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Method of improving fatigue strength of aluminum alloy welding joint

A fatigue strength, aluminum alloy technology, applied in the field of aluminum alloy welding, can solve problems such as low efficiency and complicated process

Inactive Publication Date: 2013-05-22
鞍山煜宸科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The current laser shock peening process uses the high-density energy generated by the pulsed laser to impact the entire weld surface to be processed bit by bit, which has the disadvantages of complex process and low efficiency.

Method used

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  • Method of improving fatigue strength of aluminum alloy welding joint
  • Method of improving fatigue strength of aluminum alloy welding joint
  • Method of improving fatigue strength of aluminum alloy welding joint

Examples

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Embodiment

[0025] Example: A fatigue strength improvement test was performed on the welds of aluminum alloy A6061-T6 specimens.

[0026] The MIG welding test conditions and process parameters are as follows:

[0027] (1) Plate: A6061-T6 size 260×80×6mm (rectangular);

[0028] (2) Welding wire: A4043-WY φ1.2mm;

[0029] (3) Welding current 200A; welding voltage 21V; welding speed 0.5m / min; Ar gas flow rate 25L / min; V-shaped groove.

[0030] Before impact treatment, clean the weld with acetone, and coat the absorption layer-black paint on the left and right sides of the weld toe within a range of about 3.5mm; fix the test piece on the fixture and place it in the constrained layer (water layer).

[0031] Laser surface impact treatment conditions: laser type Nd:YAG laser, wavelength 532nm, frequency 60Hz, laser pulse width 8ns, single pulse energy 100mJ, focus spot diameter 0.6mm, laser pulse peak power density is about 4.5GW / cm 2 , The overlap area of ​​the surface spots is 35%, and the pulse energy d...

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Abstract

The invention relates to the field of aluminum alloy welding joint, in particular to a method of improving fatigue strength of the aluminum alloy welding joint. The method of improving the fatigue strength of the aluminum alloy welding joint is characterized in that the fatigue strength of the aluminum alloy welding joint is improved due to the fact that laser is used for shocking two side areas of the aluminum alloy welding joint. The method of improving the fatigue strength of the aluminum alloy welding joint includes a first step of washing the welding joint with acetone before processing, coating a carbon black paint coating layer on an area with a 3mm-4mm width at two sides of an aluminum alloy test piece weld toe, and sinking a test piece into water; a second step of adjusting a focus lamp to guarantee a restraint layer to be 50-80mm in the water, shocking the area with the 3mm-4mm width at two sides of the test piece weld toe, wherein the parameters are as follows: the laser wave length is 532nm-535nm, the laser frequency is 60Hz, the monopulse laser energy is 100mJ-120mJ, and the laser pulse peak power density is about 4.5 GW / cm -5GW / cm. Compared with the prior art, the method of improving the fatigue strength of the aluminum alloy welding joint has the advantages of being small in shocking area and greatly improving the shocking strengthening efficiency when being compared with a shocking strengthening technology of the whole welding joint.

Description

Technical field [0001] The invention relates to the field of aluminum alloy welding, in particular to a method for improving the fatigue strength of aluminum alloy welds. Background technique [0002] At present, the main welding process method of aluminum alloy is MIG welding. Its common defects are joint cracks, softening and hardness reduction. The fatigue strength of welds is greatly reduced. The traditional methods to improve the hardness and fatigue strength of aluminum alloy welds are Shot peening, rolling, hammering, etc. With the rise of laser technology, the application of laser shock strengthening technology in strengthening materials and welding seams has become more and more extensive. The weld toe is the junction of the weld meat and the base metal, and is the weakest link of the welded joint. Cracks often occur due to the high residual tensile stress after welding. [0003] The United States LLNL (Lawrence Livermore National Laboratory) cooperated with MIC to condu...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/42B23K26/60
Inventor 徐国建杭争翔王虹刘祥宇唱丽丽
Owner 鞍山煜宸科技有限公司
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