A shielding gas supply device for assisting welding and a welding method

Abstract

The application discloses a kind of protective gas supply device and welding method for assisting welding, mainly solve the technical problems that welding quality is unstable in prior art, and it is difficult to apply in complex welding scene etc.The device includes gas supply unit and clamping unit;Gas supply unit includes gas tank, gas guide plate and gas guide pipe;Gas guide plate is installed in the opening end of gas tank and is surrounded with gas tank to form a cavity;Gas guide pipe is installed on the side wall of gas tank, and is communicated with the cavity;The end of gas guide pipe away from gas tank is used to connect external gas source, and the protective gas is flushed into the cavity;Gas guide plate is provided with a plurality of air holes;Clamping unit includes first clamping module and second clamping module;First clamping module and second clamping module are arranged in parallel, and one end is connected with the side of gas tank away from gas guide plate respectively, for placing and abutting gas supply unit on the part to be welded.Meanwhile the application also provides a welding method based on the device, convenient to operate, and the welding quality is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to a gas supply device, in particular to a protective gas supply device for assisting welding and a welding method. BACKGROUND

[0002] Gas shielded welding technology is widely used in the welding of steel, aluminum and other metals. It mainly relies on inert or active gas (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 inclusion, porosity, etc. However, the existing gas shielded welding technology is very sensitive to environmental conditions. In particular, in outdoor or ventilated environments, the protective gas is easily blown away, resulting in a weakened gas protection effect and unstable weld quality. In addition, there are many hard-to-reach parts in the welding operation, such as the inner wall of the pipeline, narrow areas, etc., because the protective gas is difficult to accurately cover, thereby increasing the difficulty of welding operation.

[0003] The prior art improves the above problems by using artificial shielding, using a wind shielding device or slowing down the welding speed, etc. 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

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

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows:

[0006] A protective gas supply device for assisting welding, characterized in that it comprises a gas supply unit and a clamping unit.

[0007] The gas supply unit comprises a gas tank, a gas guide plate and a gas guide pipe. The gas guide plate is installed at the opening end of the gas tank and forms a cavity with the gas tank. The gas guide pipe is installed on the side wall of the gas tank and is in communication with the cavity. The end of the gas guide pipe away from the gas tank is used to connect an external gas source and to flush protective gas into the cavity. The gas guide plate is provided with a plurality of gas holes for the emission of protective gas in the cavity.

[0008] 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 end of each is connected to the side of the gas tank away from the gas guide plate, for placing and abutting the gas supply unit on the part to be welded.

[0009] Further, the gas tank is an arc-shaped structure, the gas guide plate is an arc-shaped plate matched with the arc-shaped structure, and is located on the outer arc surface of the arc-shaped structure.

[0010] Further, the first clamping module and the second clamping module are identical in structure;

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

[0012] The movable component comprises a movable rod and a second wedge block installed at one end of the movable rod; the movable rod is arranged in parallel with the fixed rod and is movably connected to the fixed rod through a plurality of fixed 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 oppositely arranged with the sides provided with inclined surfaces opposite to each other.

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

[0014] Further, the rotating piece is a butterfly nut.

[0015] Further, 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; the plurality of fixed pins are installed on the same side of the fixed rod, and the movable rod passes through each fixed pin in sequence and is fixedly connected to the second wedge block.

[0016] Further, the thickness of the air groove is 12-15 mm, which can be applied to auxiliary welding in narrow space.

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

[0018] Further, a balance rod is further included, which is installed at both ends of the same side wall of the air groove with the air guide pipe, for ensuring that the air supply unit can be stably placed at the welding position.

[0019] Meanwhile, the application further provides a welding method, comprising the following steps:

[0020] Step 1, assembling the protective gas supply device for auxiliary welding and placing it on one side of the workpiece to be welded, so that the air guide plate of the air supply unit is close to the weld;

[0021] Step 2, adjusting the distance between the air guide plate and the workpiece to be welded through the clamping unit until the air guide plate is in close contact with one side of the workpiece to be welded;

[0022] Step 3, filling the cavity with protective gas through the air guide pipe, and then the protective gas is discharged to the weld through the air vent;

[0023] Step 4, according to the preset process requirements, the welding of the other side of the workpiece to be welded is completed.

[0024] Further, the step 2 is specifically adjusting 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 the gas groove is pushed to move towards the workpiece to be welded until the gas guide plate is attached to one side of the workpiece to be welded.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows:

[0026] 1、The gas supply unit of the present application comprises a gas groove, a gas guide plate and a gas guide pipe, and a plurality of air holes are provided on the gas guide plate, and 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 discharged through the air holes, and at the same time, the first clamping module and the second clamping module can be used to tightly attach the side of the gas supply unit provided with the gas guide plate 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 gas groove of the present application can be designed as an arc structure, which can ensure that it is attached to the side wall of the product during the welding of the cylindrical product, thereby further improving the welding quality.

[0028] 3、The first clamping module and the second clamping module of the present application have the same structure, wherein the first clamping module comprises a fixed assembly and a movable assembly, and the relative position between the first wedge block in the fixed assembly and the second wedge block in the movable assembly can be adjusted, so as to adjust the overall thickness of the first wedge block and the second wedge block, and ensure that the gas guide plate in the gas supply unit is attached to the workpiece to be welded, thereby improving the stability of the protective gas supply.

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

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

[0031] 6、The present application further comprises a balance rod, which can maintain the stability during the placement of the gas supply unit, thereby avoiding damage to the workpiece to be welded.

[0032] 7、The present application has simple structure and convenient operation, and is suitable for industrial, outdoor construction and special welding scenes, and has broad market application prospect.

[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 production efficiency, adapting to the needs of high-efficiency automated production. Attached Figure Description

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

[0035] Figure 2 This is a schematic diagram of the gas supply unit in an embodiment of the present invention.

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

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

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

[0039] The annotations in the attached figures are explained as follows:

[0040] 1-Air groove, 2-Air guide plate, 21-Air vent, 3-Air guide pipe, 4-First clamping module, 41-Fixing rod, 42-First wedge block, 43-Moving rod, 44-Second wedge block, 45-Fixing pin, 5-Second clamping module. Detailed Implementation

[0041] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely 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. This supply device effectively solves the problem of prior art being susceptible to environmental interference, and can ensure the effective performance of the welding process within an artificially created gas protection area.

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

[0044] The gas groove 1 can be designed as an arc-shaped structure, and the gas guide plate 2 is an arc-shaped plate matched with the arc-shaped structure and located on the outer arc surface of the arc-shaped structure. The advantage of the arc-shaped structure design is that it can uniformly distribute the protective gas in the welding area, thereby reducing the instability of the gas flow caused by concentrated gas supply. The design of the arc-shaped structure can cover a larger 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 matched and designed according to the actual use environment, and 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 made of high-temperature resistant materials and can withstand high temperatures generated during welding while ensuring that the gas is not hindered when passing through.

[0046] The air holes 21 can be circular holes with a diameter of generally 1-2 mm, and the protective gas discharged from the circular holes is more uniform. Of course, the air holes 21 can also be designed in other shapes or corresponding sizes according to actual needs to adapt to the environment applied. The protective gas is uniformly released through the plurality of air holes 21, and the operator can adjust the flow of the protective gas as needed to ensure the best protection effect in the weld area. Compared with the traditional nozzle, the present embodiment is more suitable for use in irregular or difficult-to-reach environments in the welding area.

[0047] As shown in Figure 1 , Figure 3 and Figure 4 , 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 of each is connected to the side of the gas groove 1 away from the gas guide plate 2, for placing and abutting the gas supply unit on the part to be welded.

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

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

[0050] The movable assembly comprises a movable rod 43 and a second wedge block 44 mounted at 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 fixed 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 oppositely arranged with the sides provided with inclined surfaces opposite to each other.

[0051] The movable rod 43 of the embodiment is a screw rod, the movable rod 43 is movably connected to the second wedge block 44, and a butterfly nut is mounted at one end of the movable rod 43 away from the second wedge block 44. The plurality of fixed pins 45 are mounted on the same side of the fixed rod 41, and each fixed pin 45 is provided with a thread matched with the screw rod. In use, the butterfly nut is rotated to drive the movable rod 43 to rotate and move at the same time, the movable rod 43 further drives the second wedge block 44 to move, and after the second wedge block 44 moves to the corresponding position (as shown), the rotation is stopped. Figure 4

[0052] Alternatively, the movable rod 43 can also be designed as a straight rod, and a locking member is arranged at one end of the movable rod 43 away from the second wedge block 44; the plurality of fixed pins 45 are mounted on the same side of the fixed rod 41 and movably connected to the movable rod 43, the movable rod 43 passes through each fixed pin 45 in sequence and is fixedly connected to the second wedge block 44. 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 member, so that the movable rod 43 is fixed relative to the fixed rod 41.

[0053] In summary, the clamping unit of the embodiment as a whole adopts high-strength and durable materials, which can fix the gas supply unit on the welding workpiece. Even if the shape of the workpiece is irregular and the welding angle is tricky, the stability of the gas supply unit can still be ensured.

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

[0055] The embodiment further comprises a balance rod, which is mounted at both ends of the same side wall of the air groove 1 with the air guide pipe 3. When the gas supply unit is placed at the welding position, the balance rod can keep the stability during the placement process to avoid damage to the workpiece to be welded.

[0056] ​This embodiment is also applicable to 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] This invention ensures uniform release of protective gas through gas channels and evenly distributed vents, providing wider coverage of the weld area compared to traditional nozzle designs. This design ensures gas stability in complex or irregular welding scenarios, reducing weld defects such as oxidation and porosity. Simultaneously, the optimized gas flow distribution via vents reduces gas consumption and lowers operating costs, making it suitable for outdoor welding or welding of large workpieces.

[0058] The present invention can be used in the welding process of workpieces of various shapes and sizes. The clamping unit ensures that the gas supply unit does not shift or fall during the welding process. The device is particularly suitable for welding areas in confined spaces, inclined surfaces or other hard-to-reach areas. It is easy to operate, can be deployed quickly, and improves welding efficiency.

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

[0060] Combination Figures 1 to 4 This embodiment also provides a welding method for a double-layer steel cylindrical structure ( Figure 5 Taking the welding shown in the diagram as an example, the bottoms of the two cylindrical layers at the same end are connected by a steel ring. Because the gap between the two cylindrical layers is very narrow, traditional double-sided welding cannot be implemented; therefore, a single-sided welding double-sided forming technique is chosen. During the welding process, it is necessary to ensure sufficient shielding gas in the welding area to prevent welding defects such as oxidation, thereby ensuring the quality and strength of the weld. This welding method includes the following steps:

[0061] Step 1: First, complete the welding of the inner cylinder and the steel ring using conventional welding processes. Then, fit the outer cylinder onto the inner cylinder and place it on the steel ring, positioning the weld seam. Next, assemble the protective gas supply device for auxiliary welding as described in this embodiment and place it in the gap between the two cylinders. At this time, the gas groove 1 and the gas guide plate 2 have an arc shape, which matches the gap between the two cylinders. When placing it, make one side of the gas guide plate 2 close to the weld seam 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 relative to the second wedge block 44, that is, the thickness of the whole of the first wedge block 42 and the second wedge block 44 is increased, thereby pushing the gas groove 1 and the gas guide plate 2 to move towards the inner wall of the outer layer cylinder until the gas guide plate 2 is in close contact with the inner wall of the outer layer cylinder, and the second wedge block 44 is in close contact with the outer wall of the inner layer cylinder, at this time, the gas guide plate 2 is aligned with the weld, thereby ensuring that the weld is always in the working area of the gas guide plate 2, preventing gas leakage.

[0063] Step 3, after connecting the gas source, the cavity is filled with protective gas through the gas guide pipe 3, then the protective gas is uniformly dispersed through the air holes 21 on the gas guide plate 2 and enters the weld. Adjust the gas flow so that the welding area is always covered with protective gas, thereby forming a stable protective atmosphere to prevent external air from entering the weld and causing oxidation.

[0064] Step 4, according to the pre-set process requirements, welding is completed at the weld on the outer side wall of the outer layer cylinder.

[0065] The present embodiment adopts single-sided welding and double-sided forming technology, that is, welding is started from the outside of the weld on the outer layer cylinder. In the case that the gas supply unit continuously provides protective gas, the operator welds on the outside of the outer layer cylinder, so that the inside and outside of the weld are protected. By adjusting the welding speed and welding current, it can be ensured that the double-sided forming effect of the weld is good, and there is no air or porosity in the weld. After 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 layer cylinders. Finally, the weld is inspected to ensure that the weld surface is smooth and free of pores, and the inside is not oxidized. The weld quality can be detected and evaluated according to the actual situation to ensure that it meets the technical requirements.

[0066] The present embodiment cooperates with the gas supply unit and the clamping unit, and actual tests show that during welding, the gas is uniformly distributed, and a stable protective atmosphere is formed in the weld area. At the same time, the welding method effectively reduces the welding oxidation phenomenon, 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 the welding efficiency and product quality.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for part or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A protective gas supply device for assisting welding, which is used for the auxiliary welding of a double-layer steel cylinder, the bottom of the same end of the two layers of the cylinder is connected by a steel ring, and a gap is left between the two layers of the cylinder; characterized in that: it comprises a gas supply unit and a clamping unit; the gas supply unit comprises a gas groove (1), a gas guide plate (2) and a gas guide pipe (3); the gas guide plate (2) is installed at the opening end of the gas groove (1) and forms a cavity with the gas groove (1); the gas groove (1) is an arc-shaped structure, and the thickness of the gas groove (1) is 12-15 mm; the gas guide plate (2) is an arc-shaped plate matched with the arc-shaped structure and is located on the outer arc surface of the arc-shaped structure; the gas guide pipe (3) is installed on the side wall of the gas groove (1) and is in communication with the cavity; one end of the gas guide pipe (3) away from the gas groove (1) is used to connect an external gas source and to flush protective gas into the cavity; a plurality of air holes (21) are provided on the gas guide plate (2) for the emission of 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 of each is connected to the side of the gas groove (1) away from the gas guide plate (2) for placing the gas supply unit and abutting it to the welding position; 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-shaped block (42) installed at one end of the fixed rod (41), and the side of the first wedge-shaped block (42) away from the inclined surface is connected to the side of the gas groove (1) away from the gas guide plate (2); the movable component comprises a movable rod (43) and a second wedge-shaped block (44) installed at 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 fixed pins (45); the second wedge-shaped block (44) is located on the side of the first wedge-shaped block (42) away from the gas groove (1); the first wedge-shaped block (42) and the second wedge-shaped block (44) are oppositely arranged with the sides provided with inclined surfaces opposite to each other; in use, the gas supply unit is placed and abutted to the welding position between the two layers of the cylinder by the first clamping module (4) and the second clamping module (5), and then single-sided welding double-sided forming technology is used for welding.

2. The protective gas supply device for assisting welding according to claim 1, characterized in that: the movable rod (43) is a lead screw, and a rotating part is installed at one end of the movable rod (43) away from the second wedge-shaped 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 lead screw; the movable rod (43) passes through each fixed pin (45) in turn and is movably connected to the second wedge-shaped block (44).

3. The protective gas supply device for assisting welding according to claim 2, characterized in that: the rotating part is a butterfly nut. ​ ​ ​ ​ ​ ​ ​ ​ ​ 4. The protective gas supply device for assisting welding according to claim 1, characterized in that: The movable rod (43) is a straight rod, and the end of the movable rod (43) away from the second wedge block (44) is provided with a locking member; a plurality of fixed pins (45) are installed on the same side of the fixed rod (41), and the movable rod (43) passes through each fixed pin (45) in sequence and is fixedly connected with the second wedge block (44).

5. The protective gas supply device for assisting welding according to claim 1, characterized in that: The air hole (21) is a circular hole with a diameter of 1-2 mm.

6. The protective gas supply device for assisting welding according to claim 1, characterized in that: It further comprises a balance rod which is installed at both ends of the same side wall of the gas groove (1) with the gas guide pipe (3) respectively.

7. A method of welding a double-layered steel cylinder, characterized by, It comprises the following steps: Step 1, assemble the protective gas supply device for assisting welding according to any one of claims 1 to 6, and place it in the gap between the two layers of cylinders, so that the gas guide plate (2) of the gas supply unit is close to the weld of the inner wall surface of the outer cylinder; 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 relative to the second wedge block (44), and the gas groove (1) is pushed towards the inner wall surface of the outer cylinder until the gas guide plate (2) is in close contact with the inner wall surface of the outer cylinder; Step 3, fill the cavity with protective gas through the gas guide pipe (3), then the protective gas is discharged to the weld through the air hole (21); Step 4, according to the predetermined process requirement, the single-sided welding and double-sided forming technology is used to complete the welding at the outer side of the weld of the outer cylinder.

Images