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Laser welding incident angle real-time control system and welding method based on temperature feedback

A technology of laser welding and temperature feedback, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of low melting point and burn-through, and achieve the effect of increasing the incident distance and preventing burn-through

Active Publication Date: 2021-06-01
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The invention is mainly aimed at some specific structures. Due to the different thickness of the board, the thermal conductivity characteristics are also different in different positions. At the same time, the melting point of the material is relatively low, and the board is relatively thin. Some alloys that are particularly sensitive to laser heat input, such as Aluminum alloys and magnesium alloys are prone to burn-through when high-energy-density welding such as laser welding is used
[0003] A large number of tests have shown that when the welding temperature in a specific area exceeds a certain value, welding defects such as burn-through will occur, and because the welding parameters are set, they cannot be changed at any time when they encounter high temperatures during the welding process, so it is easy to cause burn-through and so on

Method used

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  • Laser welding incident angle real-time control system and welding method based on temperature feedback
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  • Laser welding incident angle real-time control system and welding method based on temperature feedback

Examples

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Effect test

Embodiment 1

[0047] The invention performs optical fiber laser welding on the die-casting aluminum alloy heater cover plate structure of the battery of the new energy vehicle. The thickness of the aluminum alloy heater cover plate is 3mm, and the welding is carried out in the butt joint method. Argon gas is used as the shielding gas for welding. The initial laser welding incident angle is 45mm / s, and the initial laser welding incident angle is set to 8°. According to the computer display, when the temperature thermometer detects about 440°C, the angle has not changed. As the temperature exceeds 440°C and continues to increase, the infrared measurement The temperature meter feeds back to the control module, and the control module issues instructions, the incident angle of laser welding begins to decrease, and finally maintains at about 525°C, and the incident angle of laser welding is about 6°. It was found that the weld was well formed, and there were no defects such as blast holes and por...

Embodiment 2

[0049] The invention performs optical fiber laser welding on the back cover of a 7000 series aluminum alloy mobile phone of a certain brand. Butt joint welding is adopted, argon is used as protective gas for welding, the gas flow is set to 15L / min, the thickness of the back cover is about 2.5mm, the defocus is -2mm, the laser power is set to 2200W, and the welding speed is 50mm / min s, set the initial laser welding incident angle to 7°, according to the computer display, when the temperature is below about 470°, the laser incident angle is in a constant state, as the welding progresses, the temperature in a specific area continues to rise, reaching and After exceeding 470°, the control module gives feedback, the laser incident angle is changed, the welding temperature is finally maintained at 575°C, and the display angle is 5.5°. According to the welding results, the welds around the cover plate are well formed, without defects such as collapse, blast holes, and pores, and the ...

Embodiment 3

[0051] The invention performs optical fiber laser welding on the 6061 aluminum alloy cooling system of a communication equipment integrated circuit of Huawei. Butt joint welding is adopted, argon is used as shielding gas for welding, gas flow is set to 15L / min, defocus is set to -2mm, cover plate thickness is 4mm, laser power is set to 2400W, welding speed is 30mm / s, The initial welding incident angle is set to 9°. Through the observation of the computer, it is found that the temperature detected by the thermometer is always below 415°C, so the control module has not issued an instruction to adjust the angle. After the welding is completed, it can be found that the overall shape of the weld is good, the weld pattern is clear, and there are no obvious defects such as undercut, weld bumps, pores, slag inclusions, etc. According to the cutting results, it is found that there are no defects such as burn-through, which conforms to the comprehensive mechanical properties, such as F...

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Abstract

The invention discloses a laser welding incident angle real-time control system based on temperature feedback and a welding method thereof. The welding system includes a laser welding module, a welding control module, a holder and an infrared temperature feedback module installed on the side wall of the laser welding module. One end of the device is fixed on the side wall of the laser welding module, and the other end is connected to the infrared temperature feedback module, and the angle of the infrared temperature feedback module is adjusted through the clamping end of the clamp, so that the infrared thermometer can measure the temperature of a specific area; the present invention Through the above real-time control system, the average temperature of a specific area can be detected in real time. If the temperature is too high, the system will give feedback accordingly, adjust the incident angle of laser welding, increase the incident distance of the laser in the material, and effectively prevent burn-through. happened. The invention is especially suitable for welding of thin cover plate structures such as aluminum and magnesium alloys.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a welding system and a welding method based on a temperature feedback-based laser incident angle of a cover plate structure that can be regulated in real time. Background technique [0002] The invention is mainly aimed at some specific structures. Due to the different thickness of the board, the thermal conductivity characteristics are also different in different positions. At the same time, the melting point of the material is relatively low, and the board is relatively thin. Some alloys that are particularly sensitive to laser heat input, such as Aluminum alloys and magnesium alloys are prone to burn-through when high-energy-density welding such as laser welding is used. [0003] A large number of tests have shown that when the welding temperature in a specific area exceeds a certain value, welding defects such as burn-through will occur, and because the welding parame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/03B23K26/24
CPCB23K26/034B23K26/24
Inventor 李瑞峰徐诚禹杭陈书锦刘彬浦娟
Owner JIANGSU UNIV OF SCI & TECH
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