Gas protection device for back of fillet weld of connecting pipe
By designing a gas protection device for the back of the fillet weld, the problem of unstable protective atmosphere on the back of the weld was solved, achieving uniform protection, cost reduction, and improved weld quality.
Patent Information
- Application Number
- CN202520286571.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-21
AI Technical Summary
During the welding process of fillet welds, it is difficult to construct a stable protective atmosphere on the back side of the weld. Existing protective gases consume a large amount of gas and are costly, making it difficult to obtain excellent weld quality.
A gas protection device for the back of a fillet weld in a pipe assembly is designed, comprising a gas flow device, a weld fitting mechanism, a clamping ring, a gas dispersion device, a fixing ring, and a gas backflow regulator. These components form a uniform protective atmosphere and reduce gas consumption.
It achieves a uniform protective atmosphere on the back of the weld, reduces gas consumption, improves weld quality and reduces costs, and is simple to operate and highly versatile.
Smart Images
Figure CN223903290U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to welding technical field especially relates to a pipe joint fillet weld back gas protection device. BACKGROUND
[0002] Pipe joint fillet weld is one of widely used welding joint forms, is widely used in boiler, pressure vessel and other products, relates to a variety of non-alloy steel, alloy steel, stainless steel and other materials, for some more special materials, such as 91, stainless steel etc., in order to obtain more excellent weld quality and weld forming in the welding process, need to use protective gas to protect the back of weld, such as the welding process of full penetration pipe joint fillet weld structure, requires single-sided welding double-sided forming, to obtain quality qualified, the weld of excellent forming, the gas protection environment of the back of weld has higher requirements, especially adopts tungsten inert gas welding method.
[0003] In addition, due to the structural characteristics of pipe joint fillet weld, it is difficult to construct a good, stable protective atmosphere on the back of weld in actual production, and in some specific cases, the entire workpiece needs to be blocked and inert gas is introduced to fill the entire workpiece, leaving an opening only at the position to be welded to achieve the effect of inert gas protection. However, this way of protection has limited effect and high consumption of protective gas, which is costly. UTILITY MODEL CONTENTS
[0004] To solve the above technical problems, the utility model designs a pipe joint fillet weld back gas protection device.
[0005] The utility model adopts the following technical scheme:
[0006] A pipe joint fillet weld back gas protection device is used for pipe joint fillet weld structure, which includes a pipe joint and a main workpiece. The pipe joint and the main workpiece have an assembly gap therebetween. The protection device includes a gas flow device, a weld fitting mechanism, a clamping ring, a gas dispersion device, a fixing ring, a gas return regulator, and a gas pipe. The weld fitting mechanism is installed on the gas flow device. The clamping ring is installed in the annular groove on the weld fitting mechanism and can be clamped and fixed with the inner wall of the main workpiece. The gas dispersion device is installed on the gas outlet of the weld fitting mechanism and is fixed by the fixing ring. The gas return regulator is installed at the tail of the gas flow device and can control the outflow of gas by adjusting the position through threads. The protective gas enters the device from the gas inlet of the gas flow device through the gas pipe, escapes from the gas dispersion device position through the gas flow device and the weld fitting mechanism, and forms a relatively uniform protective atmosphere on the back of the pipe joint weld. Part of the protective gas escapes from the gap between the pipe joint and the main workpiece, and the other part continues to flow into the pipe joint and finally flows out from the gas return regulator through the return pipe in the center of the gas flow device.
[0007] As a preferred, the gas flow device is a multi-chamber tubular metal structure, including a gas inlet pipe, a shell, a gas guide pipe, a center pipe, an end plug, a tail threaded plug, the shell is fixed with the gas guide pipe and forms a first gas chamber, the gas guide pipe is fixed with the end plug and the center pipe to form a second gas chamber, the gas inlet pipe is connected with the shell and communicates with the first gas chamber, and the gas inlet pipe communicates with the gas pipe. The preferred solution is to use stainless steel material.
[0008] As a preferred, the inner end of the shell is provided with a thread, and the end of the thread is provided with a limiting step higher than the thread.
[0009] As a preferred, the gas guide pipe is a tubular porous structure, which is connected with the center pipe, the shell and the end plug by welding, and a plurality of rows of holes are uniformly distributed on the circumference of the gas guide pipe. The preferred solution is a waist round hole.
[0010] As a preferred, the end plug is cylindrical, the outer diameter is matched with the inner diameter of the gas guide pipe and is connected by welding, one end is provided with a thread, the center is provided with a through hole, the inner diameter is matched with the outer diameter of the center pipe and is connected by welding.
[0011] As a preferred, the center pipe is a straight pipe, which is fixed with the shell, the gas guide pipe and the end plug by welding, one end is open, the other end is fixed with the tail threaded plug by welding, a hole is arranged on the circumference near the tail threaded plug, the tail threaded plug is connected with the gas return flow regulator through threads, the gas return flow regulator is a hollow structure, one end is provided with a thread and matched with the tail threaded plug, the other end is matched with the outer diameter of the center pipe. The preferred solution of the gas return flow regulator is a smooth surface and the length can cover the hole of the center pipe, the shape is cylindrical and the outer surface is provided with diagonal lines to increase the friction.
[0012] As a preferred, the welding seam matching mechanism is a multi-layer step metal cup structure, which can be configured in multiple specifications according to the actual size of the workpiece, one end has a cover and a threaded hole in the center, the thread is matched with the end plug, the inside is hollow and the inner wall has a thread, the thread is matched with the shell, the welding seam matching mechanism is assembled with the gas flow device and forms a third gas chamber. The preferred solution is to use a three-step structure, the material is stainless steel, the first step is provided with a through hole and a limiting slot on the circumference, the end has a chamfer, the second step is smaller than the inner diameter of the main workpiece hole by 1-2mm, and has a ring slot, and the third step is larger than the inner diameter of the main workpiece hole by about 5mm.
[0013] As a preferred, the clamping ring is a high-elasticity split ring with a trapezoidal structure. The preferred solution is that the outer diameter of the initial state is slightly larger than the inner diameter of the main workpiece hole by 1-2mm, and the minimum outer diameter after contraction is slightly smaller than the inner diameter of the main workpiece hole.
[0014] As a preferred, the gas diffusion mechanism is annular porous metal. The preferred solution is a whole annular mesh composed of multiple layers of thin stainless steel mesh, the outer diameter of which is substantially consistent with the second step in the weld joint fitting mechanism.
[0015] As a preferred, the fixed ring is a high-elasticity split ring, and the gas pipe is a flexible pipe. The preferred solution is that the gas pipe adopts a high-temperature-resistant plastic flexible pipe.
[0016] The beneficial effects of the present application are: (1) The present application is suitable for full penetration pipe fillet weld structure, can make the protective gas flow through the weld back and form a stable and continuous atmosphere, thereby obtaining a better weld quality; (2) The present application can effectively reduce the use amount of protective gas and reduce the manufacturing cost; (3) The present application is simple to operate and has high versatility due to the modular design. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a schematic diagram of explosion decomposition of the present application;
[0018] Figure 2 is a schematic diagram of structure of the present application;
[0019] Figure 3 is a schematic diagram of gas flow of the present application
[0020] In the figure: 1, gas flow device, 2, weld joint fitting mechanism, 3, clamping ring, 4, gas diffusion device, 5, fixed ring, 6, gas backflow regulator, 7, gas pipe, 12, gas inlet pipe, 11, shell, 13, gas guide pipe, 14, end plug, 15, center pipe, 16, tail threaded plug, F, gas flow direction, I, first gas chamber, II, second gas chamber, III, third gas chamber, WP1, main workpiece, WP2, connecting pipe. DETAILED DESCRIPTION
[0021] The technical solutions of the present application will be further described in detail below by specific embodiments and in combination with the drawings:
[0022] Embodiment: As shown in Figure 1 , Figure 2 A connecting pipe fillet weld back gas protection device, including a gas flow device 1, a weld joint fitting mechanism 2, a clamping ring 3, a gas diffusion device 4, a fixed ring 5, a gas backflow regulator 6, a gas pipe 7, a gas inlet pipe 12, a shell 11, a gas guide pipe 13, an end plug 14, a center pipe 15, and a tail threaded plug 16.
[0023] The weld seam fitting mechanism 2 is installed on the gas flow device 1 via a threaded connection. The clamping ring 3 is installed in the annular groove on the weld seam fitting mechanism 2. The gas dispersion device 4, which has a certain degree of elasticity, can be fitted onto the weld seam fitting mechanism 2 and fixed with a retaining ring 5, forming the weld seam fitting mechanism 2 assembly. The gas backflow regulator 6 is installed on the tail threaded plug 16, and its position can be adjusted by rotating it to change the size of the opening at the tail of the central tube 15, thus achieving the adjustment function.
[0024] The connection between the air inlet pipe 12, the outer shell 11, the air guide pipe 13, the end plug 14, and the central pipe 15 is made by sealing welding to form a gas flow device 1 assembly, and the hose 7 is fitted onto the air inlet pipe 12.
[0025] A complete set of equipment also includes a gas supply system, etc.
[0026] Instructions for using this device:
[0027] Before using the device, such as Figure 1 As shown, first assemble and position the main workpiece WP1 and the connecting pipe WP2. Select the weld fitting mechanism 2 component that matches the main workpiece WP1 and install it on the gas flow device 1 component. Install the gas pipe 7 on the inlet pipe 12 and secure it with steel wire, clamps, etc. Align the device with the assembled workpiece and insert it forcefully, causing the clamping ring 3 to deform and adhere to the inner wall of the main workpiece WP1. Gas is introduced, and the gas enters the device from the gas pipe 7, passing through the first gas chamber I composed of the outer shell 11, the gas guide pipe 13, and the central pipe 15, then through the second gas chamber II composed of the gas guide pipe 13 and the central pipe 15, and then into the third gas chamber II composed of the weld fitting mechanism 2 and the gas guide pipe 13. The gas flows out from the gas dispersion device 4, part of which flows out from the bevel position, and part of which flows out from the pipe opening or through the central pipe 15 from the opening of the gas return regulator 6. Figure 3 As shown. Then adjust the gas flow rate and gas reflux regulator 6 to create a more ideal protective atmosphere at the position of the gas dispersion device 4.
[0028] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.
Claims
1. A back gas welding apparatus for a nozzle fillet joint structure, the nozzle fillet joint structure comprising a nozzle, a main workpiece, characterized by, The protection device comprises a gas flow device, a weld seam matching mechanism, a clamping ring, a gas diffusion device, a fixing ring, a gas backflow regulator and a gas pipe, the weld seam matching mechanism is installed on the gas flow device, the clamping ring is installed in the annular groove on the weld seam matching mechanism and can be clamped and fixed with the inner wall of the main workpiece, the gas diffusion device is installed on the gas outlet of the weld seam matching mechanism and is fixed by the fixing ring, the gas backflow regulator is installed at the tail of the gas flow device and can control the outflow of the gas by adjusting the position through the thread, the protection gas enters the device from the gas inlet of the gas flow device, escapes from the position of the gas diffusion device through the gas flow device and the weld seam matching mechanism, forms a relatively uniform protective atmosphere on the back of the weld seam of the connecting pipe, and part of the protection gas escapes from the gap between the connecting pipe and the main workpiece and the other part continues to flow into the connecting pipe and finally flows out from the gas backflow regulator through the backflow pipe in the center of the gas flow device.
2. A back gas protection device for a nozzle fillet according to claim 1, characterized in that The gas flow device is a tubular metal structure with multiple chambers, comprising a gas inlet pipe, a shell, a gas guide pipe, a center pipe, an end plug and a tail threaded plug, the shell is fixed with the gas guide pipe and forms a first gas chamber, the gas guide pipe is fixed with the end plug and the center pipe to form a second gas chamber, the gas inlet pipe is connected with the shell and communicates with the first gas chamber, and the gas inlet pipe communicates with the gas pipe.
3. A back gas protection apparatus for a nozzle fillet according to claim 2, wherein The inner end of the shell is provided with a thread, and the end of the thread is provided with a limiting step higher than the thread.
4. A back gas protection device for a nozzle fillet according to claim 2, wherein The gas guide pipe is a tubular porous structure, which is connected with the center pipe, the shell and the end plug by welding, and a plurality of rows of holes are uniformly distributed on the circumference of the gas guide pipe.
5. A back gas protection device for a nozzle fillet as defined in claim 2, wherein The end plug is cylindrical, the outer diameter of the end plug is matched with the inner diameter of the gas guide pipe and is connected by welding, one end of the end plug is provided with a thread, the center of the end plug is provided with a through hole, the inner diameter of the through hole is matched with the outer diameter of the center pipe and is connected by welding.
6. A back gas protection device for a nozzle fillet as defined in claim 2, wherein The center pipe is a straight pipe, which is fixed with the shell, the gas guide pipe and the end plug by welding, one end of the center pipe is open, the other end of the center pipe is fixed with the tail threaded plug by welding, a hole is arranged on the circumference near the tail threaded plug, the tail threaded plug is threadedly connected with the gas backflow regulator, and the gas backflow regulator is a hollow structure, one end of the gas backflow regulator is provided with a thread and is matched with the tail threaded plug, and the other end of the gas backflow regulator is matched with the outer diameter of the center pipe.
7. A back gas protection device for a nozzle fillet as defined in claim 2, wherein The weld seam matching mechanism is a multi-step metal cup structure, which can be configured in multiple specifications according to the actual size of the workpiece, one end of the weld seam matching mechanism is provided with a cover and a threaded hole in the center, the thread of the weld seam matching mechanism is matched with the end plug, the inside of the weld seam matching mechanism is hollow and the inner wall of the weld seam matching mechanism is provided with a thread, the thread of the weld seam matching mechanism is matched with the shell, the weld seam matching mechanism is assembled with the gas flow device and forms a third gas chamber.
8. A back gas protection apparatus for a nozzle fillet as defined in claim 1, wherein The clamping ring is a high-elastic open ring with a trapezoidal structure in cross section.
9. A back gas protection apparatus for a nozzle fillet as defined in claim 1, wherein The gas diffusion mechanism is a ring-shaped porous metal.
10. A back gas protection apparatus for a nozzle fillet as defined in claim 1, wherein The fixing ring is a high-elastic open ring, and the gas pipe is a flexible pipe.