A process for implementing a fine wire argon arc welding

Abstract

The application provides a process method for realizing filament argon arc welding, and belongs to the technical field of welding. Specifically, a platinum wire is wound on a nickel wire, and one end of the platinum wire is bound and fixed on one end of the nickel wire; a welding clamp is processed, the welding clamp comprises a metal block, and a through hole is arranged on the metal block; the platinum wire and the nickel wire are inserted into the through hole, the binding end of the platinum wire and the nickel wire is close to one end of the through hole, and the binding end of the platinum wire and the nickel wire is spaced from the inner wall of the through hole; a welding gun is connected to the positive electrode of a welding machine, and the metal block is connected to the negative electrode of the welding machine; the welding gun is ignited from one side of the metal block, moves to the binding end of the platinum wire and the nickel wire at the through hole, and leaves the nickel wire after melting the nickel wire by using an arc edge, so that the welding is completed. Through the processing scheme, the success rate of argon arc welding of 0.02mm platinum wire and 0.4mm nickel wire is improved.

Description

Technical Field

[0001] This application relates to the field of welding, and in particular to a process method for achieving fine wire argon arc welding. Background Technology

[0002] The temperature sensing end of a platinum resistance thermometer requires the connection of a 0.02mm platinum wire and a 0.4mm nickel wire. Currently, brazing is the primary method used for this connection. However, brazing introduces a third material, which affects the product's accuracy and response time. Argon arc welding (argon arc welding) could effectively avoid this problem. However, argon arc welding of 0.02mm platinum wire and 0.4mm nickel wire presents the following challenges: 1. The wires are too thin, making it difficult to control the gap between the parts; 2. Platinum wire has low hardness, making it easily damaged and unsuitable for direct rigid contact with other metals, thus preventing heat dissipation through bonding with other metals; 3. The welding process requires a low-heat, stable arc. Currently, the argon arc welding method for 0.02mm platinum wire and 0.4mm nickel wire has not yet been commercialized. Summary of the Invention

[0003] In view of this, this application provides a process method for realizing fine wire argon arc welding, which solves the problems in the prior art and improves the success rate of argon arc welding of 0.02mm platinum wire and 0.4mm nickel wire.

[0004] The technical solution provided in this application for a process method to achieve fine wire argon arc welding is as follows:

[0005] A process for achieving fine wire argon arc welding includes the following steps:

[0006] The platinum wire is wound around the nickel wire, and one end of the platinum wire is tied and fixed to one end of the nickel wire;

[0007] A welding fixture is fabricated, the welding fixture comprising a metal block having through holes;

[0008] The platinum wire and nickel wire are inserted into the through hole, and the binding ends of the platinum wire and nickel wire are close to one end of the through hole, with the binding ends of the platinum wire and nickel wire spaced apart from the inner wall of the through hole.

[0009] Connect the welding torch to the positive terminal of the welding machine, and connect the metal block to the negative terminal of the welding machine;

[0010] The welding torch starts its arc from one side of the metal block, moves to the binding end of the platinum and nickel wires at the through hole, melts the nickel wire using the edge of the arc, and then leaves the nickel wire to complete the welding.

[0011] Optionally, the conductivity of the metal block is 30-50 ms / m, and the melting point of the metal block is 850-950 degrees Celsius.

[0012] Optionally, the metal block is made of copper.

[0013] Optionally, the through hole includes a first section, a transition section, and a second section. The inner diameter of the first section is larger than the inner diameter of the second section. The transition section is tapered. The first section and the second section are connected through the transition section. The second section corresponds to the binding ends of the platinum wire and the nickel wire. The platinum wire and the nickel wire are inserted into the through hole from one side of the second section.

[0014] Optionally, the ratio of the inner diameter of the second segment to the radius of the nickel wire is 5:1.

[0015] Optionally, the welding current is 20±3A from the moment the welding torch starts to the moment the welding is completed.

[0016] Optionally, during welding, the closest distance between the welding torch and the platinum or nickel wire is 3-6 mm.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] During welding, the welding torch and the metal block form a circuit. The electric arc only appears on the surface of the metal block and does not melt the fine wire inside the through-hole. Simultaneously, most of the heat from the arc is absorbed by the fixture, with only a small amount melting the nickel and platinum wires exposed outside the fixture. Therefore, no other metal bonding is needed for heat dissipation. In TIG welding, the welding torch initiates the arc from the copper fixture, moves to the welding area, melts the nickel wire using the edge of the arc, and then quickly leaves the wire to complete the welding. TIG welding requires high-frequency oscillation to initiate the arc, resulting in an unstable arc. The welding process maintains a relatively stable current. This method ensures arc stability when welding fine wires. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the welding torch, platinum wire, nickel wire, welding fixture, and welding machine used in this application.

[0021] Figure 2 This is a schematic diagram of the trajectory of the welding torch during the welding process of this application.

[0022] Explanation of reference numerals in the attached diagram: 1. Platinum wire; 2. Nickel wire; 3. Metal block; 31. Through hole; 4. Welding torch; 5. Welding machine. Detailed Implementation

[0023] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0024] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0026] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0028] This application provides a process method for achieving fine-wire argon arc welding. This method is applicable to the welding of 0.02mm platinum wire and 0.4mm nickel wire.

[0029] like Figure 1 and Figure 2 As shown, a process for achieving fine wire argon arc welding includes the following steps:

[0030] The platinum wire 1 is wound around the nickel wire 2, and one end of the platinum wire 1 is tied and fixed to one end of the nickel wire 2.

[0031] A welding fixture is processed, the welding fixture includes a metal block 3, and the metal block 3 is provided with a through hole 31.

[0032] The platinum wire 1 and nickel wire 2 are inserted into the through hole 31, with the binding ends of the platinum wire 1 and nickel wire 2 close to one end of the through hole 31, and the binding ends of the platinum wire 1 and nickel wire 2 spaced apart from the inner wall of the through hole 31. In one embodiment, the end of the nickel wire 2 away from the binding end is located outside the through hole 31, and the nickel wire 2 is fixed to the insulating base, thereby fixing the nickel wire 2 and the platinum wire 1.

[0033] Connect the welding torch 4 to the positive terminal of the welding machine 5, and connect the metal block 3 to the negative terminal of the welding machine 5. The welding machine 5 is an argon arc welding machine.

[0034] The welding torch 4 initiates an arc from one side of the metal block 3, moves to the binding end of the platinum wire 1 and nickel wire 2 at the through hole 31, melts the nickel wire 2 using the edge of the arc, and then leaves the nickel wire 2 to complete the welding. The welding current is 20±3A. During welding, the closest distance between the welding torch 4 and the platinum wire 1 or nickel wire 2 is 3-6mm.

[0035] During welding, the welding torch 4 and the metal block 3 form a circuit. The electric arc only appears on the surface of the metal block 3 and will not melt the fine wire inside the through hole 31. At the same time, most of the heat from the arc is absorbed by the fixture, and only a small amount of heat melts the nickel wire 2 and platinum wire 1 exposed outside the fixture. Therefore, it is not necessary to use other metals for heat dissipation. The argon arc welding torch 4 starts the arc from the copper fixture, moves to the welding area, melts the nickel wire 2 using the edge of the arc, and quickly leaves the nickel wire 2 to complete the welding. When the argon arc welding arc is started, high-frequency oscillation is required, and the arc is unstable. The current is relatively stable during the welding process. This method ensures the stability of the arc when welding fine wires.

[0036] The method described in this application successfully achieves the connection of 0.02 platinum wire and 0.4 nickel wire by argon arc welding, with a first-pass yield rate of over 90%, and can be applied to the product manufacturing process.

[0037] Specifically, the metal block has a conductivity of 30-50 ms / m and a melting point of 850-950 degrees Celsius. The metal block is made of copper.

[0038] The through hole 31 includes a first section, a transition section, and a second section. The inner diameter of the first section is larger than that of the second section. The transition section is tapered. The first section and the second section are connected through the transition section. The second section corresponds to the binding ends of the platinum wire 1 and the nickel wire 2. The platinum wire 1 and the nickel wire 2 are inserted into the through hole 31 from one side of the second section.

[0039] The ratio of the inner diameter of the second section to the radius of the nickel wire is 5:1.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A process for achieving fine wire argon arc welding, characterized in that, Includes the following steps: The platinum wire is wound around the nickel wire, and one end of the platinum wire is tied and fixed to one end of the nickel wire; A welding fixture is fabricated, the welding fixture comprising a metal block having through holes; The platinum wire and nickel wire are inserted into the through hole, and the binding ends of the platinum wire and nickel wire are close to one end of the through hole, with the binding ends of the platinum wire and nickel wire spaced apart from the inner wall of the through hole. Connect the welding torch to the positive terminal of the welding machine, and connect the metal block to the negative terminal of the welding machine; The welding torch starts its arc from one side of the metal block, moves to the binding end of the platinum and nickel wires at the through hole, melts the nickel wire using the edge of the arc, and then leaves the nickel wire to complete the welding.

2. The process method for achieving fine wire argon arc welding according to claim 1, characterized in that, The conductivity of the metal block is 30-50 ms / m, and the melting point of the metal block is 850-950 degrees Celsius.

3. The process method for achieving fine wire argon arc welding according to claim 1, characterized in that, The metal block is made of copper.

4. The process method for achieving fine wire argon arc welding according to claim 1, characterized in that, The through hole includes a first section, a transition section, and a second section. The inner diameter of the first section is larger than that of the second section. The transition section is tapered. The first section and the second section are connected through the transition section. The second section corresponds to the binding ends of the platinum wire and the nickel wire. The platinum wire and the nickel wire are inserted into the through hole from one side of the second section.

5. The process method for achieving fine wire argon arc welding according to claim 4, characterized in that, The ratio of the inner diameter of the second section to the radius of the nickel wire is 5:

1.

6. The process method for achieving fine wire argon arc welding according to claim 1, characterized in that, The welding current is 20±3A from the moment the welding torch starts to arc from one side of the metal block until the welding is completed.

7. The process method for achieving fine wire argon arc welding according to claim 1, characterized in that, During welding, the closest distance between the welding torch and the platinum or nickel wire is 3-6 mm.

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