Welding auxiliary device

Abstract

The embodiment of the invention provides a welding auxiliary device which comprises a mounting seat, a gas needle and a welding torch, the gas needle is mounted on the mounting seat, the mounting seat is fixedly connected with the welding torch, and the welding torch is used for welding a welding seam on a workpiece; the gas outlet end of the gas needle is opposite to the weld joint, and the gas needle is configured to spray inert gas to the weld joint. In the welding process, the inert gas sprayed out of the gas needle to the molten pool can stir molten metal in the molten pool, gas holes in the molten pool are promoted to escape, and therefore the mechanical property of a weld joint solidification structure is improved, and the strength of welding connection is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a welding auxiliary device. Background Art

[0002] Improving product integration is an important way to reduce automobile R&D and manufacturing costs and achieve lightweight automobiles. Driven by this demand, aluminum alloy integrated die-casting technology has received more and more attention and has been widely used. When integrated die-cast aluminum alloy parts are used on the body, the integrated die-cast aluminum alloy parts are generally connected to the surrounding parts through MIG welding (molten inert gas shielded welding). However, since the welded joints of cast aluminum alloy parts usually have a large number of micro-pores and hydrogen elements that did not escape in time during solidification, during the MIG welding process, these pores and hydrogen elements gather in the welding pool, resulting in the formation of dense pores inside and on the surface of the weld, which reduces the welding connection strength of the cast aluminum alloy parts and affects the overall strength of the car body.

[0003] In order to solve the above problems, the related art provides a method for improving the microstructure of the weld. In this method, a subharmonic vibration welding device is used to apply subharmonic vibration to the workpiece during the welding process. However, the vibration is applied to the entire die-cast aluminum alloy component, and cannot be applied to a single weld. In addition, the die-cast aluminum alloy component is usually clamped by a fixture during the welding process. The vibration amplitude of the entire die-cast aluminum alloy component is small, and the improvement effect on the quality of the weld is small. The related art also provides a welding method for reducing welding porosity by adding an auxiliary vibration source to vibrate the welding wire during the welding process. However, the vibrating welding wire causes the arc to vibrate, affecting the molten droplet transition, and easily causing arc instability or even arc extinction, thereby affecting the forming quality of the weld. Summary of the invention

[0004] In view of this, an embodiment of the present disclosure provides a welding auxiliary device, which can better improve the welding quality of cast aluminum alloy parts.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, an embodiment of the present disclosure provides a welding auxiliary device, the welding auxiliary device comprising a mounting seat, a gas needle and a welding torch, the gas needle is mounted on the mounting seat, the mounting seat is fixedly connected to the welding torch, and the welding torch is used to weld a weld on a workpiece;

[0007] The gas outlet end of the gas needle is opposite to the weld, and the gas needle is configured to spray inert gas toward the weld.

[0008] Optionally, the mounting seat comprises a motor, a transmission mechanism and a housing, the motor and the transmission mechanism are located in the housing, the air needle is partially located in the housing, and the air outlet end of the air needle extends outside the housing;

[0009] The motor is connected to the air needle through the transmission mechanism, and causes the air needle to reciprocate inside the shell.

[0010] Optionally, the transmission mechanism includes a slider and a guide rail, the guide rail is fixedly connected to the inner wall of the shell, the slider is slidably matched with the guide rail, the slider is detachably connected to the air needle, and the motor is configured to drive the slider to slide back and forth in the guide rail.

[0011] Optionally, the transmission mechanism also includes a turntable and a connecting pin, one side of the turntable is fixedly connected to the output shaft of the motor, and the connection between the turntable and the output shaft deviates from the axis of the turntable, the other side of the turntable is connected to one end of the connecting pin, and the other end of the connecting pin is connected to the slider.

[0012] Optionally, a limiting groove is provided on the other side of the turntable, the limiting groove is annular, the limiting groove is concentric with the turntable, and one end of the connecting pin is slidably engaged with the limiting groove.

[0013] Optionally, the welding auxiliary device further comprises an actuator, and the actuator is fixedly connected to the mounting seat and the welding torch respectively.

[0014] Optionally, the welding auxiliary device further comprises an air pipe and a gas cylinder, one end of the air pipe is connected to the gas cylinder, and the other end of the air pipe is connected to the air inlet end of the gas needle.

[0015] Optionally, the welding auxiliary device further comprises an air valve and a flow meter, wherein the air valve and the flow meter are arranged in the air pipe, and the air valve is used to control the on-off of the air pipe.

[0016] Optionally, the welding auxiliary device further comprises a robot arm, wherein the robot arm is connected to the actuator, and the robot arm is configured to move the actuator along the weld to perform welding.

[0017] Optionally, the welding auxiliary device further includes a controller, and the controller is electrically connected to the mounting seat, the gas valve, and the robotic arm, respectively.

[0018] Optionally, the inner diameter of the gas needle is 0.3mm-0.5mm, the outer diameter of the gas needle is 3mm-4mm, and the length of the gas needle is 50mm-80mm.

[0019] The beneficial effects of the technical solution provided by the embodiments of the present disclosure include at least:

[0020] In the welding auxiliary device provided by the embodiment of the present disclosure, the mounting seat is fixedly connected to the welding torch, and when the welding torch moves along the weld to perform welding, the gas needle can move synchronously with the welding torch. During the welding process, the inert gas sprayed by the gas needle into the molten pool can stir the molten metal in the molten pool, promote the escape of pores in the molten pool, thereby improving the mechanical properties of the weld solidification structure and improving the strength of the weld connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of a welding auxiliary device provided in an embodiment of the present disclosure;

[0023] Figure 2 A partial schematic diagram of a welding auxiliary device provided in an embodiment of the present disclosure;

[0024] Figure 3 A schematic diagram of a mounting base of a welding auxiliary device provided in an embodiment of the present disclosure;

[0025] Figure 4 A schematic diagram of a mounting base of a welding auxiliary device provided in an embodiment of the present disclosure;

[0026] Figure 5 for Figure 4 A cross-sectional view of the mounting seat shown along the AA section line;

[0027] Figure 6 A partial schematic diagram of a mounting base of a welding auxiliary device provided in an embodiment of the present disclosure;

[0028] Figure 7 A partial schematic diagram of another mounting base of the welding auxiliary device provided in an embodiment of the present disclosure.

[0029] The reference numerals in the figures represent respectively:

[0030] 1-mounting seat; 2-gas needle; 3-welding torch; 4-workpiece; 5-actuator; 6-gas pipe; 7-gas cylinder; 8-gas valve; 9-flow meter; 10-connecting rod; 11-mechanical arm; 12-controller;

[0031] 101-motor; 102-transmission mechanism; 103-housing; 301-welding wire; 401-welding seam; 402-molten pool;

[0032] 1011 - output shaft; 1021 - slider; 1022 - guide rail; 1023 - turntable; 1024 - connecting pin; 1025 - limit groove; 1026 - track groove; 1027 - sliding part; 1028 - mounting hole.

[0033] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0035] Aluminum alloy integrated die-casting technology has been widely used in the field of automobile manufacturing. When integrated die-cast aluminum alloy parts are used on the body, they are generally connected to surrounding parts through MIG welding. However, since the welded joints of cast aluminum alloy parts usually have a large number of micro-pores and hydrogen elements that did not escape in time during solidification, these pores and hydrogen elements gather in the welding pool during the MIG welding process, resulting in the formation of dense pores inside and on the surface of the weld, which reduces the welding connection strength of the cast aluminum alloy parts and affects the overall strength of the car body.

[0036] To solve the above problems, the related art provides a method for improving the microstructure of the weld. The method uses a subharmonic vibration welding device to apply subharmonic vibration to the workpiece during the welding process. However, the vibration is applied to the entire die-cast aluminum alloy component, and cannot be applied to a single weld. In addition, the die-cast aluminum alloy component is usually clamped by a fixture during the welding process. The vibration amplitude of the entire die-cast aluminum alloy component is small, and the improvement effect on the quality of the weld is small. The related art also provides a welding method for reducing welding pores by adding an auxiliary vibration source to vibrate the welding wire during the welding process, but the vibrating welding wire causes the arc to vibrate, affecting the molten droplet transition, and easily causing the arc to be unstable, and even causing arc extinction, thereby affecting the forming quality of the weld. The related art also provides a solution for inserting a stirring needle with a reciprocating ultrasonic vibration feature into the molten pool, and implementing ultrasonic vibration and stirring during the metal solidification process to improve the weld solidification structure and mechanical properties. However, the temperature of the arc during welding can be as high as 3000℃ to 4000℃. Even if high-temperature resistant materials such as metal tungsten or tungsten alloy are used, it is still difficult to avoid damage to the stirring needle and contamination of the welding molten pool.

[0037] In view of this, an embodiment of the present disclosure provides a welding auxiliary device that can better improve the welding quality of cast aluminum alloy parts. Figure 1 A schematic diagram of a welding auxiliary device provided in an embodiment of the present disclosure, such as Figure 1 As shown, the welding auxiliary device includes a mounting base 1, a gas needle 2 and a welding torch 3. The gas needle 2 is installed on the mounting base 1. The mounting base 1 is fixedly connected to the welding torch 3. The welding torch 3 is used to weld the weld 401 on the workpiece 4. The gas outlet end of the gas needle 2 is opposite to the weld 401, and the gas needle 2 is configured to spray inert gas toward the weld 401.

[0038] In the welding auxiliary device provided by the embodiment of the present disclosure, the mounting base 1 is fixedly connected to the welding torch 3, and when the welding torch 3 moves along the weld 401 for welding, the gas needle 2 can move synchronously with the welding torch 3. During the welding process, the inert gas sprayed by the gas needle 2 to the molten pool 402 on the workpiece 4 is blown on the surface of the molten metal, which can stir the molten metal in the molten pool 402 and promote the escape of pores in the molten pool 402, thereby improving the mechanical properties of the weld solidification structure and improving the strength of the weld connection.

[0039] In order to make the technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, the welding auxiliary device provided by the embodiment of the present disclosure includes a mounting seat 1, a gas needle 2 and a welding torch 3, the gas needle 2 is mounted on the mounting seat 1, the mounting seat 1 is fixedly connected to the welding torch 3, and the welding torch 3 is used to weld the weld 401 on the workpiece 4. When the welding torch 3 moves along the weld and performs welding, the mounting seat 1 and the gas needle 2 move synchronously with the welding torch 3. Moreover, the gas outlet end of the gas needle 2 is opposite to the weld 401, and the gas needle 2 is configured to spray an inert gas to the weld 401. The inert gas can be carbon dioxide, argon, helium, etc., and the purity of the inert gas is not less than 99.995% to ensure that other gases will not pollute the welding molten pool. Gases such as argon and helium do not react with the molten pool 402, nor do they dissolve in the molten pool 402. When the gas escapes, it can also carry out the dispersed hydrogen element. The sprayed inert gas can stir the molten metal in the molten pool 402 of the workpiece 4, which is conducive to the discharge of pores in the metal, improve the mechanical properties at the weld 401, and improve the welding strength. It should be noted that, since the molten metal has a higher density, the inert gas ejected by the gas needle 2 will not blow the molten metal out of the molten pool 402, but can stir the molten pool 402 and promote the rapid escape of the pores in the molten pool 402, thereby improving the mechanical properties of the weld solidification structure and increasing the strength of the weld connection.

[0041] In some embodiments of the present disclosure, Figure 1As shown, the welding auxiliary device further includes an actuator 5, which is fixedly connected to the mounting base 1 and the welding torch 3 respectively, and is used to operate the welding torch 3 to perform welding operations.

[0042] Alternatively, if Figure 1 As shown, the welding auxiliary device further includes an air pipe 6 and an air cylinder 7, one end of the air pipe 6 is connected to the air cylinder 7, and the other end of the air pipe 6 is connected to the air inlet end of the air needle 2. The air cylinder 7 stores inert gas, and the inert gas is transported to the air needle 2 through the air pipe 6. It should be noted that the part of the air pipe 6 close to the air needle 2 can be fixed on the housing of the actuator 5 to move with the actuator 5, the air needle 2 and the welding torch 3.

[0043] In some embodiments of the present disclosure, see Figure 1 The welding auxiliary device also includes an air valve 8 and a flow meter 9. The air valve 8 and the flow meter 9 are arranged in the air pipe 6. The air valve 8 is used to control the on-off of the air pipe 6. By controlling the on-off of the air pipe 6 by the air valve 8, it is possible to control whether the gas needle sprays gas. The air valve 8 can be set to open automatically, for example, before starting welding. The flow meter 9 is used to monitor the gas flow through the air pipe 6 to prevent the pressure of the sprayed gas from being too high or too low. During the welding process, the gas flow in the pipeline can be 10L / min-15L / min. Using an appropriate flow of gas can avoid excessive stirring of the molten pool 402. Excessive stirring will affect the crystallization of the weld and reduce the welding quality.

[0044] In some embodiments of the present disclosure, Figure 1 As shown, the welding auxiliary device further includes a mechanical arm 11, which is connected to the actuator 5, and is configured to move the actuator 5 along the length direction of the weld 401, and simultaneously reciprocate the actuator 5 in a short distance along the length direction perpendicular to the weld 401 to perform uniform welding. The mechanical arm 11 is used to adjust the position of the actuator 5, so that the welding torch 3 and the gas needle 2 can move along the extension direction of the weld 401, thereby automatically completing the welding.

[0045] Figure 2 A partial schematic diagram of a welding auxiliary device provided in an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 2As shown, the welding auxiliary device also includes a connecting rod 10, one end of which is fixedly connected to the mounting seat 1, and the other end of the connecting rod 10 is fixedly connected to the housing of the actuator 5. Exemplarily, the housing 103, the connecting rod 10 and the housing of the actuator 5 are all made of metal, and the connecting rod 10 is connected to the housing 103 and the housing of the actuator 5 by welding. Taking MIG welding as an example, a welding wire 301 is provided in the welding torch 3, and the tail end of the welding torch 3 is connected to the actuator 5. During the welding process, the welding wire 301 is melted by the arc heat as an electrode, and the actuator 5 is used to continuously transport the welding wire 301 to the weld 401, and surround the welding wire 301 to provide current and inert gas to the molten pool 402. The inert gas can effectively isolate the air, prevent metal oxidation in the welding area, and ensure the welding quality. In addition, the welding auxiliary device involved in the embodiment of the present disclosure can also be used for TIG welding (non-melting inert gas shielded welding). In TIG welding, the welding wire is located outside the welding torch 3, a non-melting electrode is arranged inside the welding torch 3, and the actuator 5 is used to supply power to the non-melting electrode and provide inert gas.

[0046] It should be noted that the material of the gas needle 2 provided in the embodiment of the present disclosure is a high temperature resistant tungsten alloy, the outer diameter of the gas needle 2 is 3mm-4mm, the inner diameter is 0.3mm-0.5mm, and the length is 50mm-80mm. The gas outlet end of the gas needle 2 is provided with a chamfered structure, and the inner diameter of the gas outlet end of the gas needle 2 is small, which is conducive to ejecting higher pressure inert gas.

[0047] Figure 3 A schematic diagram of a mounting base of a welding auxiliary device provided in an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 3 As shown, the mounting base 1 includes a motor 101, a transmission mechanism 102 and a housing 103. The motor 101 and the transmission mechanism 102 are located in the housing 103, and the gas needle 2 is partially located in the housing 103. The gas outlet end of the gas needle 2 extends outside the housing 103. The motor 101 is fixedly connected to the housing 103. The motor 101 is transmission-connected to the gas needle 2 through the transmission mechanism 102, and the gas needle 2 reciprocates inside the housing 103. During the reciprocating motion of the gas needle 2 inside the housing 103, the gas outlet end of the gas needle 2 always faces the molten pool 402. The moving direction of the gas needle 2 can be a direction away from and close to the molten pool 402, or a reciprocating motion in a direction parallel to the extension direction of the weld 401, or a reciprocating motion in a direction perpendicular to the extension direction of the weld 401. The moving gas needle 2 can expand the airflow area blown to the molten pool 402, so that a larger area of ​​molten metal is fully stirred, so that the pores in the weld can be better discharged.

[0048] Preferably, the gas needle 2 performs reciprocating motion in a direction perpendicular to the extension direction of the weld 401 , the amplitude of the reciprocating motion of the gas needle 2 is 1.5 mm-2.5 mm, and the frequency of the reciprocating motion is 10 Hz-20 Hz.

[0049] In some embodiments of the present disclosure, Figure 3 As shown, the transmission mechanism 102 includes a slider 1021 and a guide rail 1022, the guide rail 1022 is fixedly connected to the inner wall of the housing 103, the slider 1021 is slidably matched with the guide rail 1022, the slider 1021 is fixedly connected to the air needle 2, and the motor 101 is configured to drive the slider 1021 to slide back and forth in the guide rail 1022. The length direction of the guide rail 1022 is perpendicular to the length direction of the weld 401, and the effective sliding length of the guide rail 1022 is 1.5mm-2.5mm. One end of the air pipe 6 is located in the housing 103 and is connected to the air inlet end of the air needle 2. When the motor 101 drives the slider 1021 to slide relative to the guide rail 1022, the air needle 2 moves with the slider 1021 and reciprocates within the length range of the guide rail 1022.

[0050] In some embodiments of the present disclosure, Figure 3 As shown, the transmission mechanism 102 further includes a rotating disk 1023 and a connecting pin 1024. One side of the rotating disk 1023 is fixedly connected to the output shaft 1011 of the motor 101, and the connection between the rotating disk 1023 and the output shaft 1011 deviates from the axis of the rotating disk 1023. The other side of the rotating disk 1023 is connected to one end of the connecting pin 1024, and the other end of the connecting pin 1024 is connected to the slider 1021. The rotating disk 1023 is a cylindrical structure, and the rotating disk 1023 has two opposite end faces. The output shaft 1011 of the motor 101 is connected to one end face of the rotating disk 1023, and the connecting pin 1024 is connected to the other end face of the rotating disk 1023. The output shaft 1011 is eccentrically connected to the rotating disk 1023. When the output shaft 1011 drives the rotating disk 1023 to rotate, the distance between the connecting pin 1024 and the output shaft 1011 changes continuously, thereby driving the slider 1021 to move relative to the guide rail 1022. Specifically, the distance between the connection point between the output shaft 1011 and the rotating disk 1023 and the center of the rotating disk 1023 is 1.5 mm-2.5 mm.

[0051] Figure 4 A schematic diagram of a mounting base for a welding auxiliary device provided in an embodiment of the present disclosure. Figure 5 for Figure 4 The cross-sectional view of the mounting seat shown in FIG. 1 is taken along the AA section line. In some embodiments of the present disclosure, as shown in FIG. Figure 4-5As shown, a limiting groove 1025 is provided on the other side of the rotating disk 1023. The limiting groove 1025 is annular and is concentrically arranged with the rotating disk 1023. One end of the connecting pin 1024 is slidably matched with the limiting groove 1025, and the other end of the connecting pin 1024 is fixedly connected to a side of the slider 1021 close to the rotating disk 1023. The rotating disk 1023 is provided with a limiting groove 1025 on a side away from the output shaft 1011, and the connecting pin 1024 can slide in the limiting groove 1025. When the output shaft 1011 drives the rotating disk 1023 to rotate, the connecting pin 1024 slides along the annular limiting groove 1025, thereby driving the slider 1021 to perform translational motion.

[0052] Figure 6 A partial schematic diagram of a mounting base of a welding auxiliary device provided in an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 6 As shown, the main body of the slider 1021 is in the shape of a flat plate, and the slider 1021 is provided with a through hole for installing the air needle 2, and the air needle 2 is fixed in the through hole.

[0053] Alternatively, see Figure 6 The slide rail 1022 is provided with an inverted T-shaped track groove 1026, and the side of the slider 1021 close to the slide rail 1022 is provided with an inverted T-shaped sliding portion 1027, and the sliding portion 1027 is slidably matched with the track groove 1026. The matching structure of the inverted T-shaped track groove 1026 and the inverted T-shaped sliding portion 1027 can prevent the slider 1021 from being separated from the slide rail 1022 due to vibration, thereby improving the stability of the reciprocating motion of the air needle 2.

[0054] Preferably, lubricating oil may be coated in the limiting groove 1025 and the track groove 1026 to reduce the friction between the connecting pin 1024 and the limiting groove 1025 and between the sliding part 1027 and the track groove 1026 , thereby extending the service life of the mounting seat 1 .

[0055] Figure 7 A partial schematic diagram of another mounting base of a welding auxiliary device provided in an embodiment of the present disclosure. In some embodiments of the present disclosure, such as Figure 7 As shown, the transmission mechanism 102 includes a slider 1021 and two guide rails 1022, the two guide rails 1022 are respectively located on opposite sides of the slider 1021, and the two guide rails 1022 are respectively located on opposite inner walls of the housing 103. Each guide rail 1022 is provided with a track groove 1026, the upper and lower ends of the slider 1021 are respectively located in the track groove 1026, and the slider 1021 is slidably matched with the track groove 1026.

[0056] Optionally, the gas needle 2 is detachably connected to the slider 1021. After the gas needle 2 is used for a long time, the gas outlet end of the gas needle 2 may be oxidized or deformed due to being in a high temperature state for a long time. At this time, the gas needle 2 can be removed from the slider 1021 and replaced to ensure smooth welding. Exemplarily, the slider 1021 is provided with a mounting hole 1028, the gas needle 2 is located in the mounting hole 1028, the mounting hole 1028 is provided with an internal thread, and the gas needle 2 is connected to the slider 1021 through the thread.

[0057] In some embodiments of the present disclosure, see Figure 1 The welding auxiliary device further includes a controller 12, which is electrically connected to the mounting base 1, the gas valve 8, and the mechanical arm 11. The controller 12 is used to control the movement of the mechanical arm 11, thereby realizing automatic welding of the weld 401. The controller 12 can also control the opening and closing of the gas valve 8 and the operation of the motor 101, so that the gas valve 8 is opened and the motor 101 is started when welding starts, and the gas valve 8 is closed and the motor 101 is stopped when welding ends.

[0058] In summary, in the welding auxiliary device provided by the embodiment of the present disclosure, the mounting base 1 is fixedly connected to the welding torch 3, and when the welding torch 3 moves along the weld 401 for welding, the gas needle 2 can move synchronously with the welding torch 3. During the welding process, the inert gas sprayed by the gas needle 2 to the molten pool 402 on the workpiece 4 can stir the molten metal in the molten pool 402, promote the escape of pores in the molten pool, thereby improving the mechanical properties of the weld solidification structure and improving the strength of the weld connection.

[0059] In addition, the embodiment of the present disclosure also provides a welding method, which uses the welding auxiliary device in any of the above embodiments to weld the weld 401 of the workpiece 4. Specifically, the welding method includes the following steps:

[0060] Step 1: Cleaning and preheating the weld 401 area of ​​the workpiece 4;

[0061] Step 2: Start the welding torch 3 and the motor 101, open the gas valve 8, and control the robot arm 11 to move the welding torch 3 to perform welding. Starting the welding torch 3 includes setting the current and voltage of the welding machine and igniting the arc. The robot arm 11 moves the welding torch 3 to swing left and right, and moves along the length direction of the weld 401, while feeding the wire to complete the welding.

[0062] In the welding method provided by the embodiment of the present disclosure, the mounting base 1 of the welding auxiliary device is fixedly connected to the welding torch 3, and when the welding torch 3 moves along the weld 401 for welding, the gas needle 2 can move synchronously with the welding torch 3. During the welding process, the inert gas sprayed by the gas needle 2 to the molten pool 402 on the workpiece 4 can stir the molten metal in the molten pool 402, promote the escape of pores in the molten pool, thereby improving the mechanical properties of the weld solidification structure and improving the strength of the weld connection.

[0063] It should be noted that the "several" and "at least one" mentioned in this article refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0065] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0066] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0067] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure.

[0068] The above descriptions are merely embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A welding auxiliary device, characterized in that: It comprises a mounting seat (1), a gas needle (2) and a welding torch (3), wherein the gas needle (2) is mounted on the mounting seat (1), the mounting seat (1) is fixedly connected to the welding torch (3), and the welding torch (3) is used to weld a weld (401) on a workpiece (4); The gas outlet end of the gas needle (2) is opposite to the weld (401), and the gas needle (2) is configured to spray inert gas toward the weld (401).

2. The welding auxiliary device according to claim 1, characterized in that: The mounting base (1) comprises a motor (101), a transmission mechanism (102) and a housing (103); the motor (101) and the transmission mechanism (102) are located in the housing (103); the air needle (2) is partially located in the housing (103); and the air outlet end of the air needle (2) extends outside the housing (103); The motor (101) is in transmission connection with the air needle (2) via the transmission mechanism (102), and enables the air needle (2) to perform reciprocating motion inside the housing (103).

3. The welding auxiliary device according to claim 2, characterized in that: The transmission mechanism (102) comprises a slider (1021) and a guide rail (1022); the guide rail (1022) is fixedly connected to the inner wall of the housing (103); the slider (1021) and the guide rail (1022) are slidably matched; the slider (1021) and the air needle (2) are detachably connected; and the motor (101) is configured to drive the slider (1021) to slide back and forth in the guide rail (1022).

4. The welding auxiliary device according to claim 3, characterized in that: The transmission mechanism (102) further comprises a rotating disk (1023) and a connecting pin (1024); one side of the rotating disk (1023) is fixedly connected to the output shaft (1011) of the motor (101); and the connection between the rotating disk (1023) and the output shaft (1011) deviates from the axis of the rotating disk (1023); the other side of the rotating disk (1023) is connected to one end of the connecting pin (1024); and the other end of the connecting pin (1024) is connected to the slider (1021).

5. The welding auxiliary device according to claim 4, characterized in that: A limiting groove (1025) is provided on the other side of the rotating disk (1023). The limiting groove (1025) is annular and is concentrically arranged with the rotating disk (1023). One end of the connecting pin (1024) is slidably matched with the limiting groove (1025).

6. The welding auxiliary device according to claim 1, characterized in that: The welding auxiliary device further comprises an actuator (5), wherein the actuator (5) is fixedly connected to the mounting seat (1) and the welding torch (3) respectively.

7. The welding auxiliary device according to claim 6, characterized in that: The welding auxiliary device further comprises an air pipe (6) and an air cylinder (7), one end of the air pipe (6) being connected to the air cylinder (7), and the other end of the air pipe (6) being connected to the air inlet end of the air needle (2).

8. The welding auxiliary device according to claim 7, characterized in that: The welding auxiliary device further comprises an air valve (8) and a flow meter (9), wherein the air valve (8) and the flow meter (9) are arranged in the air pipe (6), and the air valve (8) is used to control the on-off of the air pipe (6).

9. The welding auxiliary device according to claim 8, characterized in that: The welding auxiliary device further comprises a mechanical arm (11), wherein the mechanical arm (11) is connected to the actuator (5), and the mechanical arm (11) is configured to move the actuator (5) along the weld (401) to perform welding.

10. The welding auxiliary device according to claim 9, characterized in that: The welding auxiliary device further comprises a controller (12), wherein the controller (12) is electrically connected to the mounting seat (1), the gas valve (8), and the mechanical arm (11), respectively.

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