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Combination device capable of achieving underwater laser welding and laser shot blasting

A laser shot peening and combined device technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of increasing the difficulty of operation and poor continuity, and achieve the effect of high processing efficiency, ingenious structure and strong continuity

Inactive Publication Date: 2014-01-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above technologies are very effective for the repair, protection and inspection of the internal components of the nuclear reaction, but every time the workpiece is repaired, the continuity of laser welding, laser peening and subsequent inspection operations is poor, which greatly increases the difficulty of the operation

Method used

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  • Combination device capable of achieving underwater laser welding and laser shot blasting
  • Combination device capable of achieving underwater laser welding and laser shot blasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A prefabricated artificial crack with an opening width of 0.3 mm, a length of 10 mm, and a depth of 3 mm is made on 316L stainless steel, and a combined device is used for underwater laser welding of the crack. First connect the combination device with external equipment including control system, laser generator and oscilloscope, select 82 aluminum alloy as welding rod to fill into the electrode filling device 5, place the combination device underwater, cover the position to be processed, and make the sealing cover The mouth of the trachea 15 in the cavity 9 is always on the top to ensure that the air in the sealed cover cavity 9 can be discharged; the water-argon inlet 2 is controlled to fill the sealed cover cavity 9 with argon as a protective gas, and the water in the sealed cover cavity 9 is discharged. After emptying, the welding rod filling device 5 extends the welding rod to the position to be welded. The laser pulse wavelength is adjusted to 1060nm, the laser ene...

Embodiment 2

[0027] Laser peening on 304L stainless steel using a combination unit. First, connect the combination device with external equipment including control system, laser generator and oscilloscope, place the combination device underwater, cover the position to be processed, and make the mouth of the air pipe 15 in the cavity 9 of the sealed cover always on the top to ensure sealing The air in the cover cavity 9 can be discharged; open the valve 14, control the water and argon inlet 2 to fill the sealed cover cavity 9 with water as a confinement layer, and after the gas is discharged, adjust the laser pulse wavelength to 532nm, the pulse width to 8ns, and the spot diameter to 0.7mm , pulse energy 70mJ, energy density 7000 pulse / cm2 . After laser peening, the residual stress of 304L stainless steel increases significantly.

Embodiment 3

[0029] A 40×40mm piece of 304L stainless steel has a known defect of 0.2mm in size, which is detected by laser ultrasonic testing using a combination device. First connect the combination device with external equipment including control system, laser generator and oscilloscope, place the combination device underwater, cover the position to be detected, and make the mouth of the air pipe 15 in the cavity 9 of the sealed cover always on the top to ensure sealing The air in the cover cavity 9 can be discharged; open the valve 14, control the water and argon inlet 2 to fill the sealed cover cavity 9 with water as a confinement layer, after the gas is discharged, adjust the laser pulse wavelength to 1064nm, the laser energy to 45mJ / pulse, and move the combination The device completes the detection of the entire area, and locates the defect position by observing two oscilloscopes connected with the ultrasonic detection device 3 . When there is a defect between the laser irradiation ...

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Abstract

The invention discloses a combination device capable of achieving underwater laser welding and laser shot blasting. A laser welding-shot blasting component, an ultrasound detecting device, a water-argon inlet and a welding strip filling device are mounted on the same sealing cover which is placed underwater. Two functions of laser welding and laser shot blasting are achieved, and laser ultrasound detecting can be directly carried out on a workpiece after processing. By setting different laser wavelengths and sealing cover cavity inner environments, different functions can be used. During laser welding, a sealing cover cavity is filled with argon through the water-argon inlet. During laser shot blasting, the sealing cover cavity is filled with water through the water-argon inlet. The combination device is ingenious in structure, easy to operate, strong in adaptability, high in machining efficiency, capable of being used for alternating or continuous working of underwater welding and laser shot blasting and especially suitable for working under a special environment and defect repairing under the situation that the face where a defect exists is small in area.

Description

[0001] technical field [0002] The invention relates to the field of laser processing, in particular to a combined device integrating underwater laser welding and laser shot peening, which is especially suitable for working in special environments and repairing defects with a small surface area. Background technique [0003] In nuclear power plants, reactor pressure vessel internals are one of the most important components. According to reports, cracks caused by stress corrosion cracking (SCC) have been found in reactor internals installed in reactor (pressure) vessels in recent years. Most of the cracks occur in narrow parts, and at the same time, the radiation damage during work in nuclear power plants also makes it difficult to approach the construction target parts. In 2005, M. Tamura of Toshiba Corporation of Japan and others invented an underwater laser welding technology, by sending shielding gas (Ar) to the welding part to form a local cavity, and then using a laser...

Claims

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Application Information

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IPC IPC(8): B23K26/00B23K26/20C21D1/09C21D7/06
CPCB23K26/03B23K26/0652B23K26/1224B23K26/123B23K26/127B23K26/20B23K26/352B23K26/702
Inventor 罗开玉林通刘娟景祥
Owner JIANGSU UNIV
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