Titanium alloy laser arc hybrid welding following welding protection device

Abstract

The utility model relates to a titanium alloy laser electric arc hybrid welding following welding protection device which comprises a front face gas protection device and a back face gas protection device. The front face gas protection device comprises a front protection cover and a rear protection cover, the front protection cover and the rear protection cover are connected through a middle connecting device, arc partition plates used for dividing gas flow are arranged in the front protection cover and the rear protection cover respectively, inner cavities of the front protection cover and the rear protection cover are divided into a plurality of small cavities through the arc partition plates, and each small cavity is provided with a threaded hole used for introducing argon. When in use, the structure can ensure effective access and circulation of argon to form a certain gas concentration, so as to play a role in protecting a welding seam, prevent the welding seam from being oxidized and improve the welding quality. Meanwhile, the application range is wide, and popularization and utilization are convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of laser-arc hybrid welding, specifically to a welding protection device for laser-arc hybrid welding of titanium alloys. Background Technology

[0002] In the existing technology, titanium alloys have been widely used in aerospace, medical, automotive, military, petrochemical and nuclear industries due to their many unique and excellent properties, such as high tensile strength, good high and low temperature performance, corrosion resistance and high specific strength and specific stiffness.

[0003] With the widespread application of titanium alloys, their welding problems have become increasingly prominent. At high temperatures, titanium alloys readily absorb gases such as nitrogen, hydrogen, and oxygen from the air. These gases react with the titanium alloy to form brittle phases, severely affecting the quality of the welded joint. Laser welding offers advantages such as high welding speed, a small heat-affected zone, and aesthetically pleasing weld formation. Furthermore, laser-arc hybrid welding technology, by incorporating welding wires of different materials, can improve the microstructure and composition of the weld, thereby enhancing joint performance.

[0004] Typically, laser-arc hybrid welding technology, due to the addition of an arc heat source, has a higher heat input and faster welding speed compared to autogenous welding. This increases the risk of the molten pool coming into contact with air. Titanium alloys have low thermal conductivity and slow heat dissipation, resulting in a large heat-affected zone on both the front and back sides of the weld requiring gas shielding. Commonly used single-pipe gas blowing devices offer poor protection, while drag-type gas shielding devices are cumbersome.

[0005] Therefore, there is an urgent need to design a welding gas protection device that is simple in structure, has good welding quality, and is easy to install and use. Summary of the Invention

[0006] The purpose of this invention is to provide an improved welding protection device for titanium alloy laser-arc composite welding. Through structural improvements, it achieves effective gas protection for both the front and back of the weld, resulting in titanium alloy laser-welded joints with excellent mechanical properties.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: A welding protection device for titanium alloy laser-arc composite welding, used for welding titanium alloy plates, characterized in that: the welding protection device includes a front gas protection device and a back gas protection device; the front gas protection device includes a front protective cover and a rear protective cover, which are connected by an intermediate connecting device; the front and rear protective covers are respectively provided with arc-shaped baffles for dividing the gas flow, and the arc-shaped baffles divide the inner cavity of the front and rear protective covers into several small cavities, each of which is provided with a threaded hole for connecting argon gas.

[0008] Preferably, the front protective cover has a laser circular hole on one side and a front base plate at the bottom. The front base plate has evenly distributed front vent holes, and a groove on one side of the front base plate is used to install a high-temperature resistant strip.

[0009] Furthermore, the rear protective cover and the intermediate connecting device are rotatably connected. One end of the rear protective cover is provided with an arc structure that cooperates with the intermediate connecting device. The bottom of the rear protective cover is provided with a rear base plate, and rear air vents are evenly distributed on the rear base plate. The side of the rear protective cover is provided with a groove for installing a high-temperature resistant strip.

[0010] Furthermore, the back gas protection cover includes a tooling base, on which an air blowing chamber is provided, and on both sides of the air blowing chamber are back gas protection air inlets, and the back gas protection air outlets are evenly distributed in the groove.

[0011] Furthermore, the intermediate connecting device is provided with a welding torch through hole and a sliding groove for connecting the front and rear protective covers. The intermediate connecting device is used to fix the welding torch.

[0012] Furthermore, the front and rear protective covers are equipped with locking strips that mate with the sliding grooves, and several small cavities inside the front and rear protective covers are interconnected at the bottom. Both the front and rear protective covers are made of aluminum alloy.

[0013] Compared with the prior art, the technical solution of this utility model not only improves the overall technical solution, but also includes many detailed improvements. Specifically, it has the following beneficial effects:

[0014] 1. The improved solution of this utility model includes a front gas protection device and a back gas protection device for welding. The front gas protection device includes a front protective cover and a rear protective cover. The front and rear protective covers are connected by an intermediate connecting device, which can achieve effective gas protection for the front and back of the weld, avoid weld oxidation, and improve welding quality.

[0015] 2. In the technical solution of this utility model, the front and rear protective covers are respectively provided with arc-shaped baffles for dividing the airflow. The arc-shaped baffles divide the inner cavity of the front and rear protective covers into several small cavities. Each small cavity is provided with a threaded hole for receiving argon gas, which can ensure the effective reception and flow of argon gas, form a certain gas concentration, and play a role in protecting the weld.

[0016] 3. In the structure of this utility model, the rear protective cover and the intermediate connecting device are rotatably connected. The intermediate connecting device is provided with a welding gun through hole and a sliding groove for connecting the front and rear protective covers. The intermediate connecting device is used to fix the welding gun. The rotatable intermediate connecting device makes the application scope of this utility model wider. At the same time, since the welding gun is fixed to the intermediate connecting device, it can be used for automated welding processes.

[0017] 4. This utility model has a simple structure, reasonable layout, is easy to use, has a wide range of applications, and is easy to promote and utilize. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the usage state of this utility model.

[0019] Figure 2 This is a schematic diagram of the front gas protection device of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the back gas protection device of this utility model.

[0021] Figure 4 This is a schematic diagram of the dispersed structure of the front protective cover of this utility model.

[0022] Figure 5 This is a schematic diagram of the intermediate connecting device of this utility model.

[0023] Figure 6 This is a schematic diagram of the dispersed structure of the rear protective cover of this utility model.

[0024] Figure label:

[0025] 1. Front protective cover, 2. Intermediate connecting device, 3. Rear protective cover, 4. Rear gas protection device, 5. Titanium alloy plate, 6. Front gas protection device, 7. Tooling base, 8. Tooling base is provided with air blowing chamber, 9. Rear gas protection inlet, 10. Rear gas protection outlet.

[0026] 11. Arc-shaped partition, 12. Threaded hole, 13. Laser-cut round hole, 14. Front base plate, 15. Front vent, 16. Groove;

[0027] 21 Welding torch through hole;

[0028] 31 Rear bottom plate, 32 Rear air vent. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] This utility model provides a welding protection device for laser-arc hybrid welding of titanium alloys, used for welding titanium alloy plates. See details below. Figure 1The difference between it and the prior art is that the welding protection device includes a front gas protection device 6 and a back gas protection device 4; the front gas protection device includes a front protective cover 1 and a rear protective cover 3, which are connected by an intermediate connecting device 2. The front and rear protective covers are respectively provided with arc-shaped baffles for dividing the gas flow. The arc-shaped baffles divide the inner cavity of the front and rear protective covers into several small cavities, and each small cavity is provided with a threaded hole for connecting argon gas.

[0031] During use, the titanium alloy plate to be welded is clamped above the back gas shielding device. The back gas shielding device remains stationary, while the front gas shielding device moves with the welding torch to provide real-time protection for the weld. The front gas shielding device consists of front and rear protective covers and an intermediate connecting device, forming a whole that can effectively protect the front and back of the weld with gas, preventing weld oxidation and improving welding quality.

[0032] Example 1

[0033] In this embodiment, the welding protection device includes a front gas protection device 6 and a back gas protection device 4. The double-sided gas protection device improves weld quality. The front gas protection device includes a front protective cover 1 and a rear protective cover 3, connected by an intermediate connecting device 4 to form a movable connection, thus expanding the coverage of the front gas protection device. The front and rear protective covers are each equipped with an arc-shaped baffle 11 for dividing the gas flow. The arc-shaped baffle divides the inner cavity of the front and rear protective covers into several small cavities, each of which has a threaded hole 12 for receiving argon gas.

[0034] Specifically, the front protective cover has a laser aperture 13 on one side for the laser to pass through, a front base plate 14 at the bottom with evenly distributed front vent holes 15, and a groove 16 on one side for installing a high-temperature resistant strip. The rear protective cover is rotatably connected to the intermediate connecting device. One end of the rear protective cover has an arc structure that mates with the intermediate connecting device. The bottom of the rear protective cover has a rear base plate 31 with evenly distributed rear vent holes 32, and a groove on the side of the rear protective cover for installing a high-temperature resistant strip. The rear protective cover and the intermediate connecting mechanism are adjustable in angle from 10° to 60° to adapt to changes in the welding torch angle, ensuring the protective cover remains horizontal with the titanium alloy plate surface.

[0035] Furthermore, the rear air protection cover includes a tooling base 7, on which an air blowing chamber 8 is provided. Air inlets 9 are located on both sides of the air blowing chamber, and air outlets 10 are evenly distributed within the groove. Both the front and rear protective covers are made of aluminum alloy, while the front and rear base plates are made of copper, with 1mm diameter circular holes for the front and rear air outlets distributed on them.

[0036] The intermediate connecting device has a welding torch through hole 21 and a sliding groove for connecting the front and rear protective covers. The intermediate connecting device is used to fix the welding torch. The front and rear protective covers are provided with retaining strips that cooperate with the sliding grooves. Several small cavities inside the front and rear protective covers are interconnected at the bottom.

[0037] During implementation, argon gas was used, with a gas flow rate of 15-30 L / min for the front protection device and 5-15 L / min for the back protection device. After the titanium alloy plates to be welded were assembled, the back gas protection device was vented for 3 minutes to purge the air from the back gas protection shield.

[0038] Example 2

[0039] In this embodiment, the welding protection device includes a front gas protection device and a back gas protection device; the front gas protection device includes a front protective cover and a rear protective cover, which are connected by an intermediate connecting device. The front and rear protective covers are respectively provided with arc-shaped baffles for dividing the gas flow. The arc-shaped baffles divide the inner cavity of the front and rear protective covers into several small cavities, and each small cavity is provided with a threaded hole for connecting argon gas.

[0040] Specifically, the front protective cover is 150mm long, the diameter of the through hole of the intermediate connecting device is 2mm larger than the diameter of the selected welding torch, and the rear protective cover is 500mm long. The front protective cover, intermediate connecting device, and rear protective cover are connected by a side groove with a length of 30mm.

[0041] In use, the protective cover is 5-15mm above the titanium alloy plate surface, and the high-temperature resistant strip directly contacts the titanium alloy plate surface, forming a sealed cavity. Preferably, in the aforementioned titanium alloy laser-arc composite welding protective device, the width of the air blowing chamber of the back gas protective cover is three times the width of the area to be welded, and the length is equal to the length of the area to be welded. The back protective device directly contacts the titanium alloy test plate.

[0042] The following example illustrates laser wire welding of a butt joint of TA15 titanium alloy with dimensions of 300mm × 100mm × 4mm.

[0043] 1) The titanium alloy plates to be welded are spot welded together, and the surface is polished with a wire brush and then wiped with alcohol to remove surface oil stains.

[0044] 2) Place the prepared titanium alloy plate on the back protective fixture, with the area to be welded located above the cavity of the back protective fixture. Clamp and fix the titanium alloy plate with a quick clamp.

[0045] 3) Open the back protective gas switch, adjust the gas flow rate to 10L / min, and ventilate for three minutes to purge the air from the back protective device;

[0046] 4) Control the robot to move to the starting and ending points of the welding process, and determine the welding path through teaching.

[0047] 5) After adjustment, the protective cover is kept horizontal with the titanium alloy surface, and the high-temperature resistant strip is in direct contact with the surface of the titanium alloy plate to form a sealed cavity;

[0048] 6) Set the welding process parameters, including laser power 6KW, welding speed 0.8m / min, wire feed speed 8m / min, defocusing amount +5mm, wire spacing 3mm, welding current 180A, welding voltage 26V, arc in front and laser behind along the welding direction, and the welding shielding gas is an argon-helium mixture with a helium volume fraction of 8%; the shielding gas flow rate is 20L / min.

[0049] Complete the welding according to the welding trajectory set in step 4; the front and back of the TA15 titanium plate weld are both silver-white, without undercut, and have excellent mechanical properties.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A welding protection device for laser-arc hybrid welding of titanium alloys, used for welding titanium alloy plates, characterized in that: Welding protection devices include front gas protection devices and back gas protection devices; The front gas protection device includes a front protective cover and a rear protective cover, which are connected by an intermediate connecting device. The front and rear protective covers are respectively provided with arc-shaped baffles for dividing the airflow. The arc-shaped baffles divide the inner cavity of the front and rear protective covers into several small cavities, and each small cavity is provided with a threaded hole for connecting argon gas.

2. A device for protecting a titanium alloy laser-arc hybrid weld as it is made according to claim 1, wherein: The front protective cover has a laser circular hole on one side and a front base plate at the bottom. The front base plate has evenly distributed front vent holes, and a groove on one side of the front base plate is used to install a high-temperature resistant strip.

3. The welding protection device for titanium alloy laser-arc composite welding according to claim 1, characterized in that: The rear protective cover and the intermediate connecting device are rotatably connected. One end of the rear protective cover is provided with an arc structure that matches the intermediate connecting device. The bottom of the rear protective cover is provided with a rear base plate, and rear air vents are evenly distributed on the rear base plate. The side of the rear protective cover is provided with a groove for installing a high-temperature resistant strip.

4. A device for protecting a titanium alloy laser-arc hybrid weld from oxidation during welding, according to claim 1, wherein: The back air protection cover includes a tooling base, an air blowing chamber on the tooling base, back air protection air inlets on both sides of the air blowing chamber, and back air protection air outlets evenly distributed in the groove.

5. The welding protection device for titanium alloy laser-arc composite welding according to claim 1, characterized in that: The intermediate connecting device is provided with a welding torch through hole and a sliding groove for connecting the front and rear protective covers. The intermediate connecting device is used to fix the welding torch.

6. A device for protecting a titanium alloy laser-arc hybrid weld as it is made according to claim 5, wherein: The front and rear protective covers are equipped with locking strips that cooperate with the sliding grooves, and several small cavities inside the front and rear protective covers are interconnected at the bottom.

7. A device for protecting a titanium alloy laser-arc hybrid weld from oxidation during welding, according to claim 1, wherein: Both the front and rear protective covers are made of aluminum alloy.

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