Laser-electric arc compound welding method suitable for high strength aluminum alloy downward welding

A compound welding and aluminum alloy technology, which is applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of non-compressed arc divergence, joint strength reduction, and large fluctuation of reinforcement, so as to improve joint softening , Welding efficiency improvement, welding quality improvement effect

Pending Publication Date: 2019-12-20
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing single-pass laser arc hybrid welding method has the following disadvantages: 1) the penetration ability of the welded plate is relatively weak; Increasing the welding current will lead to high heat input and reduced joint strength; 2) The high-strength aluminum alloy welded joint softens severely, the non-compressed arc is relatively divergent, and the welding heat input is

Method used

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  • Laser-electric arc compound welding method suitable for high strength aluminum alloy downward welding
  • Laser-electric arc compound welding method suitable for high strength aluminum alloy downward welding
  • Laser-electric arc compound welding method suitable for high strength aluminum alloy downward welding

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Experimental program
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Effect test

Embodiment 1

[0037] The laser-polarity variable plasma arc composite welding method is used to weld 6mm thick 7075 aluminum alloy. The welding parameters are fiber laser power 1.55kW, variable polarity plasma arc positive polarity current 155A, reverse polarity current 190A, positive and negative polarity time ratio 21 : 4. The welding speed is 900mm / min, and the wire feeding speed is 6m / min; before welding, clean the workpiece to be welded. The cleaning method adopts mechanical grinding, and then fix the workpiece on the workbench with a fixture. Laser-polarity variable plasma arc hybrid welding test, while collecting the shape of the variable polarity plasma arc and arc electric signal, the collected signals are as follows: image 3 as shown in a.

Embodiment 2

[0039] Implant 200Hz high-frequency pulses into the variable polarity plasma arc, and conduct laser-double pulse variable polarity plasma arc composite welding test. The welding parameters are fiber laser power 1.55kW, variable polarity plasma arc positive polarity current 155A, reverse polarity current 190A, positive and negative polarity time ratio 21:4, welding speed 900mm / min, wire feeding speed 6m / min; before welding, clean the workpiece to be welded, the cleaning method is mechanical grinding, and then fix the workpiece on the workbench with a fixture Above, after the welding trajectory test is completed, the laser-pulse variable polarity plasma arc composite welding test is carried out on the 6mm thick 7075 aluminum alloy, and the shape of the variable polarity plasma arc and the electric arc signal are collected at the same time. The collected signals are as follows: image 3 as shown in b.

Embodiment 3

[0041] A 500Hz high-frequency pulse was implanted into the variable polarity plasma arc, and the laser-double pulse variable polarity plasma arc composite welding test was carried out. The welding parameters were fiber laser power 1.55kW, variable polarity plasma arc positive polarity current 155A, and reverse polarity current 190A, positive and negative polarity time ratio 21:4, welding speed 900mm / min, wire feeding speed 6m / min; before welding, clean the workpiece to be welded, the cleaning method is mechanical grinding, and then fix the workpiece on the workbench with a fixture Above, after the welding trajectory test is completed, the laser-pulse variable polarity plasma arc composite welding test is carried out on the 6mm thick 7075 aluminum alloy, and the shape of the variable polarity plasma arc and the electric arc signal are collected at the same time. The collected signals are as follows: image 3 as shown in c. The weld is formed as Figure 4 As shown, the weld sur...

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Abstract

The invention relates to a laser-electric arc compound welding method suitable for high strength aluminum alloy downward welding. By adopting a compound welding process of combining dipulse variable polarity plasma arc welding with laser welding, high, intermediate and low frequencies of pulse variable polarity plasma arc pulse currents are controllable by means of control: the high frequency pulse frequency is 200-1000 Hz, the low frequency pulse frequency is 1-5 Hz, and the power frequency is 40 Hz; the welding process parameters are as follows: the plasma current is 160-220 A, the electricarc voltage is 21-30 V, the arc height is 5-6 mm, the plasma welding gun angle is 45-60 degrees, and high purity argon protection is carried out; the laser power is 1.5-2.5 kw, the laser defocusing amount is -5-5 mm, and the laser beam is 5-10 degrees inclining to the side of the welding gun; and the electric arc is in front of the laser beam, the separation distance from light to tungsten is 3-6mm, and the welding speed is 480-1040 mm/min. The laser-electric arc compound welding method can reduce weld heat input and improve the welding efficiency.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a laser-arc composite welding method suitable for high-strength aluminum alloy flat welding. Background technique [0002] Variable polarity plasma is known as the defect-free welding of light alloys such as aluminum alloys, but due to its low welding efficiency, limited welding position, poor perforation formation in aluminum alloy flat welding, and severe tungsten electrode burning when welding medium and thick plates with high current , and the softening of high-strength aluminum alloy welded joints is more obvious. [0003] Due to the high energy density of the laser, it has a strong deep melting ability. Since the aluminum alloy laser welding has a high reflectivity to light and heat, the high temperature gradient of the laser welding energy leads to serious thermal crack defects, and strict requirements on assembly accuracy. And high-power lasers are expensive...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K103/10
CPCB23K26/348B23K2103/10
Inventor 韩永全洪海涛冯一萍杜茂华孙振邦
Owner INNER MONGOLIA UNIV OF TECH
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