Gas protection device for welding
By designing a gas shield to cover the back of the weld and using shielding gas to cover the heat-affected zone of the weld, the problem of insufficient protection of the back of the weld is solved and the quality of the weld is improved.
Patent Information
- Application Number
- CN202422430019.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-09
AI Technical Summary
In existing welding technology, the back side of the weld is difficult to be effectively protected, resulting in quality defects such as oxidation, embrittlement and cracks.
A gas shield is designed, which is connected to a protective gas storage device through a gas pipe joint. The gas shield is used to cover the back of the weld and the welding heat affected zone. The wire mesh and sealing layer inside the gas shield are used to ensure uniform gas distribution.
Effectively reduce the risk of weld oxidation, improve weld quality, and reduce defects such as embrittlement and cracks.
Smart Images
Figure CN223301032U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of welding equipment, and in particular relates to a gas protection device for welding. Background Art
[0002] Welding, also known as fusion, is a manufacturing process and technology that uses heat, high temperature, or high pressure to join metals or other thermoplastic materials, such as plastics. Welding is a critical step in the manufacturing process. To prevent the weld from reacting with oxygen and nitrogen in the air at high temperatures, a shielding gas is used during the welding process. This prevents oxidation and nitridation of the weld, ensuring weld quality and performance.
[0003] Nowadays, argon gas is usually sprayed from the welding gun nozzle to isolate the oxidation effect of air on the weld and heat-affected zone. However, this method has great limitations. The argon gas sprayed from the welding gun nozzle can only cover part of the front area of the weld. The protection range is small and the argon gas cannot accumulate, and cannot provide complete protection for the weld and its heat-affected zone. In particular, the back of the weld is often difficult to take care of, and it is easy to form welding defects such as embrittlement, porosity, and cracks after welding. Utility Model Content
[0004] The utility model aims to provide a gas protection device for welding, which reduces the oxidation risk of the back of the weld during the welding process and improves the quality of the weld.
[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a gas protection device for welding, comprising a gas protection hood and an air pipe joint, an L-shaped opening is provided on one side of the gas protection hood, an L-shaped laminar plate is provided at the L-shaped opening, and a plurality of through holes are provided on the L-shaped laminar plate; the air pipe joint is connected to the interior of the gas protection hood, and the air pipe joint is used to connect a protective gas storage device; the two sides of the L-shaped opening are used to rest against two parts to be welded, and are located on the back of the welding position.
[0006] Furthermore, a connecting rod is fixed on the gas protection cover.
[0007] Furthermore, several layers of wire mesh are provided inside the gas protection cover.
[0008] Furthermore, the gas shield is used to abut against two parts to be welded and is provided with sealing layers on both sides.
[0009] Furthermore, extended side panels are provided around the L-shaped opening.
[0010] The working principle of this technical solution is:
[0011] Hold the connecting rod and use it to snap the gas shield onto the back of the weld. Place the two sides of the shield firmly against the two parts to be welded. Before welding begins, open the shielding gas reservoir to allow the shielding gas to quickly and evenly fill the shield, covering the heat-affected zone. After welding is complete and the temperature of the weld has dropped below 100°C, remove the shielding gas reservoir and move to the next weld. Repeat the above steps until welding is complete.
[0012] The beneficial effects of this technical solution are:
[0013] The shielding gas storage device is connected via a gas pipe connector, allowing the gas shield to be filled with shielding gas. During welding, the shield covers the back of the weld to be welded, allowing the shielding gas to reach the weld pool surface and cover the heat-affected zone. This significantly reduces the weld surface's exposure to air, lowering the risk of oxidation during welding and improving weld quality. This solves the existing problem of insufficient backside protection during welding, which can lead to quality defects such as embrittlement, porosity, and cracks. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of a welding gas protection device according to the present invention;
[0015] Figure 2 This is a schematic structural diagram of the bottom of a welding gas protection device according to the present invention;
[0016] Figure 3 for Figure 1 The main view;
[0017] Figure 4 for Figure 1 Left sectional view of
[0018] Figure 5 The utility model is a structural schematic diagram of a welding gas protection device when in use. DETAILED DESCRIPTION
[0019] The following is further described in detail through specific implementation methods:
[0020] The reference numerals in the drawings of the specification include: gas protection cover 1, L-shaped laminar flow plate 2, extended side plate 3, connecting joint 4, gas pipe joint 5, wire mesh 6, connecting rod 7.
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] The embodiment is basically as shown in the attached Figure 1-5 As shown: A gas protection device for welding, which can be used for welding protection of pressure vessels, and can also be used for welding protection of simple tube and shell structures. The material can be titanium alloy, stainless steel, carbon steel, etc. The overall structure includes a gas protection hood 1 and a gas pipe joint 5. The gas protection hood 1 can be a square box structure or a cylindrical structure. An L-shaped opening is provided on one side of the upper side of the gas protection hood 1, and an L-shaped laminar plate 2 is provided at the L-shaped opening. The L-shaped laminar plate 2 is provided with a plurality of through holes. The interior of the gas protection hood 1 is provided with a plurality of layers of wire mesh 6 (specifically, corrugated metal wire mesh 6). Extended side panels 3 are provided around the L-shaped opening. The two sides of the L-shaped opening are used to abut against the two parts to be welded, and are located on the back of the welding position. The two sides of the gas protection hood 1 used to abut against the two parts to be welded are provided with a sealing layer (specifically, Teflon high-temperature tape). A tracheal connector 5 and a connecting connector 4 are provided on the underside of the gas shield 1. The tracheal connector 5 communicates with the interior of the gas shield 1 and is used to connect to a protective gas storage device (specifically, an argon cylinder). The outlet of the protective gas storage device is equipped with a gas outlet check valve. Connecting connector 4 is fixedly connected to a connecting rod 7. The overall shape of the connecting rod 7 is determined according to specific requirements and can be a support rod or an L-shaped rod.
[0023] The gas shield 1, the extended side plate 3, the L-shaped laminar flow plate 2, the gas pipe joint 5, and the connecting joint 4 can be made of copper, brass, or stainless steel, wherein copper is more suitable for a welding environment.
[0024] The specific implementation process is as follows:
[0025] Hold the connecting rod 7 in your hand, and then use the connecting rod 7 to snap the gas shield 1 onto the back of the weld. The two sides of the gas shield 1 are respectively pressed against the two parts to be welded. Before welding begins, open the shielding gas storage device so that the shielding gas quickly and evenly fills the gas shield 1, covering the heat-affected zone of the weld. After welding is completed, wait until the welding of this section of the weld is completed and the temperature drops to below 100°C, move the gas shield device away to the position of the next weld section, and repeat the above steps until welding is completed. When the pressure in the argon cylinder drops to 0.5MPa, the cylinder should be replaced immediately to prevent affecting the quality of the weld joint.
[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0027] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A gas shielding device for welding, characterized in that: The invention comprises a gas protective cover (1) and an air pipe joint (5), wherein an L-shaped opening is provided on one side of the gas protective cover (1), an L-shaped laminar flow plate (2) is provided at the L-shaped opening, and a plurality of through holes are provided on the L-shaped laminar flow plate (2); the air pipe joint (5) is communicated with the interior of the gas protective cover (1), and the air pipe joint (5) is used to connect to a protective gas storage device; and both sides of the L-shaped opening are used to abut against two parts to be welded and are located on the back side of the welding position.
2. A welding gas shielding device according to claim 1, characterized in that: A connecting rod (7) is fixed on the gas protection cover (1).
3. A welding gas shielding device according to claim 1, characterized in that: Several layers of wire mesh (6) are provided inside the gas protection cover (1).
4. A welding gas shielding device according to claim 1, characterized in that: The gas protection cover (1) is used for contacting with two parts to be welded and is provided with sealing layers on both sides.
5. A welding gas shielding device according to claim 1, characterized in that: Extended side panels (3) are provided around the L-shaped opening.