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Magnesium alloy laser surface reinforced repairing method

A technology of surface strengthening and repairing method, which is applied in the field of metal surface repairing, can solve the problems of increased production cost, shrinkage cavity, high chemical activity, etc., and achieve the effects of saving money, easy operation and simple process method

Inactive Publication Date: 2005-06-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high chemical activity of magnesium alloys, defects such as porosity, pores, cracks, and shrinkage cavities are prone to occur in the process of casting and processing (because the production methods of magnesium alloys are casting and deformation), which leads to a decrease in product qualification rate, not only Increase production costs and sometimes lead to timely delivery of critical components such as aerospace and military
[0003] Because magnesium alloys are not resistant to corrosion, corrosion pits will be formed on magnesium alloys during use, which seriously affects the safety and reliability of the entire aircraft
Since the magnesium alloys used in aerospace and missiles are mostly thin-walled parts and finished parts, argon arc welding cannot be used for repairs. In order to ensure flight safety, they had to be scrapped because of small corrosion pits. processing, and magnesium alloy parts used in aircraft are generally more expensive
[0004] Similarly, because the magnesium alloy is not wear-resistant, it will cause damage or scratches on its surface during processing and transportation. In the process of processing, if the operation is a little careless, an extra hole may be processed on the magnesium alloy. or undesired configurations
If it cannot be dimensionally restored, the entire part will be scrapped

Method used

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  • Magnesium alloy laser surface reinforced repairing method
  • Magnesium alloy laser surface reinforced repairing method
  • Magnesium alloy laser surface reinforced repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For ZM5 magnesium alloy surface laser repair, the same magnesium alloy repair material is used to cover the defect. The specific steps are as follows:

[0025] 1. The cover layer is 0.6-10 mm higher than the surface defect, and the edge line of the cover layer is 0.1-5 mm outside the corresponding edge line of the surface defect, and is irradiated with laser light to obtain the required strengthening repair layer.

[0026] 2. Placement of restoration materials: use mechanical fixtures (such as tweezers and other tools) to clamp / position or place directly, and then use laser irradiation.

[0027] 3. Laser irradiation: using a pulsed laser, the wavelength of the pulsed laser is 1.06 microns, the average laser power is 400W, the energy of each pulse is 30J, the pulse width is 1-5ms, the diameter of the scanning focused beam spot is 1mm, and the pulse frequency is 10Hz. The scanning speed is 3-5mm / s; under the protection of argon gas, the laser is aimed at the edge line of ...

Embodiment 2

[0032] The difference from Example 1 is:

[0033] Laser repair of ZM2 magnesium alloy surface, using the same magnesium alloy repair material, place the repair material directly on the repair surface, laser irradiation adopts pulse laser, the pulse laser wavelength is 1.06 microns, the average laser power is 500W, the energy of each pulse action 15J, the pulse width is 3-5ms, the scanning focused beam spot diameter is 0.5mm, the pulse frequency is 3Hz, and the scanning speed is 4-6mm / s; under the protection of argon, use the laser to align the edge line of the repair material covering layer, and then start Scanning, repeated irradiation of the beam to form a laser casting layer, followed by grinding, testing, polishing and other processes to complete the magnesium alloy surface strengthening repair.

[0034] Such as figure 2 Shown is a low magnification (100×) metallographic image of the ZM2 magnesium alloy surface laser repaired.

[0035] We repaired the galvanic corrosion...

Embodiment 3

[0037] The difference from Example 1 is:

[0038] Laser repair of ZM6 magnesium alloy surface, the same magnesium alloy repair material is used, the repair material is placed directly on the repair surface, laser irradiation adopts a pulsed laser, the pulse laser wavelength is 1.06 microns, the average output power is 400W, and the scanning focused beam spot diameter is 2mm , scanning speed 5mm / s, pulse frequency 4Hz, pulse width 2-6ms. Under the protection of helium, the laser is aligned to repair the edge line of the material covering layer, and then scanning is started. The beam is irradiated repeatedly to form a laser casting layer, and then grinding, testing, polishing and other processes are carried out to complete the magnesium alloy surface strengthening repair.

[0039] Such as image 3 Shown is a low magnification (50×) metallographic image of the laser repaired ZM6 magnesium alloy surface.

[0040] The surface scratches of the aircraft rear gearbox casing (ZM6) re...

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Abstract

The invention provides a magnesium alloy surface laser reinforcing and repairing method which comprises, using magnesium alloy material and laser beam, under atmospheric condition, protecting by using argon (or the mixed gas of helium, argon), and carrying out magnesium alloy reinforced restoring. The advantages of the invention includes, no complex apparatus such as vacuum chamber is needed, and no heat damage to magnesium alloy.

Description

technical field [0001] The invention belongs to a metal surface repair method, in particular to a magnesium alloy laser surface strengthening repair method. Background technique [0002] Due to the high chemical activity of magnesium alloys, defects such as porosity, pores, cracks, and shrinkage cavities are prone to occur in the process of casting and processing (because the production methods of magnesium alloys are casting and deformation), which leads to a decrease in product qualification rate, not only This increases production costs and sometimes results in timely delivery of critical components such as aerospace and military. [0003] Since the magnesium alloy is not resistant to corrosion, corrosion pits are formed on the magnesium alloy during use, which seriously affects the safety and reliability of the entire aircraft. Since the magnesium alloys used in aerospace and missiles are mostly thin-walled parts and finished parts, argon arc welding cannot be used for ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 王茂才陈长军王东生
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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