Protective gas supply device for auxiliary welding and welding method

Abstract

The invention discloses a protective gas supply device for auxiliary welding and a welding method. The technical problems that in the prior art, the welding quality is not stable, and the device is difficult to apply to complex welding scenes are mainly solved. The device comprises an air supply unit and a clamping unit, the air supply unit comprises an air groove, an air guide plate and an air guide pipe; the air guide plate is mounted at the opening end of the air groove and encloses a cavity with the air groove; the air guide pipe is mounted on the side wall of the air groove and is communicated with the cavity; the end, away from the gas groove, of the gas guide pipe is used for being connected with an external gas source and filling protective gas into the cavity. A plurality of vent holes are formed in the air guide plate; the clamping unit comprises a first clamping module and a second clamping module; the first clamping module and the second clamping module are arranged in parallel, and one ends of the first clamping module and the second clamping module are connected with the side, away from the gas guide plate, of the gas groove correspondingly and used for placing and abutting the gas supply unit to the to-be-welded part. Meanwhile, the invention further provides a welding method based on the device, operation is convenient and fast, and the welding quality is high.

Description

Technical Field

[0001] The invention relates to a gas supply device, and in particular to a protective gas supply device for auxiliary welding and a welding method. Background Art

[0002] Gas shielded welding technology is widely used in the welding of steel, aluminum and other metals. It mainly relies on inert or active gases (such as argon, carbon dioxide, etc.) to prevent the molten pool from contacting oxygen and nitrogen in the air, thereby avoiding welding defects such as oxidation, slag inclusions, and porosity. However, the existing gas shielded welding technology is very sensitive to environmental conditions. Especially in outdoor or ventilated environments, the shielding gas is easily blown away, resulting in a weakened gas shielding effect and unstable weld quality. In addition, there are many parts that are difficult to access during welding operations, such as the inner wall of the pipe and narrow areas. It is difficult for the shielding gas to cover accurately, which increases the difficulty of the welding operation.

[0003] The existing technology improves the above problems by adopting methods such as artificial shielding, using wind shielding devices or slowing down the welding speed. However, the improvement effect of such methods is not obvious, and there are still problems such as unstable welding quality, and it is difficult to apply to complex welding scenes. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of the prior art such as unstable welding quality and difficulty in application in complex welding scenes, and to provide a protective gas supply device and a welding method for auxiliary welding.

[0005] To achieve the above objectives, the technical solutions provided by the present invention are:

[0006] A shielding gas supply device for auxiliary welding, characterized in that it comprises a gas supply unit and a clamping unit;

[0007] The gas supply unit includes an air groove, an air guide plate and an air guide pipe; the air guide plate is installed at the open end of the air groove and forms a cavity with the air groove; the air guide pipe is installed on the side wall of the air groove and communicates with the cavity; one end of the air guide pipe away from the air groove is used to connect to an external gas source and flush the protective gas into the cavity; a plurality of vents are provided on the air guide plate for dispersing the protective gas in the cavity;

[0008] The clamping unit includes a first clamping module and a second clamping module; the first clamping module and the second clamping module are arranged in parallel, and one end thereof is respectively connected to a side of the air groove away from the air guide plate, so as to place and abut the air supply unit against the part to be welded.

[0009] Furthermore, the air groove is an arc-shaped structure, and the air guide plate is an arc-shaped plate adapted to the arc-shaped structure and is located on the outer arc surface of the arc-shaped structure.

[0010] Furthermore, the first clamping module and the second clamping module have the same structure;

[0011] The first clamping module includes a fixed component and a movable component; the fixed component includes a fixed rod and a first wedge-shaped block installed at one end of the fixed rod, and a side of the first wedge-shaped block away from its inclined surface is connected to a side of the air groove away from the air guide plate;

[0012] The movable component includes a movable rod and a second wedge block installed at one end of the movable rod; the movable rod is arranged parallel to the fixed rod and is movably connected to the fixed rod through a plurality of fixing pins; the second wedge block is located on the side of the first wedge block away from the air groove; the first wedge block and the second wedge block are arranged in opposite directions, and the sides with the inclined surfaces are opposite to each other.

[0013] Furthermore, the movable rod is a screw rod, and a rotating part is installed at one end of the movable rod away from the second wedge block; multiple fixed pins are installed on the same side of the fixed rod, and each fixed pin is provided with a thread compatible with the screw rod; the movable rod passes through each fixed pin in turn and is movably connected to the second wedge block.

[0014] Furthermore, the rotating member is a butterfly nut.

[0015] Furthermore, the movable rod is a straight rod, and a locking piece is provided at one end of the movable rod away from the second wedge block; a plurality of fixing pins are installed on the same side of the fixing rod, and the movable rod passes through each fixing pin in turn and is fixedly connected to the second wedge block.

[0016] Furthermore, the thickness of the gas groove is 12 to 15 mm, which is suitable for auxiliary welding in narrow spaces;

[0017] The vent hole is a circular hole with a hole diameter of 1 to 2 mm.

[0018] Furthermore, it also includes a balance rod, which is installed at both ends of the side wall of the same side of the gas groove as the air guide pipe, so as to ensure that the gas supply unit can be stably placed on the part to be welded.

[0019] At the same time, the present invention also provides a welding method, comprising the following steps:

[0020] Step 1, assemble the above-mentioned shielding gas supply device for auxiliary welding, and place it on one side of the workpiece to be welded, so that the air guide plate of the gas supply unit is close to the weld;

[0021] Step 2: adjusting the distance between the air guide plate and the workpiece to be welded by the clamping unit until the air guide plate fits with one side of the workpiece to be welded;

[0022] Step 3: Fill the cavity with protective gas through the air pipe, and the protective gas is released to the weld through the vent hole;

[0023] Step 4: Complete welding at the weld on the other side of the workpiece to be welded according to the preset process requirements.

[0024] Furthermore, step 2 is specifically to adjust the relative position between the movable rod and the fixed rod so that the first wedge block is relatively displaced relative to the second wedge block, and push the air groove toward the workpiece to be welded until the air guide plate fits one side of the workpiece to be welded.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The gas supply unit of the present invention includes a gas groove, a gas guide plate and a gas guide pipe, and the gas guide plate is provided with a plurality of vents. The protective gas is introduced into the cavity formed by the gas groove and the gas guide plate through the gas guide pipe, so that the protective gas is dispersed through the vents. At the same time, the first clamping module and the second clamping module can be combined to make the side of the gas supply unit provided with the gas guide plate close to the workpiece to be welded, so as to ensure that the protective gas can cover the weld of the workpiece to be welded, and there is no gas leakage, thereby ensuring the welding quality.

[0027] 2. The air groove of the present invention can be designed as an arc-shaped structure, which can ensure that the air groove fits the side wall of the product during welding of cylindrical products, thereby further improving the welding quality.

[0028] 3. The first clamping module and the second clamping module of the present invention have the same structure, wherein the first clamping module includes a fixed component and a movable component, and the relative position between the first wedge block in the fixed component and the second wedge block in the movable component can be adjusted, thereby adjusting the overall thickness of the first wedge block and the second wedge block, ensuring that the air guide plate in the air supply unit fits the workpiece to be welded, and improving the stability of the shielding gas supply.

[0029] 4. The movable rod of the present invention can be a screw rod structure or a straight rod structure, so it can be applied to different welding environments and occasions.

[0030] 5. The thickness of the gas groove of the present invention is 12 to 15 mm, which can be applied to auxiliary welding in narrow spaces, thereby ensuring welding quality.

[0031] 6. The present invention also includes a balance bar. When the gas supply unit is placed on the part to be welded, the balance bar can be used to maintain the stability of the placement process to avoid damage to the workpiece to be welded.

[0032] 7. The present invention has a simple structure and is easy to operate. It is suitable for industrial, outdoor construction and special welding scenes and has broad market application prospects.

[0033] 8. The welding method of the present invention has a simple operation process, and the position of the protective gas supply device can be flexibly adjusted manually, thereby improving the welding quality, reducing the rework rate and gas consumption, and ultimately improving the production efficiency, meeting the needs of efficient and automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0035] Figure 2 Schematic diagram of the structure of the air supply unit in an embodiment of the present invention.

[0036] Figure 3 Schematic diagram of the structure of the first wedge block and the second wedge block in the first clamping module in an embodiment of the present invention in the initial state.

[0037] Figure 4 It is a schematic structural diagram of the first wedge block and the second wedge block in the first clamping module of an embodiment of the present invention when they are separated.

[0038] Figure 5 Schematic diagram of the weld structure of the double-layer cylindrical structure in an embodiment of the present invention.

[0039] The following are the descriptions of the reference numerals:

[0040] 1-air groove, 2-air guide plate, 21-air vent, 3-air guide tube, 4-first clamping module, 41-fixing rod, 42-first wedge block, 43-movable rod, 44-second wedge block, 45-fixing pin, 5-second clamping module. DETAILED DESCRIPTION

[0041] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0042] like Figure 1 As shown, this embodiment provides a protective gas supply device for auxiliary welding, including a gas supply unit and a clamping unit. The supply device effectively solves the problem that the prior art is susceptible to environmental interference, and can ensure that the welding process is effectively carried out in an artificially created gas protection area.

[0043] like Figure 2As shown, the air supply unit includes an air groove 1, an air guide plate 2 and an air guide pipe 3; the air guide plate 2 is installed at the open end of the air groove 1 and forms a cavity with the air groove 1; the air guide pipe 3 is installed on the side wall of the air groove 1 and is connected with the cavity; the end of the air guide pipe 3 away from the air groove 1 is used to connect to an external gas source and flush the protective gas into the cavity; a plurality of air vents 21 are provided on the air guide plate 2 for dispersing the protective gas in the cavity.

[0044] The gas groove 1 can be designed as an arc structure, and the air guide plate 2 is an arc plate adapted to the arc structure and is located on the outer arc surface of the arc structure. The advantage of the arc structure design is that the shielding gas can be evenly distributed in the welding area, thereby reducing the instability of the air flow caused by the centralized gas supply. The arc structure design can cover a large area of ​​the weld area, ensuring that the welding area is always in a good protective atmosphere under external wind or other interference factors.

[0045] The thickness of the gas groove 1 can be designed to match the actual use environment. In this embodiment, the thickness is designed to be 12-15 mm, so that it can be used in narrow space welding to improve the welding quality of the weld. The gas groove 1 and the gas guide plate 2 are both made of high temperature resistant materials, which can withstand the high temperature generated during welding and ensure that the gas passes through without obstruction.

[0046] The vent hole 21 can be a circular hole, and its aperture is generally 1 to 2 mm. The shielding gas discharged from the circular hole is more uniform. Of course, the vent hole 21 can also be designed into other shapes or corresponding sizes according to actual needs to adapt it to the environment in which it is used. The shielding gas is evenly released through multiple vent holes 21, and the operator can adjust the flow rate of the shielding gas as needed to ensure the best protection effect in the weld area. Compared with traditional nozzles, this embodiment is more suitable for use in environments where the welding area is irregular or difficult to access.

[0047] Combination Figure 1 , Figure 3 and Figure 4 As shown, the clamping unit includes a first clamping module 4 and a second clamping module 5; the first clamping module 4 and the second clamping module 5 are arranged in parallel, and one end thereof is respectively connected to a side of the air groove 1 away from the air guide plate 2, so as to place and abut the air supply unit against the part to be welded.

[0048] The first clamping module 4 and the second clamping module 5 have the same structure. Generally, the two are symmetrically arranged at two ends of the air slot 1 away from the air guide plate 2, so that the clamping force on both sides of the air slot 1 is the same.

[0049] Taking the structure of the first clamping module 4 as an example, the first clamping module 4 includes a fixed component and a movable component; the fixed component includes a fixed rod 41 and a first wedge block 42 installed at one end of the fixed rod 41, and the side of the first wedge block 42 away from its inclined surface is connected to the side of the air groove 1 away from the air guide plate 2.

[0050] The movable assembly includes a movable rod 43 and a second wedge block 44 installed at one end of the movable rod 43; the movable rod 43 is arranged parallel to the fixed rod 41, and is movably connected to the fixed rod 41 through a plurality of fixing pins 45; the second wedge block 44 is located on the side of the first wedge block 42 away from the air groove 1; the first wedge block 42 and the second wedge block 44 are arranged in opposite directions, and the sides with the inclined surfaces are opposite to each other.

[0051] The movable rod 43 of this embodiment is a screw rod, which is movably connected to the second wedge block 44, and a butterfly nut is installed at one end of the movable rod 43 away from the second wedge block 44. A plurality of fixing pins 45 are installed on the same side of the fixing rod 41, and each fixing pin 45 is provided with a thread adapted to the screw rod. When in use, the butterfly nut is rotated, and the movable rod 43 is driven to rotate and move, and the movable rod 43 further drives the second wedge block 44 to move. After the second wedge block 44 moves to the corresponding position ( Figure 4 ), and stop rotating.

[0052] Alternatively, the movable rod 43 may be designed as a straight rod, and a locking piece is provided at one end of the movable rod 43 away from the second wedge block 44; a plurality of fixing pins 45 are installed on the same side of the fixed rod 41 and are movably connected to the movable rod 43, and the movable rod 43 passes through each fixing pin 45 in turn and is fixedly connected to the second wedge block 44. When in use, the movable rod 43 is pushed and pulled to drive the second wedge block 44 to move to the corresponding position, and then the movable rod 43 is locked by the locking piece, so that the movable rod 43 is relatively fixed to the fixed rod 41.

[0053] In summary, the clamping unit of this embodiment is made of high-strength and durable materials as a whole, which can fix the gas supply unit on the welding workpiece. Even if the workpiece has an irregular shape or a tricky welding angle, it can still ensure that it is stable and immovable.

[0054] In addition, the movable and fixed rods can be designed as retractable rods respectively, so as to be suitable for workpieces of different sizes and shapes. The clamping force can be adjusted according to the material thickness to ensure that the surface of the welded workpiece is not damaged.

[0055] The present embodiment further includes a balance bar, which is respectively installed at the two ends of the side wall of the same side of the gas groove 1 as the air guide pipe 3. When the gas supply unit is placed on the part to be welded, the stability of the placement process can be maintained by the balance bar to avoid damage to the workpiece to be welded.

[0056] This embodiment can also be applied in other complex working conditions, ensuring that the welding quality is maintained in a variety of harsh environments, and is widely used in outdoor construction, pipeline welding, container internal welding and other scenarios.

[0057] The present invention ensures uniform release of shielding gas through gas grooves and evenly distributed vents, and can cover a wider range of weld areas compared to traditional nozzle designs. This design can ensure the stability of shielding gas in complex or irregular welding scenarios and reduce weld defects such as oxidation and pores. At the same time, vents are used to optimize gas flow distribution, thereby reducing gas consumption and operating costs, making it suitable for outdoor or large workpiece welding.

[0058] The present invention can be used in welding processes of workpieces of various shapes and sizes, wherein the clamping unit can ensure that the gas supply unit will not shift or fall during the welding process. The device is particularly suitable for welding areas in narrow spaces, inclined surfaces or other difficult-to-access areas, and is easy to operate and can be quickly deployed to improve welding efficiency.

[0059] The device of the present invention is easy to operate, can be flexibly adjusted manually, and has the potential for automated integration in the future. Its design adapts to harsh outdoor environments, enhances the ability to resist wind interference, and reduces weld defects through stable gas protection.

[0060] Combination Figures 1 to 4 This embodiment also provides a welding method, with a double-layer steel cylinder structure ( Figure 5 Taking the welding of the two layers of cylinders as an example, the bottom of the same end of the two layers of cylinders is connected by a steel ring. Since the gap between the two layers of cylinders is very narrow, the traditional double-sided welding process cannot be implemented, so the single-sided welding double-sided forming technology is selected. During the welding process, it is necessary to ensure that there is enough protective gas in the welding area to prevent the occurrence of welding defects such as oxidation, thereby ensuring the quality and strength of the weld. The welding method includes the following steps:

[0061] Step 1: First, the inner cylinder and the steel ring are welded by conventional welding process, and then the outer cylinder is sleeved on the inner cylinder and placed on the steel ring to determine the weld position. Next, the shielding gas supply device for auxiliary welding described in this embodiment is assembled and placed in the gap between the two cylinders. At this time, the surface of the gas groove 1 and the gas guide plate 2 is arc-shaped, which is compatible with the gap between the two cylinders. When placed, one side of the gas guide plate 2 is close to the weld on the inner wall of the outer cylinder.

[0062] Step 2: By adjusting the relative position between the movable rod 43 and the fixed rod 41, the first wedge block 42 is relatively displaced with respect to the second wedge block 44, that is, the overall thickness of the first wedge block 42 and the second wedge block 44 is increased, thereby pushing the air groove 1 and the air guide plate 2 to move toward the inner wall of the outer cylinder until the air guide plate 2 fits with the inner wall of the outer cylinder, and the second wedge block 44 fits with the outer wall of the inner cylinder. At this time, the air guide plate 2 is aligned with the weld, thereby ensuring that the weld is always in the working area of ​​the air guide plate 2 to prevent gas leakage.

[0063] Step 3: After connecting the gas source, fill the cavity with protective gas through the gas guide pipe 3, and the protective gas is evenly dispersed through the vents 21 on the gas guide plate 2 and enters the weld. Adjust the gas flow rate so that the welding area is always covered by the protective gas, thereby forming a stable protective atmosphere to prevent external air from entering the weld and causing oxidation.

[0064] Step 4: Complete welding at the weld seam of the outer wall of the outer cylinder according to the preset process requirements.

[0065] This embodiment adopts a single-sided welding and two-sided forming technology, that is, welding is started from the outside of the outer cylinder weld. When the gas supply unit continues to provide protective gas, the operator welds on the outside of the outer cylinder so that both the inside and the outside of the weld are protected. By adjusting the welding speed and welding current, it can be ensured that the forming effect of both sides of the weld is good and there is no air or pores in the weld. After the welding is completed, the gas source is turned off, the first wedge block 42 and the second wedge block 44 are restored to the initial position, and the gas supply unit is removed from the gap between the two layers of the cylinder. Finally, the weld is inspected to ensure that the weld surface is flat and free of pores and that the inside is not oxidized. The weld quality can be tested and evaluated according to the actual situation to ensure that it meets the technical requirements.

[0066] In this embodiment, the gas supply unit and the clamping unit work together, and actual tests show that during the welding process, the gas is evenly distributed and a stable protective atmosphere is formed in the weld area. At the same time, the welding method effectively reduces welding oxidation, improves the mechanical strength and surface finish of the weld, effectively solves the application problem of single-sided welding technology in a narrow space, and significantly improves welding efficiency and finished product quality.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A shielding gas supply device for auxiliary welding, characterized in that: It includes an air supply unit and a clamping unit; The air supply unit comprises an air groove (1), an air guide plate (2) and an air guide pipe (3); the air guide plate (2) is installed at the open end of the air groove (1) and forms a cavity with the air groove (1); the air guide pipe (3) is installed on the side wall of the air groove (1) and is connected to the cavity; the end of the air guide pipe (3) away from the air groove (1) is used to connect to an external gas source and flush the protective gas into the cavity; the air guide plate (2) is provided with a plurality of vents (21) for dispersing the protective gas in the cavity; The clamping unit comprises a first clamping module (4) and a second clamping module (5); the first clamping module (4) and the second clamping module (5) are arranged in parallel, and one end thereof is respectively connected to a side of the air groove (1) away from the air guide plate (2), so as to place the air supply unit and abut against the part to be welded.

2. The shielding gas supply device for auxiliary welding according to claim 1, characterized in that: The air groove (1) is an arc-shaped structure, and the air guide plate (2) is an arc-shaped plate adapted to the arc-shaped structure and is located on the outer arc surface of the arc-shaped structure.

3. The shielding gas supply device for auxiliary welding according to claim 1 or 2, characterized in that: The first clamping module (4) and the second clamping module (5) have the same structure; The first clamping module (4) comprises a fixed component and a movable component; the fixed component comprises a fixed rod (41) and a first wedge block (42) mounted on one end of the fixed rod (41), and a side of the first wedge block (42) away from its inclined surface is connected to a side of the air groove (1) away from the air guide plate (2); The movable assembly comprises a movable rod (43) and a second wedge block (44) mounted on one end of the movable rod (43); the movable rod (43) is arranged in parallel with the fixed rod (41) and is movably connected to the fixed rod (41) through a plurality of fixing pins (45); the second wedge block (44) is located on a side of the first wedge block (42) away from the air groove (1); the first wedge block (42) and the second wedge block (44) are arranged in opposite directions, and the sides with inclined surfaces are opposite to each other.

4. The shielding gas supply device for auxiliary welding according to claim 3, characterized in that: The movable rod (43) is a screw rod, and a rotating member is installed at one end of the movable rod (43) away from the second wedge block (44); a plurality of fixed pins (45) are installed on the same side of the fixed rod (41), and each fixed pin (45) is provided with a thread matched with the screw rod; the movable rod (43) passes through each fixed pin (45) in turn and is movably connected with the second wedge block (44).

5. The shielding gas supply device for auxiliary welding according to claim 4, characterized in that: The rotating member is a butterfly nut.

6. The shielding gas supply device for auxiliary welding according to claim 3, characterized in that: The movable rod (43) is a straight rod, and a locking piece is provided at one end of the movable rod (43) away from the second wedge block (44); a plurality of fixing pins (45) are installed on the same side of the fixing rod (41), and the movable rod (43) passes through each fixing pin (45) in turn and is fixedly connected to the second wedge block (44).

7. The shielding gas supply device for auxiliary welding according to claim 1, characterized in that: The thickness of the air groove (1) is 12 to 15 mm; The vent hole (21) is a circular hole with a hole diameter of 1 to 2 mm.

8. The shielding gas supply device for auxiliary welding according to claim 1, characterized in that: It also comprises a balance rod, which and the air guide pipe (3) are respectively mounted on two ends of the side wall on the same side of the air groove (1).

9. A welding method, characterized in that: The following steps are involved: Step 1, assembling the protective gas supply device for auxiliary welding according to any one of claims 1 to 8, and placing it on one side of the workpiece to be welded, so that the air guide plate (2) of the gas supply unit is close to the weld; Step 2, adjusting the distance between the air guide plate (2) and the workpiece to be welded by means of a clamping unit until the air guide plate (2) fits one side of the workpiece to be welded; Step 3, filling the cavity with protective gas through the air guide pipe (3), and the protective gas is released to the weld through the vent hole (21); Step 4: Complete welding at the weld on the other side of the workpiece to be welded according to the preset process requirements.

10. The welding method according to claim 9, characterized in that: Step 2 specifically comprises adjusting the relative position between the movable rod (43) and the fixed rod (41) so that the first wedge block (42) is relatively displaced relative to the second wedge block (44), and pushing the air groove (1) toward the workpiece to be welded until the air guide plate (2) is in contact with one side of the workpiece to be welded.

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