Special material test plate welding protection device

Abstract

The utility model discloses a special material test plate welding protection device. The air groove is longitudinally formed in the top face of the tool rack, the back face air protection sliding block covers the top of the air groove in a pressing mode, the supporting legs are arranged at the bottom of the tool rack, two cooling channels are formed in the tool rack, and cooling channel inlets and outlets are formed in the left side and the right side of the tool rack. The bottom face of the tool rack is connected with a back face shielding gas inlet, flow stabilizing holes are distributed in the back face shielding sliding block, and the test plate is arranged on the back face shielding sliding block of the tool rack. The method has the advantages that the protective gas is saved, the gas replacement efficiency is high, the gas purity after replacement is high, and the problems that the test panel absorbs oxygen, hydrogen and nitrogen due to the fact that air on the back face of a weld joint is not exhausted completely and the protective gas on the back face is not pure when the special material test panel is welded are effectively solved; and the problem that the consumption of back protection gas is large when the special material test plate is welded is also solved. The problems that the cooling speed is low and the welding waiting time is long when the special material test plate is welded are effectively solved.

Description

Technical Field

[0001] The utility model relates to a special material welding protection device, in particular to a special material test plate welding protection device. Background Art

[0002] With the development of industrial technology, non-ferrous metals and precious metals (titanium, zirconium, niobium, tantalum, etc., hereinafter collectively referred to as special materials) are increasingly used in pressure vessels and heat exchangers. Before equipment manufacturing, welding process assessment is required to verify whether the welding process meets the requirements. However, during the process assessment, due to poor gas protection, the test plate will absorb oxygen, hydrogen, nitrogen, etc., which will reduce the mechanical properties and corrosion resistance, resulting in failure of mechanical tests and corrosion tests. Failure of process assessment will affect subsequent equipment manufacturing and cause significant economic losses.

[0003] At present, most manufacturers usually adopt the ventilation protection of the front and back drag shield + welding gun protection when welding precious metal test plates. This method has the disadvantages of easy deformation of the test plate, easy oxidation of the weld, high consumption of back shielding gas, and slow cooling speed. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a special material test plate welding protection device which can effectively avoid problems such as test plate deformation, weld oxidation, large back shielding gas consumption and slow cooling speed.

[0005] In order to solve the above technical problems, the special material test plate welding protection device of the present invention includes a tooling stand used as a carrier for the test plate, an air groove longitudinally opened on the top surface of the tooling stand, a back air protection slider pressed on the top of the air groove, and a support leg arranged at the bottom of the tooling stand. Two cooling channels are provided in the tooling stand, respectively located on one side of the air groove. Cooling channel inlets and outlets for introducing cooling medium into the cooling channels are provided on the left and right sides of the tooling stand. A back protective gas inlet for introducing protective gas into the air groove is connected to the bottom surface of the tooling stand. Flow stabilization holes are arranged on the back air protection slider, and the test plate is placed on the back air protection slider of the tooling stand.

[0006] A test plate fixing device for fixing the test plate is provided at the edge of the tooling stand, and the test plate is pressed and fixed on the tooling stand by the test plate fixing device.

[0007] The air groove is composed of a hollow groove with a trapezoidal cross-section structure and a placement groove with a rectangular cross-section structure connected to the upper section of the hollow groove, and the back air protection sliding block is placed in the placement groove.

[0008] The two cooling channels are arranged in parallel on both sides of the air groove.

[0009] The tooling stand is made of aluminum alloy material.

[0010] The back gas protection sliding block is a copper block.

[0011] The cooling medium is water or nitrogen.

[0012] The test plate fixing device comprises a C-shaped frame, a pressure arm provided on the top arm of the C-shaped frame, and a compression nut screwed on the pressure arm.

[0013] The supporting legs are detachable.

[0014] The detachable supporting legs are of telescopic structure.

[0015] The advantages of the utility model are:

[0016] (1) By setting up a tooling stand, a gas groove longitudinally opened on the top surface of the tooling stand, and a back gas protection slider installed in conjunction with the gas groove, the air can be quickly replaced by introducing protective gas into the gas groove before welding, and the air flow has a good heat dissipation effect, thereby not only saving protective gas and increasing the gas replacement efficiency, but also the gas purity after replacement is high, effectively solving the problem of the air on the back of the weld not being completely exhausted and the back protective gas being impure during the welding of special material test plates, which causes the test plates to absorb oxygen, hydrogen, and nitrogen; it also solves the problem of high back protective gas consumption during the welding of special material test plates.

[0017] (2) Through the two cooling channels set in the tooling stand, which are located on one side of the air trough, water or nitrogen can be introduced for circulating cooling according to actual conditions to take away the welding heat in time, effectively preventing the weld and heat-affected zone from oxidizing due to staying at high temperature for too long, and also reducing the cooling time, improving the welding efficiency, and effectively solving the problem of long waiting time for welding special material test plates due to the small size of the test plates.

[0018] (3) The steady flow holes arranged on the back air protection slider make the protective airflow more stable and evenly protect the entire test plate, with good effect.

[0019] (4) The test plate fixing device set on the edge of the tooling stand can firmly fix the test plate on the tooling stand, ensuring that the test plate and the tooling fit tightly, reducing the deformation of the test plate caused by welding stress during welding of special material test plates, as well as the leakage of back shielding gas and poor cooling effect caused by deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of the special material test plate welding protection device of the utility model;

[0021] Figure 2 This is a side structural diagram of the special material test plate welding protection device of the utility model;

[0022] Figure 3 This is a schematic diagram of the top view of the special material test plate welding protection device of the present invention. DETAILED DESCRIPTION

[0023] The special material test plate welding protection device of the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] As shown in the figure, the special material test plate welding protection device of the present invention includes a tooling stand 1 as a carrier for the test plate 9, an air groove 2 longitudinally opened on the top surface of the tooling stand 1, a back air protection slider 3 pressed on the top of the air groove, and a support leg 4 set at the bottom of the tooling stand 1. It can be seen from the figure that the air groove 2 is arranged along the symmetrical center of the width direction of the tooling stand 1, that is, the air groove 2 is arranged on the center line of the width direction of the tooling stand 1. As for the specific structure of the air groove 2, it is mainly composed of a hollow groove 11 with a trapezoidal cross-section structure and a placement groove 12 with a rectangular cross-section structure connected to the upper section of the hollow groove. The back air protection slider 3 is placed in the placement groove 12. Two cooling channels 10 are provided in the tooling stand 1, which are respectively located on the front and rear sides of the air groove 2. Figure 3 It can be seen that the two cooling channels 10 are arranged in parallel on the front and rear sides of the air slot 2 ( Figure 3 The upper side shown is defined as the rear side, Figure 3 The lower side is defined as the front side), the left and right sides of the tooling stand 1 ( Figure 3 2 and 3. The cooling channel 9 is provided with a plurality of through holes (in the direction shown) for introducing the cooling medium into the cooling channel. During processing, through holes are drilled on the tooling stand that run through the left and right sides of the entire tooling stand as cooling channels, and the cooling channel inlet and outlet 6 are connected. The bottom surface of the tooling stand 1 is connected with a back shielding gas inlet 7 for introducing shielding gas into the gas groove 2. During welding, shielding gas is introduced into the gas groove 2 from the back shielding gas inlet 5 in advance. A test plate fixing device 10 for fixing the test plate 9 is provided at the edge of the tooling stand 1. Flow stabilizing holes 8 are arranged on the back gas protection slider 3. The main function of the flow stabilizing holes 8 is to stabilize the flow, make the shielding gas flow more stable, and evenly protect the entire test plate. The test plate 9 is placed on the back gas protection slider 3 of the tooling stand 1 and is pressed and fixed on the tooling stand 1 by the test plate fixing device 10.

[0025] Furthermore, the tooling stand 1 is made of aluminum alloy material, which has good thermal conductivity and can quickly transfer welding heat to prevent the test plate from heating up too quickly; the back gas protection block 3 is a copper block, and the cooling medium is water or nitrogen.

[0026] Furthermore, the test plate fixing device 5 can use a ready-made fixture to facilitate installation and removal. Figure 2It can be seen that the test plate fixing device of this embodiment includes a C-frame 13, a pressure arm 14 is provided on the top arm of the C-frame, and a clamping nut 15 screwed on the pressure arm. The test plate fixing device can be used to firmly fix the test plate on the tooling stand to ensure that the test plate and the tooling fit tightly, reduce the welding deformation of the test plate and the problems such as leakage of back shielding gas and poor cooling effect caused by deformation; the support leg 4 is a detachable support leg made of stainless steel pipe (existing conventional structure), which is easy to disassemble. The detachable support leg is designed as a telescopic structure, that is, a multi-section structure of sleeve connection. During the process evaluation, the height can be adjusted according to the height and welding posture of the welder to reduce labor intensity.

[0027] Here’s how it works:

[0028] Place the back gas protection slider into the gas groove → fix the welding test plate on the tooling stand with the test plate fixing device → stick high-temperature tape 16 around the test plate to further improve the sealing effect → supply gas protection to the back in advance during welding → weld the test plate → drag the cover + welding gun protection on the front → welding is completed and the test plate is removed; that is: after the test plate and the tooling are assembled and fixed, supply gas protection to the back in advance, wait for a while, and start welding the test plate after the air in the internal cavity is completely replaced. After the welding is completed and the welding part cools to the specified temperature, weld the next layer of welding joints. It has diverse adaptability and can be used for special material test plates regardless of thickness, size, and length; the gas replacement is fast and the replacement effect is good. The back gas can be quickly replaced, which greatly improves work efficiency. In addition, the protective gas is continuously filled into the air cavity during welding, and the cooling effect is good. It can greatly save protective gas. Since the cavity gas channel is used, the channel cross-sectional area is small and the sealing effect is good. Only a small amount of gas flow is required to achieve the replacement effect. Moreover, the replacement time is short and the gas consumption is correspondingly reduced; it does not pollute the test plate. Since it is made of aluminum alloy, it has fast heat conduction and an additional cooling device, which greatly shortens the welding waiting time; the preparation cycle is short and the operation is simple and quick, which can greatly improve work efficiency; in addition, the split structure design can add other functions according to actual needs, and it is easy to disassemble and install, sturdy and durable. It is suitable for welding various special material test plates, effectively protecting the weld and the base materials on both sides from air oxidation, saving argon gas consumption, and saving preparation time.

[0029] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A special material test plate welding protection device, characterized by: The invention comprises a tooling stand (1) used as a carrier for a test plate (9), an air groove (2) longitudinally opened on the top surface of the tooling stand (1), a back air protection slider (3) pressed on the top of the air groove, and a support leg (4) arranged at the bottom of the tooling stand (1), wherein two cooling channels (5) are arranged in the tooling stand (1), each located on one side of the air groove (2), and cooling channel inlets (6) for introducing cooling medium into the cooling channels are arranged on the left and right sides of the tooling stand (1). A back air protection inlet (7) for introducing protective gas into the air groove (2) is connected to the bottom surface of the tooling stand (1), and a steady flow hole (8) is arranged on the back air protection slider (3). The test plate (9) is placed on the back air protection slider (3) of the tooling stand (1).

2. The special material test plate welding protection device according to claim 1, characterized in that: A test plate fixing device (10) for fixing the test plate (9) is provided at the edge of the tooling stand (1), and the test plate (9) is pressed and fixed on the tooling stand (1) by the test plate fixing device (10).

3. The special material test plate welding protection device according to claim 1 or 2, characterized in that: The gas groove (2) is composed of a hollow groove (11) with a trapezoidal cross-section structure and a placement groove (12) with a rectangular cross-section structure connected to the upper section of the hollow groove, and the back gas protection slider (3) is placed in the placement groove (12).

4. The special material test plate welding protection device according to claim 3, characterized in that: The two cooling channels (5) are arranged in parallel on both sides of the air groove (2).

5. The special material test plate welding protection device according to claim 1, 2 or 4, characterized in that: The tooling stand (1) is made of aluminum alloy material.

6. The special material test plate welding protection device according to claim 5, characterized in that: The back gas protection slider (3) is a copper block.

7. The special material test plate welding protection device according to claim 1, 2, 4 or 6, characterized in that: The cooling medium is water or nitrogen.

8. The special material test plate welding protection device according to claim 2, characterized in that: The test plate fixing device (10) comprises a C-shaped frame (13), a pressure arm (14) provided on the top arm of the C-shaped frame, and a compression nut (15) screwed onto the pressure arm.

9. The special material test plate welding protection device according to claim 8, characterized in that: The supporting legs (4) are detachable supporting legs.

10. The special material test plate welding protection device according to claim 9, characterized in that: The detachable supporting legs are of telescopic structure.

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