Welding robot TIG welding auxiliary arcing device in high-resistance environment
By designing an auxiliary arc starting device in a high-resistance environment and using short-circuit current and arc voltage sensor control, the problem of the welding robot being unable to start an arc at high frequency was solved, and the stability and quality of welding were improved.
Patent Information
- Application Number
- CN202422542368.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-10-21
AI Technical Summary
In a high-resistance environment, the welding robot cannot ignite the arc through high-frequency arc starting, resulting in tungsten inclusion and poor weld formation in the weld when contact arc starting is used.
Abstract: An auxiliary arc starting device was designed, which included an arc starting device, an open spring washer, a flow guide, a tungsten electrode clamp, a tungsten needle, a welding gun and a ceramic nozzle. The short-circuit current was generated by the contact between the tungsten needle and the workpiece. The flow guide was used to conduct the electrical signal to ensure the arc stability. The movement of the welding robot was controlled by an arc voltage sensor to avoid direct contact between the tungsten needle and the workpiece.
The arc starting stability and reliability of the welding robot are improved, the welding quality is improved, weld defects are avoided, and the welding efficiency is improved.
Smart Images
Figure CN223476546U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of welding technology, and in particular relates to an auxiliary arc initiation device for TIG welding robots in high resistance environments. Background Technology
[0002] Existing welding robots perform argon arc welding within enclosed steel containers. These robots employ tungsten inert gas (TIG) welding, using high-frequency arc initiation. High-frequency arc initiation utilizes high-frequency voltage; by generating a high-frequency voltage between the electrode (usually a tungsten electrode) and the workpiece, the argon gas is broken down, becoming conductive. A continuous current is then supplied to maintain arc stability. This arc initiation method can be non-contact, avoiding potential damage from electrode-workpiece contact. Furthermore, the arc is relatively stable; once ignited, the arc remains stable due to the excellent protective effect of the argon gas, which is crucial for ensuring the continuity of the welding process and the quality of the weld.
[0003] However, due to the limitations of the working environment, the grounding wire of the welding power source is over 10 meters long and the grounding method is the overall grounding of the steel container. Therefore, this excessively long grounding wire and the overall grounding of the steel container result in increased overall resistance and increased current loss in the entire circuit. This leads to insufficient voltage during high-frequency arc ignition, making it impossible to break down the argon gas to ignite the welding arc. Therefore, contact arc ignition is the only way to solve the current predicament.
[0004] Due to the unique nature of the welding environment, high-frequency arc ignition is unstable, necessitating the use of contact arc ignition. Contact arc ignition involves bringing a tungsten electrode into contact with the workpiece to form a short circuit. Then, based on a pre-set arc voltage, the robot quickly increases the distance between the tungsten electrode and the workpiece, igniting the arc and maintaining it at a set height via an arc voltage sensor. During this process, the direct contact between the tungsten electrode and the workpiece generates a large welding current at the moment of short circuit, leading to localized overheating of the tungsten needle, resulting in wear and deformation. At the moment of contact, impurities and oxides on the surface of the tungsten needle can transfer into the weld, causing welding defects such as tungsten inclusions and poor weld formation. Utility Model Content
[0005] The technical problem to be solved by this utility model is that TIG welding cannot ignite the arc through high-frequency arc initiation, and welding defects such as tungsten inclusion and poor weld formation occur when contact arc initiation is used.
[0006] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:
[0007] A welding robot TIG welding auxiliary arc initiation device in a high resistance environment includes an arc initiation device, an open spring washer, a fluid guide, a tungsten electrode clamp, a tungsten needle, a welding torch, and a ceramic nozzle;
[0008] One end of the arc-initiating device is circularly wrapped around a raised cylindrical structure at the bottom of the guide fluid, and an open spring washer presses the arc-initiating device tightly onto the guide fluid.
[0009] The tungsten electrode clamp is placed inside the guide fluid, and the tungsten needle is clamped in the tungsten electrode clamp, ensuring the transmission of electrical signals between the arc initiation device and the tungsten needle; the guide fluid is then fixed to the welding torch by threads; the ceramic nozzle is the shell, which is sleeved on the outside of the guide fluid; the other end of the arc initiation device is led out close to the inner wall of the ceramic nozzle and contacts the surface of the workpiece; the welding torch is fixed on the robotic arm of the welding robot.
[0010] Furthermore, the arc-initiating device is made of bent tungsten wire.
[0011] Furthermore, the diameter of the tungsten wire is 2 mm.
[0012] Furthermore, the tungsten needle extends out to guide the fluid.
[0013] Furthermore, the ceramic nozzle and the fluid guide are fixed by threads.
[0014] This invention has the following advantages: it can be applied to high-resistance welding environments or welding environments where high-frequency arc initiation is not possible due to surface insulation caused by oxidation of welding materials. It improves the stability and reliability of robot arc initiation, improves welding quality and welding efficiency, and avoids welding defects such as tungsten inclusions and poor weld formation caused by contact arc initiation. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the auxiliary arc-initiating device of this utility model;
[0016] The markings in the diagram are as follows: 1-Arc initiation device, 2-Open spring washer, 3-Flow guide, 4-Tungsten electrode clamp, 5-Tungsten needle, 6-Welding torch, 7-Ceramic nozzle. Detailed Implementation
[0017] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.
[0018] like Figure 1 As shown, the TIG welding auxiliary arc-starting device for welding robots in high-resistance environments of this invention includes an arc-starting device, an open spring washer, a fluid guide, a tungsten electrode clamp, a tungsten needle, a welding torch, and a ceramic nozzle. A detailed structural schematic diagram is shown below. Figure 1 As shown:
[0019] The arc-initiating device 1 consists of a φ2.0 tungsten wire. One end of the tungsten wire is circular and fixed to the raised cylindrical structure of the guide fluid 3, and is pressed against the guide fluid 3 by an open spring washer 2 to ensure a firm contact between the tungsten wire and the guide fluid 3. Then, the tungsten electrode clamp 4 is inserted into the guide fluid 3 and the tungsten needle 5 is inserted into the tungsten electrode clamp 4 to ensure the transmission of electrical signals between the arc-initiating device 1 and the tungsten needle 5. The guide fluid 3 is then fixed to the welding torch 6 by threads. During the tightening process, the length of the tungsten needle 5 extending out of the guide fluid 3 should be adjusted. After tightening the threads, the tungsten electrode clamp 4 should clamp the tungsten needle 5 tightly and should not wobble. Next, the ceramic nozzle 7 is fixed to the guide fluid 3 by threads, and the other end of the arc-initiating device 1 is led out close to the inner wall of the ceramic nozzle 7 and adjusted to a suitable length for contacting the workpiece surface. Since the welding torch 6 is fixed to the welding robot arm, the movement trajectory of the welding torch can be controlled by robot programming.
[0020] The specific usage involves the following four steps:
[0021] 1. When starting the welding operation, use the teach pendant to control the movement of the welding robot and move the welding torch 6 to the part to be welded;
[0022] 2. The tungsten needle 5 inside the welding torch 6 is aligned with the weld seam to be welded, and when the distance between the tungsten needle and the workpiece is 3-4mm, the arc-starting device 1 makes contact with the workpiece to be welded.
[0023] 3. When the welding robot sends out the arc ignition signal, the welding current comes into contact with the workpiece through the arc ignition device 1, instantly forming a large short-circuit current, which is then conducted to the tungsten electrode clip 4 and tungsten needle 5 through the conductor 3, causing the tungsten needle 5 to ionize the argon gas and ignite the electric arc.
[0024] 4. At the moment the tungsten needle 5 ignites the electric arc, the arc pressure sensor starts to work and controls the welding robot to raise the welding torch according to the set arc pressure value, so that the arc ignition device 1 is separated from the workpiece, and the welding robot begins to perform formal welding according to the predetermined programmed trajectory.
[0025] Key points of this embodiment:
[0026] 1. The arc-initiating device is fixed to the fluid conductor by an open spring washer, which makes it easier to conduct the short-circuit current to the tungsten needle to ignite the arc at the moment of arc initiation;
[0027] 2. Because the arc-starting device is fixed to the guide fluid by an open spring washer, it is easier to replace if the arc-starting device is damaged during use;
[0028] 3. Because the arc-initiating device is fixed on the guide fluid of the welding torch nozzle, it changes in real time with the movement of the welding torch. During the welding operation, the arc-initiating device will not come into contact with the workpiece due to changes in the welding torch posture and welding space position.
[0029] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the protection scope of the present invention.
Claims
1. A welding robot TIG welding auxiliary arc initiation device in a high-resistance environment, characterized in that, Includes arc initiation device, open spring washer, fluid guide, tungsten electrode clamp, tungsten needle, welding torch, and ceramic nozzle; One end of the arc-initiating device is circular and wrapped around the raised cylindrical structure at the bottom of the guide fluid. An open spring washer presses the arc-initiating device tightly onto the guide fluid. The tungsten electrode clamp is placed inside the guide fluid, and the tungsten needle is clamped in the tungsten electrode clamp, ensuring the transmission of electrical signals between the arc initiation device and the tungsten needle; the guide fluid is then fixed to the welding torch by threads; the ceramic nozzle is the shell, which is sleeved on the outside of the guide fluid; the other end of the arc initiation device is led out close to the inner wall of the ceramic nozzle and contacts the surface of the workpiece; the welding torch is fixed on the robotic arm of the welding robot.
2. The TIG welding auxiliary arc initiation device for welding robots in high-resistance environments according to claim 1, characterized in that, The arc-initiating device is made of bent tungsten wire.
3. The TIG welding auxiliary arc initiation device for welding robots in high-resistance environments according to claim 2, characterized in that, The tungsten wire has a diameter of 2 mm.
4. The TIG welding auxiliary arc initiation device for welding robots in high-resistance environments according to claim 1, characterized in that, The tungsten needle extends to guide the fluid.
5. The TIG welding auxiliary arc initiation device for welding robots in high-resistance environments according to claim 1, characterized in that, The ceramic nozzle and the fluid guide are fixed by threads.