Titanium alloy curled edge welding seam welding protection dragging cover

Abstract

The utility model discloses a titanium alloy curled edge welding seam welding protection dragging cover which comprises a flexible buckle, a tightening screw, an air inlet rubber pipe, an air inlet connector, an upper shell, a side shell, a tail shell, an aluminum silicate cotton cushion, steel wool and an air outlet baffle. A flexible buckle is convenient to disassemble, a variable cross-section ventilation mode is adopted in the connecting position of an air inlet connector and an upper shell, protective gas can be evenly distributed to the periphery, a tail shell is provided with a through groove, it can be guaranteed that weld joints and heat affected zones on the two sides are located in an argon protective dragging cover, an aluminum silicate cotton pad is soft and resistant to high temperature, a welding gun is manually used during welding, resistance is avoided, air is effectively isolated, and the welding efficiency is improved. The steel wool can evenly divide protective gas into the whole dragging cover, and small ventilation holes are formed in the gas outlet baffle and used for isolating the steel wool from making contact with a hemming weld joint. The device is simple in structure and easy to manufacture, can quickly realize engineering application, and is matched with a conventional welding gun to solve the problem of material embrittlement in the titanium and titanium alloy welding process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to titanium alloy processing technical field, especially is titanium alloy hemming weld joint welding protection drag cover. BACKGROUND

[0002] Titanium and titanium alloy have the advantages of high specific strength, good plasticity and toughness, and good heat resistance and corrosion resistance, and are first applied in new aircraft and aeroengines. With the rapid development of space industry, titanium and titanium alloy are also increasingly widely used in the field of aerospace.

[0003] Titanium alloy material is relatively active in a hot state, so that the argon arc welding process thereof is special. During argon arc welding, the welded joint after absorbing harmful elements has a certain influence on the strength of the product, and the argon arc welding process of titanium alloy has certain differences from the argon arc welding processes of other aluminum and stainless steel.

[0004] Titanium has a high melting point, large heat capacity and poor thermal conductivity, and a large molten pool is easily formed during welding, and the high temperature of the molten pool makes the metal in the weld and heat affected zone stay at high temperature for a long time. The titanium and titanium alloy welded joint area is easily contaminated by impurities such as gas and produces embrittlement, and the main elements causing embrittlement are O, N, H, C, etc. Titanium and titanium alloy start to absorb H at 250 DEG C, rapidly absorb H above 300 DEG C, start to absorb O at 400 DEG C, rapidly absorb O above 600 DEG C, start to absorb N at 600 DEG C, and rapidly absorb N at 700 DEG C. With the increase of temperature, the ability of titanium and titanium alloy to absorb N, H and O increases obviously. O and N form interstitial solid solution in Ti, which has a solid solution strengthening effect, causes lattice distortion of titanium, and increases the strength and hardness, but significantly reduces the plasticity and toughness.

[0005] Especially for the hemming weld joint, as shown in the figure, the hemming weld joint is formed by welding two L-shaped structural members, and the heat affected zone of the weld is at the lower end of the weld, so it is difficult for a single welding gun to protect the heat affected zone, and therefore, it is necessary to design a reasonable protection drag cover for the titanium alloy hemming weld joint to quickly realize engineering application and reduce the embrittlement problem of the material during the welding process of titanium and titanium alloy. Figure 3 SUMMARY The utility model discloses a titanium alloy hemming weld joint welding protection drag cover, which provides sufficient protection for the titanium alloy hemming weld joint, and has a simple structure and simple manufacturing method.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A titanium alloy hemming weld joint welding protection drag cover comprises:

[0008] A titanium alloy hemming weld joint welding protection drag cover comprises:

[0009] a shell comprising a cavity capable of accommodating a crimped weld joint, an opening for placing the crimped weld joint into the cavity, and a mounting groove connected with a torch tip of a welding torch;

[0010] an air inlet hose connected to the shell through an air inlet connector and communicating with the cavity;

[0011] an aluminum silicate cotton pad mounted on the shell and distributed on both sides of the crimped weld joint;

[0012] an air outlet baffle mounted in the cavity of the shell and above the crimped weld joint, the air outlet baffle having a plurality of air outlet holes evenly spaced thereon;

[0013] steel wool filled in the cavity of the shell and located in the space between the air outlet baffle and the inner wall of the cavity of the shell.

[0014] Further, the titanium alloy crimped weld joint welding protection cover further comprises a flexible buckle fixed at the mounting groove of the shell and binding the torch tip at the mounting groove of the shell by tightening a screw.

[0015] Further, the shell comprises:

[0016] an upper shell having a notch at one end for accommodating the torch tip, and the air inlet hose being connected to the upper shell through an air inlet connector;

[0017] two side shells connected to the two ends of the upper shell in the width direction, each of the side shells having an aluminum silicate cotton pad mounted thereon;

[0018] two tail shells connected to the two ends of the upper shell in the length direction, one of the tail shells having a concave surface for accommodating the torch tip, and the other tail shell having a tail shell through slot for avoiding the crimped weld joint.

[0019] As an option, the air inlet connector has a variable cross-section, and the cross-sectional area gradually decreases from the end connected to the shell to the end connected to the air inlet hose.

[0020] As an option, the steel wool has a diameter of 0.02mm to 0.1mm.

[0021] As an option, the air outlet holes on the air outlet baffle have a diameter of 1mm and are evenly distributed with a spacing of 2mm.

[0022] As an option, the connections between the upper shell, the side shells and the tail shells are covered with a sealing tin foil.

[0023] Compared with the prior art, the protective shroud is simple in manufacture, the shell forms a closed space capable of covering the edge weld joint to the heat affected zone at the lower end of the weld, thereby adapting to the welding structure of the titanium alloy edge weld. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a protective shroud structure diagram of the edge weld;

[0025] Figure 2 is a schematic diagram of the protective shroud inside;

[0026] Figure 3 is a schematic diagram of the state of the welding gun welding titanium alloy edge weld using the protective shroud;

[0027] In the figure: 1-flexible buckle, 2-tightening screw, 3-welding gun porcelain nozzle, 4-welding gun, 5-gas inlet hose, 6-gas inlet joint, 7-upper shell, 8-lateral shell, 9-tail shell, 10-silica alumina cotton pad, 11-steel wool, 12-gas outlet baffle, 13-tail shell through slot, 14-edge weld joint. DETAILED DESCRIPTION

[0028] The utility model will be further described below in combination with the drawings and specific embodiments, but should not be understood as the scope of the subject matter described in the utility model is limited to the following examples, without departing from the above technical thought of the utility model, all kinds of modifications, replacements and changes according to the ordinary technical knowledge and conventional means in the art are included in the scope of the utility model.

[0029] As Figures 1-3 shown, it is a kind of titanium alloy edge weld welding protective shroud designed by the utility model, including flexible buckle 1, tightening screw 2, gas inlet hose 5, gas inlet joint 6, upper shell 7, lateral shell 8, tail shell 9, silica alumina cotton pad 10, steel wool 11 and gas outlet baffle 12.

[0030] The upper shell 7, the side shell 8 and the tail shell 9 form an overall shell with an open lower end, which contains a cavity capable of accommodating the crimped weld joint 14, an opening for placing the crimped weld joint 14 into the cavity, and a mounting groove connected to the welding gun nozzle 3 on the welding gun 4. Specifically, one end of the upper shell 7 is provided with a notch for accommodating the welding gun nozzle 3, and the air inlet hose 5 is connected to the upper shell 7 through the air inlet joint 6 and communicates with the cavity. The two side shells 8 are respectively connected to the two ends of the upper shell 7 in the width direction and extend towards the lower end of the crimped weld joint 14, and each side shell 8 is provided with an aluminum silicate cotton pad 10, so that the two aluminum silicate cotton pads 10 are distributed on both sides of the crimped weld joint 14. The two tail shells 9 are respectively connected to the two ends of the upper shell 7 in the length direction, one of which forms a recessed profile for accommodating the welding gun nozzle 3, and the recessed profile and the notch on the upper shell 7 together form a mounting groove for the welding gun nozzle 3, and the other tail shell 9 is provided with a tail shell through slot 13 which avoids the crimped weld joint 14.

[0031] The flexible buckle 1 is a metal strip, and the two free ends of the strip are connected together by tightening the screws 2 to be bound to the surface of the welding gun nozzle 3. The flexible buckle 1 is welded to the mounting groove formed by the tail shell 9 and the upper shell 7, specifically, it is welded to the surface of the tail shell 9, and then the two free ends of the flexible buckle 1 are folded together by tightening the screws 2 to bind the welding gun nozzle 3 to the mounting groove of the shell.

[0032] The air outlet baffle 12 is installed in the cavity of the shell and above the crimped weld joint 14, and a plurality of air outlet holes are evenly arranged on the air outlet baffle 12. The steel wool 11 is filled in the cavity of the overall shell formed by the upper shell 7, the side shell 8 and the tail shell 9, and is located in the space between the air outlet baffle 12 and the inner wall of the cavity of the shell.

[0033] The flexible buckle 1 is convenient to disassemble, the connection between the air inlet joint 6 and the upper shell 7 adopts a variable cross-section air passage mode, which can evenly divide the protective gas (such as argon) introduced at the inlet end to the four sides of the cavity. The tail shell 9 is provided with a tail shell through slot 13 at the lower end, which can ensure that the crimped weld joint 14 and the heat-affected zone on both sides are in the protective cover. The aluminum silicate cotton pad 10 is soft and resistant to high temperature, and there is no resistance when the welding gun 4 is manually used during welding, and it effectively isolates air. The steel wool 11 can evenly distribute the protective gas at the air inlet end to the entire cover. The air outlet holes designed on the air outlet baffle 12 also serve to isolate the steel wool 11 from contacting the crimped weld joint 14. The diameter of the steel wool 11 is selected between 0.02mm and 0.1mm, and the diameter of the air outlet holes on the air outlet baffle 12 is 1mm, and the spacing is evenly distributed at an interval of 2mm. The connection positions between the upper shell 7, the side shell 8 and the tail shell 9 are sealed with adhesive tin foil paper to avoid air leakage at the non-front side (here referring to the side facing the crimped weld joint 14) of the protective cover.

[0034] The design and manufacturing method of the protective shroud for the titanium alloy crimped weld is as follows:

[0035] Step 1: design the protective shroud according to the structural characteristics of the titanium alloy crimped weld, for example, the crimped weld joint 14 shown in FIG. 1 is composed of two L-shaped structures, so the protective shroud is designed in the form of the tail shell 9 with the tail shell through slot 13, and the silica alumina cotton pad 10 is installed on the outside of the side shell 8; Figure 3

[0036] Step 2: cut the parts of the protective shroud, including the flexible buckle 1, the upper shell 7, the side shell 8, the tail shell 9 and the gas baffle 12, by laser cutting;

[0037] Step 3: form the protective shroud by welding the upper shell 7, the side shell 8, the tail shell 9 and the flexible buckle 1 in the form of argon arc welding with wire filling and self-melting;

[0038] Step 4: fill the steel wool 11 with a diameter of 0.02mm-0.1mm in the protective shroud and weld the gas baffle 12;

[0039] Step 5: rivet the silica alumina cotton pad 10 on the side shell 8;

[0040] Step 6: bind the protective shroud to the welding gun porcelain nozzle 3 of the welding gun 4 through the flexible buckle 1 and the tightening screw 2, adjust the position of the protective shroud and lock the tightening screw 2.

[0041] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed in the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A titanium alloy crimped weld shield characterized by, The utility model relates to a welding gun protection device, which comprises: a shell containing a cavity capable of accommodating a crimped welding joint (14), an opening for placing the crimped welding joint (14) into the cavity, and a mounting groove connected with a welding gun nozzle (3) on a welding gun (4); an air inlet rubber tube (5) connected with the shell through an air inlet joint (6) and communicating with the cavity; an aluminum silicate cotton pad (10) mounted on the shell and distributed on both sides of the crimped welding joint (14); an air outlet baffle (12) mounted in the cavity of the shell and located above the crimped welding joint (14), the air outlet baffle (12) being provided with a plurality of air outlet holes at equal intervals; steel wool (11) filled in the cavity of the shell and located in the space between the air outlet baffle (12) and the inner wall of the cavity of the shell.

2. A protective shroud for titanium alloy crimped welds according to claim 1, wherein, The utility model further comprises a flexible buckle (1) fixed at the mounting groove of the shell and binding the welding gun nozzle (3) at the mounting groove of the shell by tightening a screw (2).

3. A protective shroud for titanium alloy crimped welds as defined in claim 1, wherein, The shell comprises: an upper shell (7) having a notch at one end for accommodating the welding gun nozzle (3), and the air inlet rubber tube (5) being connected with the upper shell (7) through the air inlet joint (6); two side shells (8) connected with the two ends in the width direction of the upper shell (7) respectively, and each side shell (8) being provided with an aluminum silicate cotton pad (10); two tail shells (9) connected with the two ends in the length direction of the upper shell (7) respectively, one of the tail shells (9) forming a recessed profile for accommodating the welding gun nozzle (3), and the other tail shell (9) being provided with a tail shell through slot (13) avoiding the crimped welding joint (14).

4. A protective shroud for titanium alloy crimped welds as defined in claim 1, wherein: The air inlet joint (6) has a variable cross-section, and the cross-sectional area gradually decreases from the end connected with the shell to the end connected with the air inlet rubber tube (5).

5. A protective shroud for titanium alloy crimped welds as defined in claim 1, wherein: The diameter of the steel wool (11) is 0.02mm-0.1mm.

6. A protective shroud for titanium alloy crimped welds as defined in claim 1, wherein: The diameter of the air outlet hole on the air outlet baffle (12) is 1mm, and the air outlet holes are uniformly distributed with a spacing of 2mm.

7. A protective shroud for titanium alloy crimped welds as defined in claim 3, wherein: The connection between the upper shell (7), the side shells (8) and the tail shells (9) is covered with a tin foil for sealing.

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