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Gas flow waveform modulation variable polarity plasma welding method

A plasma welding and polarity changing technology, which is applied in plasma welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of poor thermal electron emission capability, serious heat loss, arc divergence, etc., to improve stability and strengthen cooling , Increase the effect of ion gas flow

Active Publication Date: 2015-08-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the workpiece is a cold cathode, the thermal electron emission ability is poor, so the cathode spot jumps and the arc diverges
During the period of reverse polarity, the tungsten electrode receives electrons and absorbs the work function, and the heating and burning loss is more serious than that of the positive polarity period.

Method used

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Embodiment 1

[0030] A kind of gas flow waveform modulation variable polarity plasma welding method in this embodiment, the specific operation is as follows

[0031] Step 1: Before welding, after grinding and cleaning the parts to be welded (4mm thick aluminum alloy), fix them on the welding fixture;

[0032] Step 2: Follow the figure 1 As shown, connect the circuit and gas circuit, make the plasma torch vertical to the upper part of the part to be welded, and connect the air flow waveform controller and ion gas control execution unit into the system;

[0033] Step 3: Set welding process parameters: welding current 80 / 120A, welding speed 0.1m / min, arc height 4mm, shielding gas flow 18L / min, ion gas flow 3L / min and 4L / min, shielding gas and ion gas Use 99.99% argon gas, the time ratio of positive and negative polarity is 21ms:4ms;

[0034] Step 4: Select the time node in a single cycle of the variable polarity current waveform to set the key time point t in the airflow waveform controller ...

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Abstract

A gas flow waveform modulation variable polarity plasma welding method belongs to the technical field of welding methods. According to the invention, a regular plasma arch welding device is added with a gas flow waveform controller and a plasma gas control execution unit; the waveform output of the plasma gas flow can be realized during the welding process by controlling the plasma gas control execution unit; and the plasma gas flow is synchronously changed with the current during the welding process of the variable polarity plasma, so that the control of stability of the welding process and piercing can be realized. According to the invention, the stability of piercing and the welding process of the variable polarity plasma can be greatly improved and the stability is improved, so the quality of weld seam is conducive to be increased.

Description

technical field [0001] The invention relates to a plasma welding method with modulating air flow waveform and variable polarity, and belongs to the field of welding methods. Background technique [0002] Since Vasily Petrov discovered the phenomenon of continuous discharge in 1802 and proposed the application potential of arc in material processing, with the development of arc welding power supply and welding materials, a large number of different arc welding processes have emerged one after another, such as submerged arc welding , argon tungsten arc welding, gas metal arc welding, plasma arc welding, etc., and has penetrated into various fields such as automobiles, machinery manufacturing, military, aerospace and civilian daily life, playing an increasingly important role. With the development of science and technology, new welding methods such as laser welding, friction stir welding and magnetic pulse welding have gained great attention in the welding field in recent years...

Claims

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Application Information

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IPC IPC(8): B23K10/02
CPCB23K10/02
Inventor 蒋凡张瑞英陈树君肖珺闫朝阳管金栋
Owner BEIJING UNIV OF TECH
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