection chamber 2. The slip-on flange 1 can be supported by the support platform so that the welding position is in the annular tube.

[0024] When welding the outer weld, in order to further reduce gas loss, a support table is placed in the gas protection chamber to raise the welding position and reduce the inflation space. The shielding gas is filled around the weld from the side through a ring-shaped tube with air outlet holes. The chamber is then filled with shielding gas to protect the outside of the weld, ultimately achieving all-round protection.

[0025] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A gas protection device for slip-on flange welding, characterized in that: The invention comprises a gas protection chamber (2) capable of accommodating a slip-on flange (1), a gas dispersion device (3) arranged in the gas protection chamber, and a hatch cover (4) arranged on the gas protection chamber and capable of rotating. The gas protection chamber (2) is provided with a protective gas inlet (5) cooperating with the gas dispersion device. The hatch cover (4) is provided with an opening (7) for allowing an argon arc welding gun (6) to extend into the gas protection chamber. The slip-on flange (1) is arranged in the gas protection chamber and can position the welding at the gas dispersion device (3). The argon arc welding gun (6) can extend into the gas protection chamber to weld at the welding position and can change the welding position by rotating the hatch cover.

2. The gas protection device for slip-on flange welding according to claim 1 is characterized in that: The hatch cover (4) is mounted on the gas protection chamber (2) via a bearing (8).

3. The gas protection device for slip-on flange welding according to claim 1 or 2, characterized in that: The hatch cover (4) is a transparent hatch cover.

4. The gas protection device for slip-on flange welding according to claim 3 is characterized in that: The transparent hatch cover is made of a transparent acrylic plate.

5. The gas protection device for slip-on flange welding according to claim 1, 2 or 4, characterized in that: The gas dispersion device (3) is a wire mesh facing the protective gas inlet (5).

6. The gas protection device for slip-on flange welding according to claim 5 is characterized in that: The protective gas inlet (5) is arranged at the bottom of the gas protection chamber (2), the inner tube of the slip-on flange (1) is placed outside the protective gas inlet (5), and the gas dispersion device (3) is arranged in the inner tube of the slip-on flange.

7. The gas protection device for slip-on flange welding according to claim 1, 2 or 4, characterized in that: The gas dispersion device (3) is an annular tube facing the protective gas inlet (5) and having a gas outlet.

8. The gas protection device for slip-on flange welding according to claim 7 is characterized in that: The protective gas inlet (5) is arranged on the side of the gas protection chamber (2), and the welding position of the slip-on flange (1) is located inside the annular tube.

9. The gas protection device for slip-on flange welding according to claim 8, characterized in that: A support platform (9) for supporting the slip-on flange is arranged in the gas protection chamber (2); the slip-on flange (1) can be welded in the annular tube by being supported by the support platform.

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