A back gas shielded drag shield for argon arc welding of high nitrogen steel

Abstract

The utility model relates to high nitrogen steel argon arc welding technical field, and disclose a high nitrogen steel argon arc welding back gas protection drag cover, including back gas protection drag cover main part, back gas protection drag cover main part bottom both sides all are fixedly connected with the skirt, back gas protection drag cover main part top left side is provided with the conveying mechanism, back gas protection drag cover main part top right side is provided with the conveying mechanism. This high nitrogen steel argon arc welding back gas protection drag cover, through the setting adjusting mechanism, adjusts the fit angle of drag cover and weld back, makes the protection gas (argon) can tightly wrap the molten pool and heat affected zone (HAZ) of weld back, eliminates the protection " dead angle " (such as the root of groove, dull edge position), through the setting conveying mechanism, the gasket has elasticity, can buffer the vibration of air inlet and drag cover main part connection time, fills the gap to enhance the leakproofness simultaneously, prevents the protection gas (such as argon) from leaking from the connecting part.

Description

Technical Field

[0001] This utility model relates to the field of high-nitrogen steel argon arc welding technology, specifically to a back gas protection shield for high-nitrogen steel argon arc welding. Background Technology

[0002] High-nitrogen steel is a special type of steel with nitrogen as the main alloying element (typically nitrogen content > 0.3%). Nitrogen in steel mainly plays a role in solid solution strengthening, improving corrosion resistance (especially resistance to pitting and crevice corrosion), improving toughness, and reducing notch sensitivity. It is widely used in fields such as chemical engineering, marine engineering, and pressure vessels where material strength and corrosion resistance are extremely important. Argon arc welding (inert gas shielded welding) is one of the mainstream welding methods for high-nitrogen steel due to its good shielding effect, stable arc, and high weld quality.

[0003] Most existing back gas shields for high-nitrogen steel argon arc welding do not have an angle adjustment function. This results in the shield not being able to tightly wrap the molten pool and heat-affected zone on the back of the weld when adjusting the contact angle between the shield and the back of the weld, leading to an excessively large dead angle. Utility Model Content

[0004] The purpose of this invention is to provide a back gas shield for high-nitrogen steel argon arc welding, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a back gas protection shroud for high nitrogen steel argon arc welding, comprising a back gas protection shroud body, wherein skirts are fixedly connected to both sides of the bottom of the back gas protection shroud body, a conveying mechanism is provided on the top left side of the back gas protection shroud body, and an adjustment mechanism is provided on the top right side of the back gas protection shroud body.

[0006] The adjustment mechanism includes a connecting plate, which is fixedly connected to the right side of the main surface of the back gas protection shroud. A connecting block is fixedly connected to the surface of the connecting plate, and a support shaft is rotatably connected between the two connecting blocks. An arc-shaped plate is fixedly connected to both sides of the surface of the support shaft, and a limit rod is fixedly connected to the surface of the arc-shaped plate.

[0007] Preferably, the connecting block has an arc-shaped groove, and the limiting rod is slidably connected in the arc-shaped groove. There are two limiting rods, which are symmetrically arranged. The arc-shaped groove provides a sliding trajectory for the limiting rods, which, together with the limiting rods, restrict the rotation range of the arc plate and ensure the stability of the trajectory of the arc plate when rotating around the support axis.

[0008] Preferably, the surface of the limiting rod is provided with threads, and a locking nut is threadedly connected to the surface of the limiting rod. The locking nut is disposed on the surface of the connecting block. By threading the locking nut to the surface of the limiting rod, the fixing frame can be limited.

[0009] Preferably, a fixing frame is fixedly connected to the surface of the arc-shaped plate, a support base is fixedly connected to the top of the fixing frame, and a second clamp is fixedly connected to both sides of the top of the support base. A first clamp is provided on the top of the second clamp. The first clamp and the second clamp cooperate to clamp the welding gun or the edge of the workpiece, realize the linkage and fixation of the drag cover and the welding operation component, ensure that the drag cover can stably follow the welding position during the welding process, and avoid insufficient coverage of the back protective gas due to the drag cover displacement.

[0010] Preferably, a fixing bolt is threadedly connected between the first clamp and the second clamp. Two of each type of clamp are provided, and the two clamps are symmetrically arranged. The fixing bolt clamps the first clamp and the second clamp through the threaded connection, thereby enhancing the clamping force on the clamped object (such as a welding gun or workpiece).

[0011] Preferably, the conveying mechanism includes a sealing gasket, which is fixedly connected to the left side of the surface of the back gas protection shroud body. The back gas protection shroud body is fixedly connected to an air inlet via the sealing gasket. The sealing gasket is elastic and can buffer the vibration when the air inlet is connected to the shroud body, while filling gaps to enhance sealing and prevent the protective gas (such as argon) from leaking from the connection.

[0012] Preferably, a delivery pipe is fixedly connected inside the air inlet, and an interface is fixedly connected to the bottom of the delivery pipe.

[0013] Compared with the prior art, this utility model provides a back gas shield for high-nitrogen steel argon arc welding, which has the following advantages:

[0014] 1. The back gas shield of the high nitrogen steel argon arc welding has an adjustment mechanism that adjusts the contact angle between the shield and the back of the weld, so that the shielding gas (argon) can tightly wrap the molten pool and heat-affected zone (HAZ) on the back of the weld, eliminating protection "dead corners" (such as the root of the groove and the blunt edge position).

[0015] 2. The back gas protection shroud of the high nitrogen steel argon arc welding has an elastic sealing gasket through a set conveying mechanism. This gasket can buffer the vibration when the air inlet is connected to the shroud body, and at the same time fill the gaps to enhance the sealing performance and prevent the protective gas (such as argon) from leaking from the connection part. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the adjustment mechanism of this utility model;

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the conveying mechanism of this utility model.

[0021] In the diagram: 1. Main body of the rear gas protection shroud; 2. Adjustment mechanism; 21. Support shaft; 22. Connecting plate; 23. Arc plate; 24. Limiting rod; 25. Connecting block; 26. Fixing frame; 27. Support base; 28. First clamp; 29. ​​Second clamp; 3. Conveying mechanism; 31. Interface; 32. Sealing gasket; 33. Conveying pipe; 34. Air inlet; 4. Skirt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides a technical solution:

[0024] Example 1:

[0025] Combination Figures 1 to 2 -3, a back gas shielding hood for high nitrogen steel argon arc welding, including a back gas shielding hood body 1, with skirts 4 fixedly connected to both sides of the bottom of the back gas shielding hood body 1, a conveying mechanism 3 provided on the top left side of the back gas shielding hood body 1, and an adjustment mechanism 2 provided on the top right side of the back gas shielding hood body 1.

[0026] The adjustment mechanism 2 includes a connecting plate 22, which is fixedly connected to the right side of the surface of the back gas protection shroud body 1. A connecting block 25 is fixedly connected to the surface of the connecting plate 22. A support shaft 21 is rotatably connected between the two connecting blocks 25. Arc-shaped plates 23 are fixedly connected to both sides of the surface of the support shaft 21. A limit rod 24 is fixedly connected to the surface of the arc-shaped plates 23.

[0027] Furthermore, an arc-shaped groove is provided in the connecting block 25, and the limiting rod 24 is slidably connected in the arc-shaped groove. Two limiting rods 24 are provided, and the two limiting rods 24 are symmetrically arranged. The arc-shaped groove provides a sliding trajectory for the limiting rod 24, which, together with the limiting rod 24, restricts the rotation range of the arc plate 23 and ensures that the trajectory of the arc plate 23 is stable when it rotates around the support shaft 21.

[0028] Furthermore, the surface of the limiting rod 24 is provided with threads, and a locking nut is threadedly connected to the surface of the limiting rod 24. The locking nut is provided on the surface of the connecting block 25. By threading the locking nut to the surface of the limiting rod 24, the fixing frame 26 can be limited.

[0029] Furthermore, a fixing frame 26 is fixedly connected to the surface of the arc plate 23, and a support base 27 is fixedly connected to the top of the fixing frame 26. A second clamp 29 is fixedly connected to both sides of the top of the support base 27. A first clamp 28 is provided on the top of the second clamp 29. The first clamp 28 cooperates with the second clamp 29 to clamp the welding gun or the edge of the workpiece, so as to realize the linkage and fixation of the drag cover and the welding operation component, ensuring that the drag cover can stably follow the welding position during the welding process, and avoiding insufficient coverage of the back shielding gas due to the drag cover displacement.

[0030] Furthermore, a fixing bolt is threadedly connected between the first clamp 28 and the second clamp 29. There are two of each of the first clamp 28 and the second clamp 29, and the two first clamps 28 and the second clamp 29 are arranged symmetrically. The fixing bolt clamps the first clamp 28 and the second clamp 29 through the threaded connection, thereby enhancing the clamping force on the clamped object (such as a welding gun or workpiece).

[0031] Example 2:

[0032] See Figure 4 Furthermore, based on Embodiment 1, the conveying mechanism 3 includes a sealing gasket 32. The sealing gasket 32 ​​is fixedly connected to the left side of the surface of the back gas protection shroud body 1. The back gas protection shroud body 1 is fixedly connected to an air inlet 34 through the sealing gasket 32. The sealing gasket 32 ​​is elastic and can buffer the vibration when the air inlet 34 is connected to the shroud body, while filling the gap to enhance the sealing performance and prevent the protective gas (such as argon) from leaking from the connection part.

[0033] Furthermore, a delivery pipe 33 is fixedly connected inside the air inlet 34, and an interface 31 is fixedly connected to the bottom of the delivery pipe 33.

[0034] In actual operation, when this device is used, the first clamp 28 is placed on the surface of the outer circular object, and the second clamp 29 is placed on the surface of the first clamp 28. Then, the fixing bolt is threaded between the first clamp 28 and the second clamp 29 to fix the back gas protection shroud body 1. When it is necessary to adjust the angle of the back gas protection shroud body 1, the fixing frame 26 can be rotated. At this time, the support shaft 21 rotates inside the connecting block 25, and the limiting rod 24 slides in the arc groove opened inside the connecting block 25. When the back gas protection shroud body 1 is adjusted to a suitable angle, the fixing frame 26 can be limited by threading the locking nut to the surface of the limiting rod 24, thereby realizing the adjustment of the angle of the back gas protection shroud body 1.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A back gas shield for argon arc welding of high-nitrogen steel, comprising a back gas shield body (1), characterized in that: The back gas protection hood body (1) has skirts (4) fixedly connected to both sides of the bottom. The back gas protection hood body (1) has a conveying mechanism (3) on the top left side and an adjustment mechanism (2) on the top right side. The adjustment mechanism (2) includes a connecting plate (22), which is fixedly connected to the right side of the surface of the back gas protection shroud body (1). A connecting block (25) is fixedly connected to the surface of the connecting plate (22), and a support shaft (21) is rotatably connected between the two connecting blocks (25). An arc plate (23) is fixedly connected to both sides of the surface of the support shaft (21), and a limit rod (24) is fixedly connected to the surface of the arc plate (23).

2. The back gas shield for high-nitrogen steel argon arc welding according to claim 1, characterized in that: The connecting block (25) has an arc-shaped groove, and the limiting rod (24) is slidably connected in the arc-shaped groove. There are two limiting rods (24), and the two limiting rods (24) are arranged symmetrically.

3. The back gas shield for high-nitrogen steel argon arc welding according to claim 1, characterized in that: The limiting rod (24) has a threaded surface, and a locking nut is threadedly connected to the limiting rod (24) surface. The locking nut is located on the surface of the connecting block (25).

4. The back gas shield for high-nitrogen steel argon arc welding according to claim 1, characterized in that: A fixing frame (26) is fixedly connected to the surface of the arc plate (23). A support base (27) is fixedly connected to the top of the fixing frame (26). A second clamp (29) is fixedly connected to both sides of the top of the support base (27). A first clamp (28) is provided on the top of the second clamp (29).

5. The back gas shield for high-nitrogen steel argon arc welding according to claim 4, characterized in that: The first clamp (28) and the second clamp (29) are connected by a threaded bolt. There are two of each of the first clamp (28) and the second clamp (29), and the two first clamps (28) and the second clamp (29) are arranged symmetrically.

6. The back gas shield for high-nitrogen steel argon arc welding according to claim 1, characterized in that: The conveying mechanism (3) includes a sealing gasket (32), which is fixedly connected to the left side of the surface of the back gas protection hood body (1). The back gas protection hood body (1) is fixedly connected to an air inlet (34) through the sealing gasket (32).

7. The back gas shield for high-nitrogen steel argon arc welding according to claim 6, characterized in that: A delivery pipe (33) is fixedly connected inside the air inlet (34), and an interface (31) is fixedly connected to the bottom of the delivery pipe (33).

Images