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Method for repairing 7-series aluminum alloy through small-spot laser additive under atmosphere protection condition

A repair method and laser additive technology, applied in additive processing, process efficiency improvement, additive manufacturing, etc., to achieve the effects of improving laser energy absorption, strengthening metallurgical bonding, and reducing reflections

Active Publication Date: 2022-05-17
CRRC IND INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Aiming at the problem of pores and crack defects in the process of repairing 7-series aluminum alloys by using aluminum-magnesium-scandium-zirconium-aluminum alloy special powder laser additive materials, the present invention provides a method for repairing 7-series aluminum alloys by using small-spot mode laser additive materials under the protection of an inert atmosphere. aluminum alloy process

Method used

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  • Method for repairing 7-series aluminum alloy through small-spot laser additive under atmosphere protection condition
  • Method for repairing 7-series aluminum alloy through small-spot laser additive under atmosphere protection condition
  • Method for repairing 7-series aluminum alloy through small-spot laser additive under atmosphere protection condition

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Embodiment 1

[0045] This embodiment provides a method for repairing a 7-series high-strength aluminum alloy plate by using Al-Mg-Sc-Zr high-strength aluminum alloy powder as a repair material and using a laser additive repair technology. The repair process uses small light spots and atmosphere protection, and repairs the aluminum alloy prefabricated grooves.

[0046] Specific steps are as follows:

[0047] (1) The 7B05 aluminum alloy plate was selected as the base material, and the specific composition of the base material is shown in Table 1. The V-shaped groove is processed on the substrate by wire cutting, machining, etc. The groove angle is 90°~120°, and the depth is 1~8mm (this depth can cover most of the existing aluminum alloy damage depth).

[0048] The cladding material is aluminum-magnesium-scandium-zirconium-aluminum alloy spherical powder with a particle diameter of 50-120 μm;

[0049] The composition of aluminum-magnesium-scandium-zirconium-aluminum alloy is shown in Table 1...

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Abstract

The invention relates to the technical field of aluminum alloy material additive repairing, in particular to a method for repairing 7-series aluminum alloy through small-spot laser additive under the atmosphere protection condition. According to the laser additive repairing method for the 7-series aluminum alloy, powder special for the aluminum-magnesium-scandium-zirconium-aluminum alloy serves as a repairing material, and repairing is conducted in an inert atmosphere in a small light spot mode. By controlling technological parameters such as laser power, powder feeding amount, scanning speed and powder carrying gas flow, interfaces of a repairing area and a base material area are completely metallurgically bonded, the quality is good, defects such as remarkable air holes and cracks do not exist in the repairing area, the density of the repairing area is larger than or equal to 99.9%, and the room-temperature tensile property of a laser repairing sample can reach 100% or above of the mechanical property of base metal; and the common problems of air holes, cracks and the like in the laser repairing process of the aluminum alloy are solved to a great extent.

Description

technical field [0001] The invention belongs to the technical field of additive repair of aluminum alloy materials, and in particular relates to a method for repairing 7-series aluminum alloys by small spot laser additive repair under the condition of atmosphere protection. Background technique [0002] Aluminum alloy stands out among the many materials because of its light weight, excellent formability, high strength, good plasticity, impact resistance, corrosion resistance, good sealing and high recycling rate. It is very popular in aerospace, rail transit and other industrial fields. . Especially in the manufacture of rail transit equipment, the continuous increase of the aluminization rate is the most effective method to realize the large-scale and wide-body profiles and reduce the weight of the car body. [0003] However, with the increase of train speed and the increase of service life, the damage of aluminum alloy car body parts (such as fatigue cracks, wear, erosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/25B22F10/36B22F7/06C22C21/08B33Y10/00B33Y70/00
CPCB22F10/25B22F10/36B22F7/062C22C21/08B33Y10/00B33Y70/00B22F2007/068Y02P10/25
Inventor 折洁祝弘滨任欣王行涛李明高刘昱赵明元龚明
Owner CRRC IND INST CO LTD
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