Process method for achieving filament argon arc welding

Abstract

The invention provides a technological method for achieving fine wire argon arc welding, and belongs to the technical field of welding. Specifically, a platinum wire is wound around a nickel wire, and one end of the platinum wire is bound and fixed to one end of the nickel wire; a welding clamp is machined and comprises a metal block, and a through hole is formed in the metal block; a platinum wire and a nickel wire penetrate into the through hole, the binding ends of the platinum wire and the nickel wire are made to be close to one end of the through hole, and the binding ends of the platinum wire and the nickel wire are spaced from the inner wall of the through hole; connecting the welding gun with the anode of a welding machine, and connecting the metal block with the cathode of the welding machine; and the welding gun arches from one side of the metal block, moves to the binding end of the platinum wire and the nickel wire at the through hole, melts the nickel wire through the edge of the arc and then leaves the nickel wire, and welding is completed. By means of the treatment scheme, the success rate of argon arc welding of the 0.02 mm platinum wire and the 0.4 mm nickel wire is increased.

Description

Technical Field

[0001] The present application relates to the field of welding, and in particular to a process method for realizing fine-wire argon arc welding. Background Art

[0002] The temperature measuring end of the platinum resistance sensor needs to connect a 0.02mm platinum wire with a 0.4mm nickel wire. At present, the main method used is brazing. However, the brazing process introduces a third material, which will affect the accuracy of the product and the response time of the product. If argon arc welding can be achieved, this problem can be effectively avoided. However, the argon arc welding connection of 0.02mm platinum wire and 0.4mm nickel wire has the following difficulties: 1. The wire is thin, and it is difficult to control the gap between the parts; 2. The platinum wire has low hardness and is easily damaged. It is not suitable for direct rigid contact with other metals, and heat dissipation cannot be achieved through bonding with other metals; 3. The welding process requires the use of a stable arc with low heat. At present, the argon arc welding method of 0.02mm platinum wire and 0.4mm nickel wire has not been realized in engineering application. Summary of the invention

[0003] In view of this, the present 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 0.02 mm platinum wire and 0.4 mm nickel wire.

[0004] The present application provides a process method for realizing fine wire argon arc welding using the following technical solution:

[0005] A process for realizing fine-wire argon arc welding comprises the following steps:

[0006] Winding a platinum wire around a nickel wire, and tying and fixing one end of the platinum wire to one end of the nickel wire;

[0007] A processing welding fixture, wherein the welding fixture comprises a metal block, and a through hole is provided on the metal block;

[0008] Inserting the platinum wire and the nickel wire into the through hole, and making the binding ends of the platinum wire and the nickel wire close to one end of the through hole, and the binding ends of the platinum wire and the nickel wire are spaced from the inner wall of the through hole;

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

[0010] The welding gun starts an arc from one side of the metal block and moves to the tied ends of the platinum wire and the nickel wire at the through hole. The arc edge melts the nickel wire 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 conical, 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, and the platinum wire and the nickel wire pass through the through hole from one side of the second section.

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

[0015] Optionally, during the process from when the welding gun starts arcing from one side of the metal block to when welding is completed, the welding current is 20±3A.

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

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

[0018] During welding, the welding gun and the metal block form a circuit, and the arc only appears on the surface of the metal block, which will not melt the thin wire inside the through hole. At the same time, the main heat of the arc is absorbed by the fixture, and only a small amount of heat will melt the nickel wire and platinum wire exposed outside the fixture, so there is no need to use other metal bonding to achieve heat dissipation; the argon arc welding gun starts the arc from the copper fixture, moves to the place to be welded, uses the edge of the arc to melt the nickel wire, and quickly leaves the nickel wire to complete the welding. When the argon arc welding arc is started, high-frequency oscillation is required to start the arc, the arc is unstable, and the current during the welding process is relatively stable. Through this method, the arc stability is guaranteed when welding thin wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of the welding gun, platinum wire, nickel wire, welding fixture and welding machine for this application;

[0021] Figure 2 Schematic diagram of the trajectory of the welding gun during the welding process of this application.

[0022] Explanation of the reference numerals: 1. platinum wire; 2. nickel wire; 3. metal block; 31. through hole; 4. welding gun; 5. welding machine. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0025] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an 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 described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0026] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

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

[0028] The embodiment of the present application provides a process method for realizing thin wire argon arc welding. The method of the present application is applicable to the welding of 0.02 mm platinum wire and 0.4 mm nickel wire.

[0029] like Figure 1 and Figure 2 As shown, a process method for realizing 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 manufactured, wherein the welding fixture comprises a metal block 3 , and a through hole 31 is provided on the metal block 3 .

[0032] The platinum wire 1 and the nickel wire 2 are inserted into the through hole 31, and the binding ends of the platinum wire 1 and the nickel wire 2 are close to one end of the through hole 31, and the binding ends of the platinum wire 1 and the nickel wire 2 are spaced 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 on the insulating seat to achieve the fixation of the nickel wire 2 and the platinum wire 1.

[0033] The welding gun 4 is connected to the positive electrode of the welding machine 5, and the metal block 3 is connected to the negative electrode of the welding machine 5. The welding machine 5 is a argon arc welding machine 5.

[0034] The welding gun 4 starts an arc from one side of the metal block 3, moves to the binding end of the platinum wire 1 and the nickel wire 2 at the through hole 31, melts the nickel wire 2 with the arc edge, 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 gun 4 and the platinum wire 1 or the nickel wire 2 is 3-6mm.

[0035] During welding, the welding gun 4 and the metal block 3 generate a loop, and the arc only appears on the surface of the metal block 3, and will not melt the thin wire inside the through hole 31. At the same time, the main heat of the arc is absorbed by the fixture, and only a small amount of heat will melt the nickel wire 2 and the platinum wire 1 exposed outside the fixture, so there is no need to use other metal bonding to achieve heat dissipation; the argon arc welding gun 4 starts the arc from the copper fixture, moves to the place to be welded, uses the edge of the arc to melt the nickel wire 2, and quickly leaves the nickel wire 2 to complete the welding. When the argon arc welding arc is started, high-frequency oscillation is required to start the arc, the arc is unstable, and the current during the welding process is relatively stable. Through this method, the arc stability is guaranteed when welding thin wires.

[0036] The method of the present application successfully realizes the argon arc welding connection between 0.02 platinum wire and 0.4 nickel wire, and the one-time welding qualified rate is as high as more than 90%, which can be applied to the product production and processing process.

[0037] Specifically, the conductivity of the metal block is 30-50 ms / m, the melting point of the metal block is 850-950 degrees Celsius, and 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 greater than the inner diameter of the second section. The transition section is conical. 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 pass through 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 is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A process for realizing fine wire argon arc welding, characterized in that: The steps include: Winding a platinum wire around a nickel wire, and tying and fixing one end of the platinum wire to one end of the nickel wire; Processing a welding fixture, the welding fixture comprising a metal block, the metal block being provided with a through hole; Inserting the platinum wire and the nickel wire into the through hole, and making the binding ends of the platinum wire and the nickel wire close to one end of the through hole, and the binding ends of the platinum wire and the nickel wire are spaced from the inner wall of the through hole; Connect the welding gun to the positive terminal of the welding machine and the metal block to the negative terminal of the welding machine; The welding gun starts an arc from one side of the metal block and moves to the tied ends of the platinum wire and the nickel wire at the through hole. The arc edge melts the nickel wire and then leaves the nickel wire to complete the welding.

2. The process for realizing 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 for realizing thin wire argon arc welding according to claim 1, characterized in that: The metal block is made of copper.

4. The process for realizing 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 greater than the inner diameter of the second section. The transition section is conical. 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 pass through the through hole from one side of the second section.

5. The process for realizing 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 for realizing fine wire argon arc welding according to claim 1, characterized in that: The welding current is 20±3A during the process of the welding gun starting the arc from one side of the metal block to completing the welding.

7. The process for realizing fine wire argon arc welding according to claim 1, characterized in that: During welding, the shortest distance between the welding gun and the platinum wire or nickel wire is 3-6 mm.

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