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A low-power laser high-efficiency welding method based on microbeam plasma arc induction

A technology of micro-beam plasma and plasma arc, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the difficulty of welding efficiency, welding energy consumption and manufacturing cost, and it is difficult to achieve high-efficiency deep penetration welding , Affect welding efficiency and penetration quality and other issues, to achieve the effect of low power laser deep penetration welding, excellent arc stability and conductivity, and inhibit instability

Active Publication Date: 2017-07-07
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for light alloy materials such as aluminum alloy, due to the high thermal conductivity and electrical conductivity of the material, the reflectivity of the laser is high, so that the absorption rate of the material to the laser energy is low, which affects the welding efficiency and penetration quality. Especially in laser welding
Therefore, for light alloy materials such as aluminum alloys, regardless of whether micro-beam plasma arc welding or low-power pulsed laser welding is used, although energy consumption is low, it is difficult to achieve high-efficiency deep penetration welding.
Based on the above situation, it seems difficult to achieve a balance between welding efficiency, welding energy consumption and manufacturing cost

Method used

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  • A low-power laser high-efficiency welding method based on microbeam plasma arc induction
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  • A low-power laser high-efficiency welding method based on microbeam plasma arc induction

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Experimental program
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Effect test

Embodiment 1

[0029] The workpieces to be welded are two 4mm thick AZ31B magnesium alloy sheet structural materials with I-shaped groove butt, the tungsten electrode used is cerium tungsten electrode, the electrode connection method is that the tungsten electrode is connected to the negative electrode of the power supply, and the workpiece is the anode connected to the positive electrode of the power supply. The main arc current of the micro-beam plasma arc is 40A, the peak power of the pulsed laser is 5kW, the pulse width is 6ms, the angle between the laser beam and the vertical plane is 5°, and the exit direction of the micro-beam plasma arc 9 forms an angle of 25° with the laser beam. The protective gas and working gas used by the micro-beam plasma arc and laser are pure argon, and the protective gas flow rate is 15L / min. When welding, first correct the relative position of the laser welding torch 4 and the micro-beam plasma arc welding torch 7 so that the angle between the laser beam and ...

Embodiment 2

[0032] The workpiece to be welded is two 3mm thick TC4 titanium alloy sheet structural material I-shaped groove butt joints, the tungsten electrode used is cerium tungsten electrode, the electrode connection method is that the tungsten electrode is connected to the negative electrode of the power source, and the workpiece is the anode to the positive electrode of the power source. The main arc current of the micro-plasma arc is 35A, the peak power of the pulsed laser is 5.5kW, the pulse width is 6ms, the angle between the laser beam 8 and the vertical plane is 5°, and the exit direction of the micro-plasma arc 9 is 25° with the laser beam 8 Angle. The shielding gas 6 and working gas 5 used by the micro-beam plasma arc and the laser are pure argon, and the shielding gas flow rate is 20L / min. Correct the relative position of the laser welding torch 4 and the micro-beam plasma arc welding torch 7, and take the welding advancement direction 11 as a reference, make the micro-beam pl...

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Abstract

The invention discloses a high-efficiency welding method utilizing a low-power laser based on the induction of a microbeam plasma arc. According to the high-efficiency welding method disclosed by the invention, the induction effect and the heat auxiliary effect of the microbeam plasma arc on a laser plasma body are utilized, so that suppression of the instability of a keyhole effect is realized, and the thermal absorptivity of materials to the energy of a laser heat source is increased. According to the high-efficiency welding method disclosed by the invention, the current range of a main arc of the adopted microbeam plasma arc is 20A-50A, the power range of a pulse peak value of a pulse laser beam is 5kW-10kW, the relative positions and the beam spot superposition degree of the laser beam and the microbeam plasma arc, and the output energy of the micro plasma arc and the output energy of the laser beam are adjusted, so that the highest energy efficiency of a low-power pulse laser heat source is fully activated, and the welding parameter range within which the low-power laser obtains a stable penetration fusion welding effect is extended. Through the adoption of the high-efficiency welding method disclosed by the invention, high-efficiency penetration fusion welding of common metal materials can be realized, and the high-efficiency welding method is particularly suitable for the welding of light alloy materials of aluminum alloys, magnesium alloys and the like, and is high in efficiency and low in energy consumption.

Description

Technical field [0001] The invention relates to a laser welding method, which is suitable for high-efficiency welding of commonly used metal sheet structural materials, and is particularly suitable for welding of aluminum alloys, magnesium alloys and other materials with high reflectivity to laser energy. Background technique [0002] Due to the need for environmental protection and energy saving, the lightweight of vehicles such as automobiles has become a trend of development, making the popularization and application of light alloy materials such as aluminum alloys and magnesium alloys in the manufacturing of vehicles an inevitable trend. Light alloy materials such as aluminum alloy have high thermal conductivity and electrical conductivity. In the manufacturing process, relatively higher welding energy needs to be provided to achieve high-efficiency and high-quality welding. This undoubtedly increases energy consumption and increases the production Energy costs. With the rap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348B23K101/18
CPCB23K26/348B23K2101/185
Inventor 罗怡谢小健韩静韬朱亮丁宇贾立成翟研炎
Owner CHONGQING UNIV OF TECH