Method and apparatus for laser shock processing of weldment at ultralow temperature

A technology of laser shock strengthening and laser welding, which is applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of strict welding process requirements, and achieve the effects of achieving consistency, increasing dislocation density, and improving toughness

Active Publication Date: 2012-10-17
ZHANGJIAGANG FURUI SPECIAL EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

This method has relatively strict requirements on the welding process, and does not involve the optimization of welded parts that have been welded in an ultra-low temperature environment

Method used

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  • Method and apparatus for laser shock processing of weldment at ultralow temperature
  • Method and apparatus for laser shock processing of weldment at ultralow temperature
  • Method and apparatus for laser shock processing of weldment at ultralow temperature

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Embodiment Construction

[0034] The embodiment of the present invention discloses a method for laser shock strengthening of welded parts in an ultra-low temperature environment, including:

[0035] (1) Provide a weldment that has a weld zone;

[0036] (2) Dip the welded piece into liquid nitrogen, and perform laser shock strengthening treatment on the weld seam area.

[0037] Correspondingly, the present invention also discloses a laser welding device, comprising:

[0038] The ultra-low temperature control device includes a liquid nitrogen storage tank, the liquid nitrogen storage tank contains liquid nitrogen, and the welding parts are immersed in the liquid nitrogen;

[0039] The laser strengthening device emits laser beams and performs laser shock strengthening treatment on the weld seam area.

[0040] The weldment is placed in a liquid nitrogen ultra-low temperature environment. Liquid nitrogen is used as a low-temperature auxiliary environment and as a confinement layer in the process of laser ...

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Abstract

The invention discloses a method and an apparatus for laser shock processing of a weldment at an ultralow temperature and aims to improve mechanical properties and corrosion resistance of a weldment through laser shock processing of the weldment at an ultralow temperature. According to the invention, the weldment is disposed in liquid nitrogen at an ultralow temperature, and the colorless transparent liquid nitrogen is used as a low temperature auxiliary environment and as a restraint layer for laser shock processing; thus, on the one hand, the apparatus for laser shock processing at an ultralow temperature is simplified, and on the other hand, laser shock processing of the weldment at an ultralow temperature is realized and the weldment serves at a same temperature, which guarantees consistency of the processing environment and the service environment of the weldment and thus enabling toughness, corrosion resistance and other mechanical performances of the weldment at an ultralow temperature to be improved.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a method and a device for laser shock strengthening welding parts in an ultra-low temperature environment. Background technique [0002] With the popularization and application of liquefied natural gas (LNG), the demand for the construction of new LNG facilities is also increasing. Among them, the skid-mounted LNG filling station has attracted much attention due to its advantages of small footprint, small investment, quick station construction and easy overall relocation. In the key technical components of the skid-mounted LNG filling station, the key technology of the welding process in the ultra-low temperature environment such as storage tanks, cryopumps, and pipelines has led to shortcomings such as short non-destructive storage time in the LNG filling station. Moreover, at very low working temperature, the weldment is prone to vicious brittle fracture accidents. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50
Inventor 鲁金忠殷劲松张磊罗开玉戴峰泽钟金杉王庆伟齐晗
Owner ZHANGJIAGANG FURUI SPECIAL EQUIP CO LTD
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