Tungsten electrode seat capable of adjusting position of tungsten electrode and tube-tube plate welding gun

Abstract

The utility model provides a tungsten electrode seat capable of adjusting the position of a tungsten electrode and a tube-tube plate welding gun. The tungsten electrode seat capable of adjusting the position of the tungsten electrode comprises a tungsten electrode base; the first end of the welding torch is rotationally connected with the tungsten electrode base; the tungsten electrode is fixed at the second end of the welding torch; the adjusting piece abuts against the second end of the welding torch and is used for adjusting the rotating angle of the welding torch; and the fixing piece is connected with the welding torch and is used for fixing the welding torch on the tungsten electrode base. According to the tungsten electrode holder, the position of the tungsten electrode can be adjusted according to the pipe diameters of different pipes, and the tungsten electrode holder is suitable for welding of pipe plate joints of all steam generator pipes in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of welding torch technology, and in particular to a tungsten electrode holder with adjustable tungsten electrode position and a tube-to-tube sheet welding torch. Background Technology

[0002] Nuclear-powered electric water reactor steam generators have numerous tube-to-tube sheet welded joints. Taking the Hualong Nuclear Power Project as an example, a single steam generator has over 12,000 tube-to-tube sheet joints. The dimensions of the evaporator tubes also vary between different projects, with most evaporator tubes having an outer diameter of 14–20 mm and a wall thickness of 1–2 mm. Currently, all tube-to-tube sheet joints are welded using automated tungsten inert gas (TIG) welding. Each welding torch contains a tungsten electrode holder, such as... Figure 1 As shown, the traditional tungsten electrode holder 10 is made of metallic copper. Holes are drilled at appropriate positions from the center of the mandrel to mount the tungsten electrode 20, depending on the size of the tube. Figure 1 The four holes 11 shown are the tungsten electrode positions corresponding to tubes of different sizes. This tungsten electrode holder 10 can only weld tube-to-tube sheet joints of these four different diameters. If there are tube-to-tube sheet joints of other sizes, the tungsten electrode holder needs to be remade. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable tungsten electrode holder and a tube-to-tube sheet welding torch. The tungsten electrode holder can adjust the position of the tungsten electrode according to different tube diameters and is suitable for welding tube-to-tube sheet joints of all currently manufactured steam generators.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] An adjustable tungsten electrode holder, comprising:

[0006] Tungsten electrode base;

[0007] The welding torch, the first end of which is rotatably connected to the tungsten electrode base;

[0008] A tungsten electrode, which is fixed to the second end of the welding torch;

[0009] An adjusting element, which abuts against the second end of the welding torch, is used to adjust the angle of rotation of the welding torch;

[0010] A fastener, which is connected to the welding torch, is used to fix the welding torch on the tungsten electrode base.

[0011] Optionally, a positioning pin is fixed on the tungsten electrode base, and the first end of the welding torch is rotatably connected to the positioning pin, and the welding torch rotates about the positioning pin as an axis.

[0012] Optionally, the tungsten electrode base is provided with a receiving groove, and the welding torch is disposed in the receiving groove.

[0013] Optionally, the adjusting member is a bolt, and the side wall of the receiving groove is provided with a first bolt hole that penetrates the outer side wall of the tungsten electrode base, and the adjusting member is disposed in the first bolt hole.

[0014] Optionally, the fixing member is a bolt, the tungsten electrode base is provided with a second bolt hole, the welding torch is provided with an arc-shaped hole, the center of the arc-shaped hole is located at the position where the welding torch and the tungsten electrode base are connected, and the fixing member passes through the arc-shaped hole and is set in the second bolt hole.

[0015] Optionally, the diameter of the tungsten electrode is 1.6 mm or 2.0 mm.

[0016] Optionally, the tungsten electrode base is provided with mounting holes for mounting a positioning mandrel.

[0017] Optionally, the tungsten electrode base is also provided with a protective gas channel.

[0018] A tube-to-tube sheet welding torch includes a tungsten electrode holder with an adjustable tungsten electrode position as described in any of the above claims.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This invention provides a tungsten electrode holder for adjusting the position of tungsten electrodes at tube-to-tube sheet joints of evaporators of different sizes. The welding torch is adjusted using an adjusting component on the tungsten electrode holder according to the size of the tube-to-tube sheet being welded. The torch is rotated around its first end (i.e., the locating pin) to adjust the tungsten electrode to the designated position. Then, the welding torch is secured with a fixing component, thereby fixing the position of the tungsten electrode. The tungsten electrode holder of this invention allows for adjustment of the tungsten electrode position to tube-to-tube sheet joints with diameters ranging from 10mm to 25mm, currently covering almost all tube-to-tube sheet joints in pressurized water reactor steam generators. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings in the following description are one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the existing tungsten electrode holder.

[0023] Figure 2 An exploded view of an adjustable tungsten electrode holder according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of an adjustable tungsten electrode holder according to an embodiment of the present invention. Detailed Implementation

[0025] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the proposed solution of this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides an adjustable tungsten electrode holder, including: a tungsten electrode base 100; a welding torch 200, the first end of which is rotatably connected to the tungsten electrode base 100; a tungsten electrode 300, which is fixed to the second end of the welding torch 200; an adjusting member 400, which abuts against the second end of the welding torch 200, for adjusting the rotation angle of the welding torch 200; and a fixing member 500, which is connected to the welding torch 200, for fixing the welding torch 200 on the tungsten electrode base 100.

[0027] In this embodiment, the tungsten electrode base 100 is different from a conventional tungsten electrode base (such as...). Figure 1 The tungsten electrode base 100 serves the same purpose as shown in the diagram. It is used to fix the tungsten electrode to the welding torch. The center of the tungsten electrode base 100 is provided with a mounting hole 110 for mounting a positioning mandrel. During welding, the positioning mandrel is inserted into the tube hole to achieve axial positioning. Usually, the welding of the tube and tube sheet is carried out by argon arc welding. Therefore, the tungsten electrode base is also provided with a protective gas channel 120 for the flow of protective gas (such as argon).

[0028] In this embodiment, the tungsten electrode base 100 is provided with a pin hole 101 for mounting a positioning pin 600. The first end of the welding torch 200 is rotatably connected to the positioning pin 600, and the welding torch 200 rotates about the positioning pin 600 as an axis. In other embodiments, other methods can also be used to rotatably connect the welding torch 200 and the tungsten electrode base 100. For example, the first end of the welding torch 200 is provided with a protruding rotating shaft, and the tungsten electrode base 100 is provided with a suitable receiving hole. The rotating shaft is inserted into the receiving hole and can rotate within the receiving hole. This embodiment does not limit this.

[0029] like Figure 1 As shown, the tungsten electrode base 100 is provided with a receiving groove 130, and the welding torch 200 is disposed within the receiving groove 130 to make the entire tungsten electrode base structure compact. The function of the welding torch 200 is to install the tungsten electrode 300, and it is connected to the tungsten electrode base 100 through a positioning pin 600, so that it can rotate a certain angle on the tungsten electrode base 100 about the positioning pin 600 as an axis, and adjust the position of the tungsten electrode 300 according to the outer diameter of different tubes.

[0030] Furthermore, the adjusting component 400 is a bolt (hereinafter referred to as the adjusting bolt). The side wall of the receiving groove 130 is provided with a first bolt hole 131 that penetrates the outer side wall of the tungsten electrode base 100. The adjusting component 400 is disposed in the first bolt hole 131. Rotating the adjusting component 400 (i.e. the adjusting bolt) can adjust the rotation angle of the welding torch 200 within a certain range, so as to achieve the function of adjusting the position of the tungsten electrode 300.

[0031] In this embodiment, the fixing member 500 is a bolt (hereinafter referred to as the fixing bolt), the tungsten electrode base 100 is provided with a second bolt hole 102, and the welding torch 200 is provided with an arc-shaped hole 210. The arc center of the arc hole 210 is located at the connection position between the welding torch 200 and the tungsten electrode base 100 (i.e., the position of the positioning pin 600). The fixing member 500 passes through the arc hole 210 and is set in the second bolt hole 102. According to the size of the tube sheet to be welded, the welding torch 200 is adjusted by the adjusting member 400 (i.e., the adjusting bolt) so that the tungsten electrode 300 reaches the corresponding position, and then the fixing member 500 (i.e., the fixing bolt) is tightened to fix the position of the tungsten electrode 300 at this time.

[0032] The tungsten electrode holder of this embodiment is suitable for tube sheet welding in pressurized water reactor steam generators, therefore the diameter of the tungsten electrode 300 is 1.6 mm or 2.0 mm.

[0033] In this embodiment, the tungsten electrode holder adjusts the position of the tungsten electrode 300 according to the diameter of the pipe to be welded as follows: A positioning mandrel is installed in the mounting hole 110, the pipe to be welded is placed over the positioning mandrel, the adjusting member 400 (i.e., the adjusting bolt) is rotated while the welding torch 200 is rotated so that the tip of the tungsten electrode 300 is aligned with the outer diameter edge of the pipe to be welded, the pipe to be welded is removed, and the welding torch 200 is tightened by the fixing member 500 (i.e., the fixing bolt) to fix the tungsten electrode 300 in the adjusted position.

[0034] In this embodiment, the adjustment range of the tungsten electrode 300 position can be used for tube-to-tube sheet joints with a diameter of 10mm to 25mm.

[0035] Based on the same inventive concept, this utility model also provides a tube-to-tube sheet welding torch, which, in addition to the existing structure, includes a tungsten electrode holder with an adjustable tungsten electrode position as described above.

[0036] In summary, this utility model provides a tungsten electrode holder for adjusting the position of tungsten electrodes at tube sheet joints of different sizes in evaporators. The adjustment range is applicable to tube sheet joints with diameters from 10mm to 25mm, currently covering almost all tube sheet joints in pressurized water reactor steam generators. The welding torch is adjusted using the adjusting element (i.e., adjusting bolt) on the tungsten electrode holder according to the size of the tube sheet being welded. The torch rotates around its first end (i.e., the locating pin) to adjust the tungsten electrode to the designated position. Then, the welding torch is tightened using the fixing element (i.e., fixing bolt) to fix the position of the tungsten electrode.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A tungsten electrode holder with adjustable tungsten electrode position, characterized in that, include: Tungsten electrode base; The welding torch, the first end of which is rotatably connected to the tungsten electrode base; A tungsten electrode, which is fixed to the second end of the welding torch; An adjusting element, which abuts against the second end of the welding torch, is used to adjust the angle of rotation of the welding torch; A fixing element, which is connected to the welding torch, is used to fix the welding torch on the tungsten electrode base.

2. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, A positioning pin is fixed on the tungsten electrode base, and the first end of the welding torch is rotatably connected to the positioning pin. The welding torch rotates about the positioning pin as an axis.

3. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, The tungsten electrode base is provided with a receiving groove, and the welding torch is disposed in the receiving groove.

4. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 3, characterized in that, The adjusting component is a bolt, and the side wall of the receiving groove is provided with a first bolt hole that penetrates the outer side wall of the tungsten electrode base. The adjusting component is disposed in the first bolt hole.

5. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, The fixing component is a bolt, the tungsten electrode base is provided with a second bolt hole, the welding torch is provided with an arc-shaped hole, the center of the arc-shaped hole is located at the position where the welding torch and the tungsten electrode base are connected, and the fixing component passes through the arc-shaped hole and is set in the second bolt hole.

6. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, The diameter of the tungsten electrode is 1.6 mm or 2.0 mm.

7. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, The tungsten electrode base is provided with mounting holes for mounting the positioning mandrel.

8. The tungsten electrode holder with adjustable tungsten electrode position as described in claim 1, characterized in that, The tungsten electrode base is also equipped with a protective gas channel.

9. A tube-to-tube sheet welding torch, characterized in that, The tungsten electrode holder includes the adjustable tungsten electrode position as described in any one of claims 1 to 8.

Images