Temperature control protection tool for thin-wall welding and welding process

Abstract

The invention is applicable to the technical field of welding, and provides a temperature control protection tool for thin-wall welding, comprising: a workpiece to be welded, the workpiece to be welded comprising a first workpiece and a second workpiece, and a weld zone between the first workpiece and the second workpiece; the inner ring cooling workpiece is provided with a cooling flow channel, is attached to the welding seam area and is used for taking away heat near the welding seam; the outer ring cooling tool is provided with a cooling flow channel, and the outer ring cooling tool is attached to the first workpiece and used for reducing the temperature of the first workpiece and protecting a non-welding area; the back gas protection tool is installed between the first workpiece and the second workpiece, located on the back of the weld joint and used for replacing gas in the back area of the weld joint with inert gas. The invention further provides a welding process for thin-wall welding, and the temperature control protection tool is adopted in the welding process. While the welding quality is ensured, brazed welding seams, plating layers, non-metal parts and the like near fusion welding seams are protected from being damaged due to too high temperature.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a temperature control protection tooling and a welding process for thin-wall welding. Background Art

[0002] Welding is a manufacturing process and technology that joins metals or other thermoplastic materials by heating, high temperature or high pressure, and is widely used in the industrial field.

[0003] With the development of welding technology, fusion welding technologies such as argon arc welding and laser welding have become more and more perfect. However, in terms of the principle of fusion welding, the welding temperature of fusion welding is higher than the melting point of the material, and the coating, brazing welds and other connectors near the fusion welding seam can withstand a temperature far lower than the melting point of the material. Therefore, temperature-controlled tooling is required for protection. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a temperature control protection tool for thin-wall welding, aiming to solve the problems existing in the above-mentioned background technology.

[0005] The embodiment of the present invention is implemented as follows: a temperature control protection tool for thin-wall welding, comprising: Workpieces to be welded, the workpieces to be welded comprising a first workpiece and a second workpiece, and a weld area is provided between the first workpiece and the second workpiece; The inner ring cooling workpiece is provided with a cooling channel, which fits the weld area and is used to take away the heat near the weld; An outer ring cooling fixture, wherein the outer ring cooling fixture is provided with a cooling channel and is fitted to the first workpiece to reduce the temperature of the first workpiece and protect a non-welding area; The back gas protection tooling is installed between the first workpiece and the second workpiece, located at the back of the weld, and is used to replace the gas in the back area of ​​the weld with an inert gas.

[0006] Preferably, a notch is provided on the inner ring cooling workpiece, and the notch is aligned with the weld.

[0007] Preferably, it also includes a cooling device connected to the water inlet pipe of the inner ring cooling workpiece for circulating cooling.

[0008] Preferably, a cooling device is also included, which is connected to the water inlet pipe of the outer ring cooling tooling for circulating cooling.

[0009] Preferably, an inert gas source is also included, which is connected to the gas inlet of the back gas protection tooling for gas replacement.

[0010] Preferably, the inert gas is argon.

[0011] Another object of the embodiment of the present invention is to provide a welding process for thin-wall welding, using the above-mentioned temperature control protection tooling, specifically comprising the following steps: S1, assembling and positioning the first workpiece and the second workpiece to ensure that the weld can be welded; S2, installing the inner ring cooling workpiece, the notch of the inner ring cooling workpiece is aligned with the weld and fits tightly with the second workpiece; S3, installing the outer ring cooling fixture, so that the outer ring cooling fixture is closely fitted to the first workpiece; S4. Install the back gas protection tooling on the back area of ​​the weld to form a closed cavity in the back area of ​​the weld; S5. Connect the back gas protection tooling to the inert gas source, and turn on the gas source to replace the gas in the back area of ​​the weld; S6. Connect the water inlet pipe of the inner ring cooling workpiece to the cooling equipment, and open the valve for circulating cooling; S7. Connect the water inlet pipe of the outer ring cooling fixture to the cooling equipment, and open the valve for circulating cooling; S8. According to the welding process, welding is performed on the weld area exposed by the notch of the inner ring cooling workpiece; S9, after the previous welding is completed, drive the inner ring cooling workpiece to rotate 180 degrees to weld the welds in the symmetrical area; S10. After each weld is completed, the inner ring is rotated to cool the workpiece until all welds in one circle are completed.

[0012] A temperature control protection tool for thin-wall welding provided in an embodiment of the present invention can be used for welding thin-walled metal pipes, reduce the welding heat affected zone of metal parts fusion welding, and protect the heat affected zone of the weld. The welding method is a fusion welding method such as argon arc welding or laser welding, which reduces the temperature of the area around the fusion welding seam during welding. While ensuring the welding quality, the brazing seam, coating, non-metallic parts, etc. near the fusion welding seam are protected from damage due to excessive temperature. The tooling has a compact structure, small size, and strong applicability. It can be used in various complex shapes and narrow spaces. It not only reduces the difficulty of processing and assembly, but also makes it easier to ensure the quality of the weld and increase the reliability of the entire product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 2 An exploded view of a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an outer ring cooling tooling in a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 4 A schematic structural diagram of an inner ring cooling tooling in a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 5 A schematic structural diagram of a back-gas protection tooling in a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of a first workpiece in a temperature control and protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of a second workpiece in a temperature control and protection tooling for thin-wall welding provided by an embodiment of the present invention; Figure 8 A schematic diagram of the weld positions of a first workpiece and a second workpiece in a temperature control and protection tooling for thin-wall welding provided in an embodiment of the present invention.

[0014] In the attached drawings: 1-outer ring cooling tooling; 2-workpiece to be welded; 21-first workpiece; 22-second workpiece; 3-inner ring cooling tooling; 4-back gas protection tooling. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0017] like Figure 1 to Figure 2 , Figure 6 to Figure 7 As shown, a structural diagram of a temperature control protection tooling for thin-wall welding provided by an embodiment of the present invention includes: A workpiece 2 to be welded, the workpiece 2 to be welded comprising a first workpiece 21 and a second workpiece 22, wherein a weld area is formed between the first workpiece 21 and the second workpiece 22; The inner ring cooling workpiece 3 is provided with a cooling channel, which fits the weld area and is used to take away the heat near the weld; An outer ring cooling fixture 1, wherein the outer ring cooling fixture 1 is provided with a cooling channel and is fitted to the first workpiece 21, so as to reduce the temperature of the first workpiece 21 and protect the non-welding area; The back gas protection tool 4 is installed between the first workpiece 21 and the second workpiece 22, located at the back of the weld, and is used to replace the gas in the back area of ​​the weld with an inert gas.

[0018] In one embodiment of the present invention, the temperature control protection tooling for thin-wall welding is provided with an outer ring cooling tooling 1, an inner ring cooling workpiece 3 and a back gas protection tooling 4 to address the problems raised in the above background technology. The outer ring cooling tooling 1, the inner ring cooling workpiece 3 and the back gas protection tooling 4 can quickly take away the heat near the weld, reduce the total amount of heat transfer, protect the non-welding area, and effectively isolate the air from oxidizing the back area of ​​the weld. The specific process is as follows: The first workpiece 21 and the second workpiece 22 constitute a workpiece 2 to be welded, wherein the first workpiece 21 can be a brazing part, and there is a brazing weld on the first workpiece 21. The second workpiece 22 is a stainless steel part. The welding material is mostly Kovar alloy and stainless steel, and can also be extended to the docking of other metal materials. The weld between the first workpiece 21 and the second workpiece 22 is a thin-walled ring weld, and the weld position is very close to the brazing position. Argon arc welding or laser welding is used. During the welding process, the brazing weld is easily damaged due to excessive heat input. Therefore, before welding, the inner ring cooling workpiece 3 is first installed at the weld position of the workpiece 2 to be welded, and is close to both sides of the weld, so that the heat near the weld is quickly taken away to reduce the total amount of heat transfer. Then, the outer ring cooling tooling 1 is assembled between the weld and the brazing weld, and is tightly fitted with the first workpiece 21, which can effectively reduce the overall temperature of the first workpiece 21, thereby protecting the non-welding area (brazing weld) of the first workpiece 21. Then, the back gas protection tooling 4 is not only on the back side of the weld, but also the gas in the back area of ​​the weld can be replaced with an inert gas.

[0019] like Figure 4 As shown, as a preferred embodiment of the present invention, a notch is provided on the inner ring cooling workpiece 3, and the notch is aligned with the weld; Specifically, it also includes a cooling device connected to the water inlet pipe of the inner ring cooling workpiece 3 for circulating cooling.

[0020] A notch is provided on the inner ring cooling workpiece 3 to center the weld for easy welding. The cross section of the inner ring cooling workpiece 3 is inner circle and outer square, and is provided with a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to the cooling device. The cooling device can be a water pump to form a cooling water path, increase the heat conduction power, and reduce the heat affected zone of the weld during welding. During welding, the weld at the notch position is welded. After welding is completed, the inner ring cooling workpiece 3 is rotated to weld the next section of the weld until all the welds in one circle are welded; The inner ring cooling workpiece 3 is mostly made of a material with good thermal conductivity, such as copper.

[0021] like Figure 3 As shown, as a preferred embodiment of the present invention, it also includes a cooling device connected to the water inlet pipe of the outer ring cooling tooling 1 for circulating cooling.

[0022] The outer ring cooling fixture 1 is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is connected to a cooling device, the cooling device can be a water pump, and a cooling water path can be formed to increase the heat conduction power, thereby reducing the heat received by the brazing seam, thereby protecting the brazing seam; The outer ring cooling fixture 1 is mostly made of a material with good thermal conductivity, such as copper.

[0023] like Figure 5 As shown, as a preferred embodiment of the present invention, it also includes an inert gas source connected to the gas inlet of the back gas protection tooling 4 for gas replacement; Specifically, the inert gas is argon.

[0024] The inert gas is replaced by the back gas protection tool 4, which is beneficial to the back forming of the weld, reduces the risk of defects, and also reduces the oxidized area of ​​the weld; 4 According to actual needs, it can meet the assembly requirements and micro-air pressure sealing requirements, such as aluminum, stainless steel, engineering plastics, etc., and pay attention to avoid material contamination of the workpiece.

[0025] Another embodiment of the present invention provides a welding process for thin-wall welding, using the above-mentioned temperature control protection tooling, specifically comprising the following steps: S1, assembling and positioning the first workpiece 21 and the second workpiece 22 to ensure that the weld can be welded; S2, installing the inner ring cooling workpiece 3, the notch of the inner ring cooling workpiece 3 is aligned with the weld and is tightly fitted to the second workpiece 22; S3, installing the outer ring cooling fixture 1, which is disposed between the brazing seam and the welding seam and is closely fitted to the first workpiece 21; S4, installing a back gas protection tool 4 on the back area of ​​the weld, so that the back area of ​​the weld forms a closed cavity; S5, connecting the back gas protection tooling 4 to the inert gas source, and opening the gas source to replace the gas in the back area of ​​the weld; S6, connecting the water inlet pipe of the inner ring cooling workpiece 3 to the cooling equipment, and opening the valve for circulating cooling; S7, connect the water inlet pipe of the outer ring cooling fixture 1 to the cooling equipment, and open the valve for circulating cooling; S8. According to the welding process, welding is performed on the weld area exposed by the notch of the inner ring cooling workpiece 3; S9, after the previous welding is completed, the inner ring cooling workpiece 3 is driven to rotate 180 degrees to weld the welds in the symmetrical area; S10, after each welding of a section of the weld, the inner ring is rotated to cool the workpiece 3 until all the welds of one circle are welded.

[0026] During welding, first use the back gas protection tooling 4 to replace the gas in the back area of ​​the weld with an inert gas, such as argon, and then connect the air intake pipes of the inner ring cooling tooling 3 and the outer ring cooling tooling 1 to the water pump to form an inner ring water cooling pipeline, and then weld the weld at the notch position of the inner ring cooling tooling 3. After welding is completed, rotate the inner ring cooling tooling 3 to weld the next section of the weld until all the welds in one circle are welded.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature control protection tool for thin-wall welding, characterized in that: include: A workpiece to be welded (2), the workpiece to be welded (2) comprising a first workpiece (21) and a second workpiece (22), a weld region being provided between the first workpiece (21) and the second workpiece (22); An inner ring cooling workpiece (3), wherein the inner ring cooling workpiece (3) is provided with a cooling channel, which fits the weld area and is used to remove heat near the weld; An outer ring cooling fixture (1), the outer ring cooling fixture (1) being provided with a cooling channel and being fitted to the first workpiece (21) to reduce the temperature of the first workpiece (21) and protect a non-welding area; The back gas protection tool (4) is installed between the first workpiece (21) and the second workpiece (22), located at the back of the weld, and is used to replace the gas in the back area of ​​the weld with an inert gas.

2. The temperature control protection tooling for thin-wall welding according to claim 1 is characterized in that: The inner ring cooling workpiece (3) is provided with a notch, and the notch is aligned with the weld.

3. The temperature control protection tooling for thin-wall welding according to claim 1 is characterized in that: It also includes cooling equipment connected to the water inlet pipe of the inner ring cooling workpiece (3) for circulating cooling.

4. The temperature control protection tooling for thin-wall welding according to claim 1 is characterized in that: It also includes cooling equipment connected to the water inlet pipe of the outer ring cooling tooling (1) for performing circulating cooling.

5. The temperature control and protection tooling for thin-wall welding according to claim 1 is characterized in that: It also includes an inert gas source connected to the gas inlet of the back gas protection tooling (4) for gas replacement.

6. The temperature control and protection tooling for thin-wall welding according to claim 5 is characterized in that: The inert gas is argon.

7. A welding process for thin-wall welding, characterized in that: The temperature control protection tooling as described in any one of claims 1 to 6 is used, and specifically comprises the following steps: S1, assembling and positioning the first workpiece (21) and the second workpiece (22) to ensure that the weld can be welded; S2, installing the inner ring cooling workpiece (3), with the notch of the inner ring cooling workpiece (3) aligning with the weld and fitting tightly with the second workpiece (22); S3, installing the outer ring cooling fixture (1), wherein the outer ring cooling fixture (1) is tightly fitted to the first workpiece (21); S4, installing a back gas protection tool (4) on the back area of ​​the weld, so that the back area of ​​the weld forms a closed cavity; S5, connecting the back gas protection tooling (4) to an inert gas source, and opening the gas source to replace the gas in the back area of ​​the weld; S6, connecting the water inlet pipe of the inner ring cooling workpiece (3) to the cooling equipment, and opening the valve for circulating cooling; S7, connecting the water inlet pipe of the outer ring cooling fixture (1) to the cooling equipment, and opening the valve for circulating cooling; S8, welding the weld area exposed by the notch of the inner ring cooling workpiece (3) according to the welding process; S9, after the previous welding is completed, the inner ring cooling workpiece (3) is driven to rotate 180 degrees to weld the welds in the symmetrical area; S10, after each weld is completed, the inner ring is rotated to cool the workpiece (3) until all welds of one circle are completed.

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